All Tools

Browse all 1046 free calculators and tools on Calculator4Everyone.

Hash Generator — Hash Generator computes SHA-1, SHA-256, SHA-384, and SHA-512 hashes for any text you enter. Type or paste the
.htaccess Generator — The .htaccess Generator creates a ready-to-use Apache configuration file from the options you select. Use it t
Packing List Generator — Build a complete packing list in seconds for any trip. Choose the trip type, the number of days, and the expec
Currency Converter — Convert between major world currencies with the Currency Converter. Enter an amount, choose the source and tar
CSS Validator — CSS Validator is a free browser-based tool that checks your CSS code for syntax errors and common style issues
Contrast Ratio Checker — The Contrast Ratio Checker compares a text color and a background color and reports the WCAG contrast ratio to
SSL Certificate Checker — Inspect the live TLS certificate of any domain: issuer, subject, serial, validity, days remaining, hostname ma
CSV to JSON Converter — CSV to JSON Converter turns comma-separated tabular data into JSON. Paste your CSV, switch on Pretty print if
CSS Variable Generator — CSS Variable Generator creates CSS custom properties (variables) for your theme in seconds. Enter a selector,
HTML Boilerplate Generator — The HTML Boilerplate Generator produces a clean HTML5 document skeleton that you can use to start a new projec
API Key Generator — The API Key Generator creates secure random keys for APIs, tokens, and integrations. Set the key length up to
Egypt Electricity Bill Calculator — This tool calculates your monthly electricity bill in Egypt using the official tiered tariff system. Enter you
Font Size Scaler — Font Size Scaler converts font sizes between px, rem, em, pt, and percent with a live preview. Choose the From
Color Converter — The Color Converter translates color values between the three formats web designers use most: HEX, RGB, and HS
Base64 Encoder/Decoder — The Base64 Encoder/Decoder converts text to Base64 and back, and can turn an uploaded file into a Base64 strin
CSS Box Shadow Generator — The CSS Box Shadow Generator lets you design a box shadow visually and copies the ready-to-use CSS declaration
MX Record Checker Guide — The MX Record Checker Guide explains how to look up the mail exchanger (MX) records of any domain and how to i
JSON to CSV Converter — The JSON to CSV Converter transforms a JSON array of objects into a CSV table that you can open in any spreads
.gitignore Generator — .gitignore Generator builds a .gitignore file tailored to your technology stack. Select one or more technologi
CSS Minifier — The CSS Minifier compresses stylesheets by removing comments, whitespace, and extra spaces around punctuation,
Password Generator — The Password Generator creates strong random passwords that you can customize to fit any account or security p
Port Checker Guide — The Port Checker Guide shows you how to verify whether a network port on a host or IP address is open or close
JWT Decoder — The JWT Decoder splits any JSON Web Token into its header, payload, and signature parts and displays the decod
AI Prompt Enhancer — The AI Prompt Enhancer turns a short, plain request into a structured prompt you can use with any AI assistant
CSS Flexbox Generator — The CSS Flexbox Generator builds a flex container visually and outputs the ready-to-use CSS. Choose the main d
HTTP Status Codes Reference — Look up HTTP status codes with plain-language descriptions, or view the full list by class: 1xx informational,
Excel to HTML Table Converter — Excel to HTML Table Converter takes tabular data copied from a spreadsheet and generates ready-to-use HTML tab
CSS Reset Generator — The CSS Reset Generator produces a stylesheet that normalizes default browser styling so elements look consist
Email Validator — Validate any email address and check whether it follows the standard format. The Email Validator checks the ad
Code Minifier & Beautifier — The Code Minifier & Beautifier compresses CSS and JavaScript by stripping comments, whitespace, and redundant
Number Base Converter — The Number Base Converter translates a number from one base to binary, octal, decimal, and hexadecimal at the
Base64 Encode & Decode — The Base64 Encode & Decode tool converts plain text to Base64 and converts Base64 back to plain text instantly
HTML Minifier — The HTML Minifier reduces the size of your HTML code by stripping comments and collapsing whitespace, includin
Email Template Generator — Email Template Generator builds ready-to-use HTML email templates in seconds. Choose an Email Type such as Wel
Cron Expression Generator — The Cron Expression Generator builds standard five-field cron expressions for scheduled tasks and explains wha
Base64 URL Encoder — The Base64 URL Encoder converts plain text into URL-safe Base64 and decodes URL-safe Base64 back into readable
DMS to DD Coordinates — DMS to DD Coordinates converts between degrees-minutes-seconds (DMS) and decimal degrees (DD) in both directio
WHOIS Checker Guide — WHOIS Checker Guide shows you how to look up domain registration information through terminal commands and fre
IPv4 to IPv6 Converter — The IPv4 to IPv6 Converter translates a standard IPv4 address such as 192.168.1.1 into the IPv4-mapped IPv6 no
CSS Gradient Generator — CSS Gradient Generator creates linear and radial CSS gradients with a live preview. Choose Color 1 and Color 2
CSS Gradient Generator — The CSS Gradient Generator builds linear and radial gradients visually and copies the ready-to-use CSS. Choose
Percentage Calculator — The Percentage Calculator answers the five most common percentage questions with two values, A and B: what per
IP Subnet Calculator — The IP Subnet Calculator takes an IPv4 address and a CIDR prefix and computes the network address, subnet mask
Exchange Rate Calculator — The Exchange Rate Calculator converts amounts between currencies using reference rates and applies an optional
Specific Heat Calculator — Specific Heat Calculator solves the heat equation Q = mcΔT for any one of its four variables. Choose whether t
URL Text Scraper — URL Text Scraper helps you pull the readable text out of a web page so you can focus on the actual article or
Punnett Square Calculator — The Punnett Square Calculator builds a genetic cross square from the parental genotypes and shows every possib
JSON Validator & Formatter — The JSON Validator and Formatter checks whether your JSON follows valid syntax and helps you fix it when it do
World Clock — World Clock shows your current local time on screen and updates it every second. The live display includes the
URL Parser — URL Parser takes any web address and splits it into its building blocks: protocol, hostname, port, pathname, s
Concrete Pour Calculator — Estimate the concrete volume for a slab or pour from its length, width, and thickness. Enter the three dimensi
Mock JSON Generator — The Mock JSON Generator turns a small JSON schema into realistic sample data in one click. Use it when you are
DNS Lookup Guide — Generate the exact nslookup, dig, and host commands for any record type — A, AAAA, MX, CNAME, TXT, NS, PTR, SO
DNA to mRNA & Amino Acid Converter — The DNA to mRNA & Amino Acid Converter transcribes a DNA template into messenger RNA and then translates the r
BTU Calculator — The BTU Calculator estimates the cooling capacity a room needs, using length and width in feet plus the room's
Zakat Calculator — The Zakat Calculator works out the Zakat due on your eligible wealth at the standard 2.5% rate. Add your zakat
Test Data Generator — Test Data Generator is a free browser tool that creates realistic JSON sample data for development and testing
CORS Guide & Checker — Understand, test, and fix Cross-Origin Resource Sharing (CORS) problems in web development. Enter an API URL a
URL Extractor — URL Extractor scans any HTML code you paste and pulls out every href and src link into a single organized list
Path & URL Encoder — The Path & URL Encoder converts special characters in URLs, paths, and query strings into safe percent-encoded
UTF HTML Entity Converter — UTF HTML Entity Converter is a free browser tool that turns text into HTML entities and restores entities back
Security Headers Checker — Read the real security headers a website sends — fetched through this site's own server. For each header you s
Link Extractor — The Link Extractor scans any HTML snippet and lists every link it finds in href attributes and every resource
Fuel Consumption Calculator — This tool calculates your vehicle's fuel consumption and the cost of a specific trip. Enter the distance drive
Tire Size Calculator — Calculate the dimensions of a tire from its size markings. Enter the tire width in millimeters, the aspect rat
HTTP Header Checker — Check and analyze the HTTP headers returned by any website. Enter a URL, press Check, and review the response
Regex Tester — The Regex Tester checks a regular expression against a sample text and highlights every match in the output. U
Open Graph Generator — The Open Graph Generator creates Open Graph meta tags that control how your page looks when shared on social m
Meta Tag Generator — The Meta Tag Generator creates ready-to-use HTML meta tags for your website from a few simple fields. Fill in
JSON Formatter — The JSON Formatter cleans up your JSON in three ways: it validates the input, formats it with readable indenta
HTML Validator — The HTML Validator checks your markup for the most common structural problems before you deploy it. It flags a
Date Difference Calculator — The Date Difference Calculator measures the time between two dates and reports it in several units at once: da
Airflow Calculator — The Airflow Calculator works out how much fresh air a room needs per hour, reported in CFM (cubic feet per min
Electricity Cost Calculator — This tool calculates how much an appliance or home load costs to run in electricity. Enter the power rating in
Column Load Capacity Calculator — The Column Load Capacity Calculator estimates the nominal strength (Pn) and the design strength (Pu = 0.65Pn)
User Agent Parser — User Agent Parser reads the User Agent string your browser or app sends with every request and identifies the
CPA Calculator — The CPA Calculator tells you how much each new customer or conversion really costs. Enter your total ad spend
Speed Converter — The Speed Converter changes speed values between units such as kilometres per hour, miles per hour, metres per
SPF & DKIM Guide — The SPF/DKIM/DMARC Guide helps you verify and configure the email authentication records that protect a domain
Regex Generator — The Regex Generator provides ready-to-use regular expressions for common cases such as email, URL, phone numbe
Ping Tool Guide — The Ping Tool Guide explains how to test network connectivity and response time by sending ICMP packets to a h
OCR Web Tool — The OCR Web Tool extracts text from images, screenshots, and scanned documents so you can copy and edit it. Us
Spring Constant Calculator — Spring Constant Calculator finds the stiffness of a spring using Hooke's law k = F/x. Enter the applied force
Hijri to Gregorian Date Converter — Convert dates between the Hijri and Gregorian calendars in both directions with the Hijri to Gregorian Date Co
Galvanic Cell EMF Calculator — The Galvanic Cell EMF Calculator computes the electromotive force of a cell by adding the anode oxidation pote
Professional Calculator — The Professional Calculator is a full-featured scientific calculator with keyboard support, a visible calculat
Food Storage Calculator — The Food Storage Calculator shows how long common foods can stay in the refrigerator before they should be eat
One-Sample T-Test — The One-Sample T-Test determines whether the mean of your sample differs significantly from a hypothesized val
Calories Burned — The Calories Burned tool estimates how many calories you burn during an activity using standard MET values. It
Roofing Calculator — The Roofing Calculator estimates the number of roofing shingle bundles needed for a pitched roof. Enter the ro
Robots.txt Generator — The Robots.txt Generator creates a robots.txt file that tells search engines which parts of your site they may
Merge PDF — Merge PDF combines multiple PDF files into one document in your browser. You add at least two PDFs, reorder th
JavaScript Minifier — The JavaScript Minifier shrinks your JS files by removing line and block comments, collapsing repeated whitesp
IP Lookup — The IP Lookup tool reveals the geographical and network details behind any IP address, including city, region,
Break-Even Calculator — The Break-Even Calculator tells you how many units you must sell to cover your fixed and variable costs, and t
Food Waste Calculator — The Food Waste Calculator estimates how much food you throw away and what it is worth. Enter the weekly waste
Shoe Size Converter — The Shoe Size Converter turns a foot length measured in centimetres into the matching shoe sizes for several i
YAML Formatter — YAML Formatter is a free browser tool that tidies up YAML configuration files and converts between YAML and JS
Markdown to HTML — Convert Markdown into clean HTML with a live preview beside your editing area. Write headings, bold text, list
Software License Generator — The Software License Generator builds a complete license text from a short set of fields: the license type, th
Home Energy Audit — This tool gives your home a quick energy efficiency audit. Rate five areas of your home, heating, cooling and
Energy Efficiency Rating — This tool rates the energy efficiency of a building by converting its annual energy use into an Energy Use Int
Caesar Cipher — Encrypt and decrypt text using the classical Caesar cipher right in your browser. Choose Encode or Decode mode
Bandwidth Calculator — The Bandwidth Calculator estimates how many concurrent users an internet connection can support based on conne
Net Floor Area — The Net Floor Area Calculator computes the usable floor area of a building by subtracting columns, openings (l
Pressure Units Converter — The Pressure Units Converter changes between common pressure units such as kilograms per square centimetre (kg
Unit Converter — Convert values between many measurement categories including length, weight, and volume with this all-in-one u
Roman Numerals Converter — The Roman Numerals Converter changes standard numbers between 1 and 3999 into Roman numerals and turns valid R
Project Timeline Calculator — Plan project delivery dates with the Project Timeline Calculator. Add tasks with a name and duration, set an o
JSON API Tester — The JSON API Tester lets you call an API endpoint directly from your browser. Choose a method, enter the URL,
All-in-One Unit Converter — The All-in-One Unit Converter translates a value from one unit to another across many measurement categories,
Age Calculator — The Age Calculator computes your exact age in years, months, and days between a birth date and a target date.
Compost Calculator — The Compost Calculator balances a compost pile by comparing the amounts of green and brown materials you add.
Cooking Time Adjuster — The Cooking Time Adjuster estimates the new cooking time when the weight of your food changes. Enter the origi
Restriction Digest Calculator — The Restriction Digest Calculator works out how many enzyme units and what enzyme volume you need to cut a giv
Respiratory Quotient Calculator — The Respiratory Quotient Calculator divides the amount of carbon dioxide produced by the amount of oxygen cons
TDEE Calculator — TDEE Calculator estimates your total daily energy expenditure in calories using the Mifflin-St Jeor equation.
Website Speed Guide — Get the measurement tools and performance targets that matter: Core Web Vitals (LCP, INP, CLS), secondary metr
Archimedes Principle Calculator — The Archimedes Principle Calculator computes the buoyant force acting on an object submerged in a fluid. Enter
GPA Calculator — Calculate your cumulative GPA on a 4.0 scale. Add each course with its letter grade and credit hours, and the
Blood Type Inheritance Calculator — Blood Type Inheritance Calculator shows the possible blood types of children from the blood types of the mothe
Effective Population Size Calculator — The Effective Population Size Calculator computes the effective population size Ne from the numbers of breedin
Empirical Formula Calculator — The Empirical Formula Calculator works out the simplest whole-number ratio of atoms in a compound from the mas
Meeting Planner — Meeting Planner converts a proposed meeting date and time in your timezone into the local time for major world
Love Calculator — The Love Calculator gives a playful compatibility percentage between two names based on their letters. It is e
Text to Barcode Binary Converter — Text to Barcode Binary Converter turns any text into several representations at once: UTF-8 bytes, 8-bit binar
Workload Balancer — Check whether your week is realistically staffed with the Workload Balancer. Set your weekly capacity in hours
Time Unit Converter — Convert values between seconds, minutes, hours, days, and weeks with this fast online time unit converter. It
SSL/TLS Configuration Guide — Grab ready-to-use SSL/TLS presets for Nginx, Apache, Node.js, Caddy, and HAProxy, switch to a TLS version and
Random Number Generator — The Random Number Generator produces one or more random whole numbers inside a range that you define, with an
Prime Number Checker & Generator — The Prime Number Checker & Generator combines a primality test with a prime listing tool. Check any positive i
Pomodoro Timer — The Pomodoro Timer applies the Pomodoro technique: focused work sessions separated by short breaks. Set your w
pH & pOH Calculator — The pH & pOH Calculator converts between pH and hydrogen-ion concentration [H+] and labels the solution as aci
PDF to Image — PDF to Image turns every page of a PDF into a high-quality PNG or JPG image. You choose a resolution scale bet
Optics Magnification Calculator — Optics Magnification Calculator computes the magnification produced by lenses and mirrors. It works from eithe
E-commerce Fee Calculator — The E-commerce Fee Calculator estimates the marketplace fee on a product and the net earnings you keep. It com
Cell Division Exponential Calculator — The Cell Division Exponential Calculator estimates how many cells a culture produces after a series of mitotic
Moving Boxes Calculator — The Moving Boxes Calculator estimates how many medium moving boxes you need for a move. Enter your goods volum
Room Lighting Calculator — The Room Lighting Calculator tells you how much light a room needs and how many bulbs will deliver it. Enter t
Furniture Space Calculator — The Furniture Space Calculator compares your furniture footprint with the room area and reports the occupancy
Concrete Blocks Calculator — The Concrete Blocks Calculator estimates the number of concrete blocks required for a wall, including a 5% was
Coefficient of Variation — The Coefficient of Variation Calculator expresses how spread out a dataset is relative to its mean. Enter at l
Body Type Calculator — The Body Type Calculator measures your waist-to-hip ratio (WHR) to describe your fat distribution pattern and
Kaffarah Food Volume Converter — The Kaffarah Food Volume Converter works with the Islamic volume measures used in expiation (kaffarah) obligat
Seed Planting Calculator — Plan how many seeds you need for your garden bed. Enter the planting area, row spacing, plant spacing, seeds p
Moon Phases Calculator — The Moon Phases Calculator shows the moon's phase for any date you choose. Select a date and the tool returns
Henderson-Hasselbalch Calculator — The Henderson-Hasselbalch Calculator estimates the pH of a buffer solution using the Henderson-Hasselbalch equ
Torque & Horsepower Converter — Convert torque between units and estimate horsepower from torque and engine speed with this torque and horsepo
pOH Calculator — The pOH Calculator computes the pOH of a solution from its hydroxide-ion concentration [OH-] using pOH = -log1
Refractive Index Calculator — Refractive Index Calculator determines the refractive index of a medium either from the speed of light in it o
CTR Calculator — The CTR Calculator works out your click-through rate from clicks and impressions. Enter the number of clicks y
URL Length Checker — The URL Length Checker tells you whether a URL's character count falls within an acceptable limit. Enter the U
Storage Box Calculator — The Storage Box Calculator tells you how many boxes fit in a storage space. Enter the length and depth of the
Laundry Cost Calculator — The Laundry Cost Calculator estimates the real cost of each laundry load by adding up energy, water, and deter
Shopping List Calculator — The Shopping List Calculator works out the exact quantity of each item you need for a group and what it will a
Words Per Page Calculator — The Words Per Page Calculator estimates how many words fit on one page from your font size and line spacing, a
EV Charging Cost Calculator — The EV Charging Cost Calculator tells you how much it costs to charge an electric vehicle. Enter the energy ne
EV Charging Time Calculator — The EV Charging Time Calculator estimates how long it takes to charge an electric vehicle. Enter the battery c
Pulse Pressure Calculator — The Pulse Pressure Calculator computes pulse pressure by subtracting the diastolic pressure from the systolic
Chromosome Number Calculator — The Chromosome Number Calculator works out chromosome numbers for different ploidy levels. You enter the basic
Population Growth Calculator — The Population Growth Calculator projects the size of a population after exponential growth over time. Enter t
Project Progress Calculator — The Project Progress Calculator shows how much of a project is finished. Enter the completed work and the tota
Linear Equation Solver — The Linear Equation Solver finds the exact solution of a system of two linear equations in two unknowns using
Word Cloud Generator — The Word Cloud Generator turns a block of text into a visual word cloud, sizing each word according to how oft
Paver Calculator — The Paver Calculator works out how many paving units cover a given patio or walkway area. It divides the paved
Photon Energy Calculator — Photon Energy Calculator finds the energy of a photon from its frequency or its wavelength using E = h·f = hc/
Power Calculator — Power Calculator computes power from work done and the time taken using P = W / t. Enter the work or energy in
Hours & Wages Calculator — The Hours & Wages Calculator works out your daily, weekly, and monthly working hours. Enter your start time, e
Color Picker & Palette — Pick any color and instantly explore its shades and harmonies. Select a color to see lighter and darker variat
Appliance Energy Usage Calculator — The Appliance Energy Usage Calculator builds a list of household appliances with their wattage and daily runni
API Cost Estimator — The API Cost Estimator estimates how much an API will cost you each month and each year from your request volu
Pool Water Replacement Calculator — The Pool Water Replacement Calculator estimates how long it takes to replace the water in a pool. Enter your p
Car Depreciation Calculator — Estimate how much your car loses in value each year with the Car Depreciation Calculator. Enter the purchase p
DNA Amplification (PCR Copy) Calculator — The DNA Amplification (PCR Copy) Calculator predicts how many copies of a DNA target you obtain after a given
Mortar Calculator — Estimate the mortar, cement bags, and sand needed for a masonry wall. Enter the wall length, height, and thick
Cantilever Beam Deflection — The Cantilever Beam Deflection calculator estimates the end deflection, maximum moment, maximum bending stress
GCF Calculator — GCF Calculator finds the greatest common factor of two or three numbers and checks whether each input divides
Pace Calculator — The Pace Calculator converts a distance and a running time into speed in km/h, pace per kilometer, and project
Triangle Calculator — Calculate the area, perimeter, and angles of a triangle from its three side lengths. The Triangle Calculator u
Pregnancy Weight Gain — Pregnancy Weight Gain is a health tool that helps expectant mothers plan a healthy weight gain. Enter your pre
Mean Median Mode Range — The Mean Median Mode Range Calculator computes the four key summary measures of a dataset in one step. Enter a
Percent Error Calculator — The Percent Error Calculator measures how close an experimental result is to the true value. You enter the mea
Cylindrical Column Concrete — The Cylindrical Column Concrete calculator finds the concrete volume of one circular column and the total volu
Projectile Motion Calculator — Projectile Motion Calculator computes the range, maximum height, and time of flight of an object launched with
Pregnancy Week Calculator — The Pregnancy Week Calculator shows your current pregnancy week, trimester, and estimated due date from the fi
Kinematics Calculator — The Kinematics Calculator solves straight-line motion problems under constant acceleration using the standard
GCD & LCM Calculator — GCD & LCM Calculator computes the greatest common divisor (GCD) and the least common multiple (LCM) of two or
Baking Ingredient Converter — Convert baking ingredients between weight and volume with this ingredient converter. It handles grams, cups, t
Dehumidifier Size Calculator — The Dehumidifier Size Calculator recommends the right dehumidifier capacity for a room in pints and litres per
Furniture Clearance Calculator — The Furniture Clearance Calculator checks whether a furniture piece can pass through a doorway. Enter the door
VO2 Max Calculator — The VO2 Max Calculator estimates cardiorespiratory fitness from just two values: your age and your resting hea
Ligation Ratio Calculator — The Ligation Ratio Calculator determines the insert DNA mass needed to ligate an insert into a vector at a cho
Nitrogen Balance Calculator — The Nitrogen Balance Calculator estimates daily nitrogen balance from protein intake and urinary urea nitrogen
X-Linked Inheritance Calculator — The X-Linked Inheritance Calculator works out the probability that children inherit an X-linked recessive trai
Wire Size Calculator — The Wire Size Calculator finds the conductor cross-section needed to keep voltage drop within an allowable per
Stair Riser & Tread Calculator — The Stair Riser & Tread Calculator checks the comfort and geometry of an existing or planned stair. Enter the
Wind Chill Heat Index Dew Point — This weather tool computes three comfort indices at once. Enter air temperature in Celsius, relative humidity,
Gravel Calculator — Estimate how much gravel you need for any area. Enter the length and width in meters, the depth in centimeters
Nernst Equation Calculator — The Nernst Equation Calculator finds the cell potential E of an electrochemical cell under non-standard condit
ROT13 Encoder — ROT13 Encoder is a free browser-based tool that shifts every letter in your text 13 positions forward in the a
Resume Bullet Generator — Create strong resume bullet points in seconds with the Resume Bullet Generator. Choose an action verb, describ
Redirect Checker Guide — The Redirect Checker Guide explains how to check the redirect chain of any URL and identify its final destinat
Recipe Converter — Scale any recipe up or down to the number of servings you need. Enter each ingredient name, its original amoun
Compaction Calculator — Convert wet density to dry density using the soil moisture content. Enter the wet density and the water conten
Potential Energy Calculator — Potential Energy Calculator computes gravitational potential energy from mass, height, and gravitational accel
pH Calculator — The pH Calculator converts between hydrogen-ion concentration [H+] and pH, and classifies a solution as acidic
Password Strength Checker — Check how strong your password really is with an interactive security test. The tool scores your password agai
Ovulation Calculator — The Ovulation Calculator estimates your expected ovulation day, fertile window, and next period from your last
List Merger & Sorter — Combine two lists into one clean, alphabetically sorted list with no duplicates. Paste a list into each field,
HTML Encoder/Decoder — Convert HTML special characters into safe entities and back again. Encode a string so it displays as code inst
Event Countdown Timer — Count down the time remaining until an event by picking its date and time. The tool shows how many days, hours
Discount Calculator — The Discount Calculator works out the discount amount, the final price, and your savings for any offer. It sup
Decision Matrix — Score your options against weighted criteria to compare them systematically. Add options and criteria, assign
Color Palette Generator — Build a harmonious five-color palette from any base color in one click. Pick your base color, choose a palette
Acid-Base Titration Calculator — Solve acid-base titration problems without paper math with the Acid-Base Titration Calculator. It works from t
Rest Time Calculator — The Rest Time Calculator recommends how long you should rest between sets, based on your training goal and the
Party Food Calculator — The Party Food Calculator takes the guesswork out of catering for a gathering. Enter your number of guests and
Screen PPI Calculator — The Screen PPI Calculator computes a screen's pixel density from its width, height, and diagonal size, along w
Salt Percentage Calculator — The Salt Percentage Calculator converts a target salt percentage into an actual amount for your recipe. Enter
Ceiling Fan Size Calculator — The Ceiling Fan Size Calculator recommends the right ceiling fan diameter for a room from its length and width
Stroke Volume Calculator — The Stroke Volume Calculator works out stroke volume (SV) from the end-diastolic and end-systolic volumes of t
Amino Acid Count Calculator — Amino Acid Count Calculator counts how often each amino acid appears in a one-letter protein sequence and show
Biodiversity Index Calculator — Biodiversity Index Calculator computes common diversity measures from a comma-separated list of species abunda
Transpiration Rate Calculator — The Transpiration Rate Calculator works out how quickly a plant loses water through transpiration. Enter the w
Blood Flow Resistance Calculator — Blood Flow Resistance Calculator estimates the resistance to blood flow in a vessel from the pressure differen
Limiting Reagent Calculator — Determine the limiting reagent in a two-reactant chemical reaction by entering the mass (g), molar mass (g/mol
Zakat Nisab Converter — Find the monetary value of the Zakat nisab using current gold and silver prices. Enter the price per gram of g
Payback Period Calculator — The Payback Period Calculator works out how long an investment takes to recover its initial cost from annual c
Right Triangle Calculator — The Right Triangle Calculator finds the hypotenuse, area, and both acute angles of a right triangle from the t
Quadratic Formula Calculator — The Quadratic Formula Calculator takes the coefficients a, b, and c of a quadratic equation and returns the di
Sunrise Sunset Calculator — The Sunrise Sunset Calculator tells you when the sun rises and sets at any location on any date. Enter the dat
Trigonometry Calculator — Calculate sine, cosine, tangent, and their inverse functions for any angle in degrees or radians. The Trigonom
Tax Bracket Calculator — The Tax Bracket Calculator works out income tax under a progressive bracket system. Enter your annual income a
Statistics Calculator — The Statistics Calculator summarizes a list of numbers by computing the mean, median, mode, standard deviation
LED Power Calculator — The LED Power Calculator computes the electrical power consumed by an LED circuit. Enter the voltage across th
Radioactive Decay & Half-Life Calculator — Radioactive Decay & Half-Life Calculator finds how much of a radioactive sample remains after a given time, an
Pythagorean Theorem Calculator — The Pythagorean Theorem Calculator finds the hypotenuse of a right triangle when you know the lengths of its t
One Rep Max Calculator — The One Rep Max Calculator works out your one-repetition maximum from the weight you lift and the number of re
Logarithm Calculator — The Logarithm Calculator evaluates the logarithm of a positive number in any base. You can pick a preset base
Invoice Generator — The Invoice Generator lets you build a professional printable invoice by adding line items with quantity, unit
Image to PDF — Image to PDF converts one or more images into a PDF file right in your browser. It supports common formats lik
Ideal Gas Law Calculator — Solve any unknown in the ideal gas law PV = nRT by choosing the quantity to find — pressure P (Pa), volume V (
Geometry Calculator — Geometry Calculator computes the perimeter, area, and volume of five common shapes: circle, rectangle, triangl
Focus Mode Timer — Run focused work sessions with a countdown timer set to 15, 25, 45, or 60 minutes. Type what you will focus on
Equivalent Resistance Calculator — The Equivalent Resistance Calculator finds the total resistance of up to four resistors connected in series or
Baby Name Generator — The Baby Name Generator suggests baby names based on the gender and origin you choose. Pick Boy or Girl, selec
Final Grade Calculator — The Final Grade Calculator shows what score you need on a remaining exam to reach a target final grade. Enter
Curtain Size Calculator — The Curtain Size Calculator works out the curtain width and length you need from your window and rod measureme
Price Per 100g Calculator — The Price Per 100g Calculator converts a product's total price and package weight into the cost per 100 grams,
Price Per Unit Calculator — The Price Per Unit Calculator works out the cost of a single piece from the pack price and the number of piece
Workout Volume Calculator — The Workout Volume Calculator measures the total training volume of an exercise from its sets, reps, and weigh
Grade Improvement Calculator — The Grade Improvement Calculator determines the grade you need on your next assessment to reach a target avera
Greenhouse Heating Calculator — The Greenhouse Heating Calculator estimates the heating power needed to keep a greenhouse at the desired tempe
Shower Water Usage Calculator — The Shower Water Usage Calculator estimates how much water your shower routine uses. Enter the shower-head flo
Fan Electricity Cost Calculator — The Fan Electricity Cost Calculator works out the monthly running cost of any fan. Enter the fan power in watt
Mean Arterial Pressure Calculator — The Mean Arterial Pressure Calculator finds MAP from the systolic and diastolic pressures you enter in mmHg. I
Formwork Area Calculator — Estimate the formwork area and plywood sheets needed for concrete elements. Enter the element length, width, t
LCM Calculator — The LCM Calculator finds the least common multiple of two or three numbers in one step and lists the first 4 m
Body Surface Area — The Body Surface Area tool calculates BSA using the Mosteller and Du Bois formulas, along with your Body Mass
Target Heart Rate — Target Heart Rate helps you train in the right intensity zone. Enter your age and your resting heart rate, and
Exponent Calculator — Exponent Calculator raises a base number to a power and also displays the result in scientific notation. It ha
Time Card Calculator — Track pay for a shift with the Time Card Calculator. Enter a start time, an end time, a break in minutes, and
Retirement Calculator — The Retirement Calculator projects your savings between now and retirement using monthly compounding, then app
Confidence Interval Calculator — The Confidence Interval Calculator builds a confidence interval around a sample mean when the population stand
Scientific Notation Calculator — The Scientific Notation Calculator takes a coefficient (mantissa) and a decimal exponent and returns the full
Word Counter — Word Counter counts words, characters, characters without spaces, sentences, and paragraphs in any text, plus
Sleep Calculator — Sleep Calculator helps you plan bedtimes and wake times around 90-minute sleep cycles. Choose a mode: enter a
QR Code Generator — QR Code Generator creates a QR code from any text or URL you enter. You can set the image size, generate the c
Backfill Calculator — Determine the volume of backfill material needed around a structure or in a trench. Enter the excavation volum
Prime Number Checker — The Prime Number Checker tells you whether a positive integer is prime and shows its prime factorization. It a
Concrete Curb Calculator — Calculate the volume of concrete needed for a curb or kerb. Enter the length, width, and height in consistent
Payroll Calculator — The Payroll Calculator converts a gross salary into take-home pay by subtracting income tax and social insuran
Electrical Ohm's Law Calculator — The Electrical Ohm's Law Calculator works out voltage, current, resistance, and power from any two known value
Numbers to Words Converter — The Numbers to Words Converter turns numeric values into their written form, which is useful for the amount li
Markup Calculator — The Markup Calculator works in two directions. From a cost and a markup percent it computes the selling price,
Lorem Ipsum Generator — Create ready-made Lorem Ipsum placeholder text for designs, mockups, and layouts. Choose paragraphs, sentences
Solubility Product Ksp Calculator — Calculate the solubility product Ksp from the molar solubility X, or find X from Ksp, for binary salts (AB), t
Image Resizer — Resize any image to the exact pixel dimensions you need while keeping its proportions. Upload a picture, set t
Hourly Rate Calculator — The Hourly Rate Calculator converts an annual salary into the equivalent hourly, daily, and weekly rates. Ente
Find and Replace Tool — Find any word or phrase and replace every occurrence of it throughout your text at once. Enter the text, the s
Engagement Rate Calculator — The Engagement Rate Calculator measures how actively your audience interacts with your content. Enter your fol
Daily Calorie Needs Calculator — The Daily Calorie Needs Calculator estimates your daily energy requirements using the Mifflin-St Jeor equation
Citation Generator — The Citation Generator builds correctly formatted academic references in APA, MLA, and Chicago styles. Choose
Base64 Image Converter — Turn any image into a Base64 data URI so you can embed it directly in HTML, CSS, or JSON without a separate fi
Appliance Energy Calculator — The Appliance Energy Calculator estimates the energy an appliance consumes in kilowatt-hours from its power ra
Acceleration Calculator — Acceleration Calculator solves uniform acceleration problems using the kinematic equation a = (vf - v0) / t. P
Cooking Unit Converter — The Cooking Unit Converter switches between cups, tablespoons, teaspoons, millilitres, and grams for common in
Upload Time Calculator — The Upload Time Calculator estimates how long it takes to upload a file based on its size and your connection'
Weighted Grade Calculator — The Weighted Grade Calculator computes your weighted average from three component grades and percentage weight
Yeast Conversion Calculator — The Yeast Conversion Calculator swaps a yeast amount between instant, active dry, and fresh yeast. Enter the a
Website Bandwidth Calculator — The Website Bandwidth Calculator estimates how much data your website transfers each month. Enter the average
Car Trip Cost Calculator — The Car Trip Cost Calculator estimates the full cost of a road trip by car. Enter the distance, fuel consumpti
Tire Pressure Calculator — Adjust your tire pressure correctly when the seasons change with the Tire Pressure Calculator. Enter the recom
Parking Space Size Calculator — Check whether your car will fit a parking spot before you try to park with the Parking Space Size Calculator.
DNA Complement Calculator — The DNA Complement Calculator produces the complementary strand and the reverse complement of a DNA sequence y
Hardy-Weinberg Equilibrium Calculator — The Hardy-Weinberg Equilibrium Calculator derives the allele and genotype frequencies of a population from the
Inductor Energy Calculator — The Inductor Energy Calculator finds the energy stored in an inductor from its inductance and the current flow
Percentile Calculator — The Percentile Calculator finds the value that sits at any percentile of your dataset, along with its approxim
Roof Pitch Calculator — The Roof Pitch Calculator converts your roof's vertical rise and horizontal run into the pitch percentage, pit
One Rep Max — The One Rep Max tool estimates your one-repetition maximum from the weight you lift and the number of reps you
GDP Calculator — The GDP Calculator computes Gross Domestic Product using the standard expenditure approach. Enter consumption,
Root Calculator — The Root Calculator computes the nth root of any non-negative number together with its square root and cube ro
Stair Calculator — The Stair Calculator helps you lay out a flight of stairs from the total rise, riser height, and tread depth.
Rounding Calculator — The Rounding Calculator rounds any number half-up to the decimal places you choose and also shows it rounded t
Islamic Weight Converter — The Islamic Weight Converter converts traditional Islamic weight units - Qirat, Dirham, Islamic dinar, Mithqal
Long Division Calculator — The Long Division Calculator divides a dividend by a divisor and reports three results: the integer quotient (
Velocity Calculator — Velocity Calculator solves the motion equation v = d/t for any one of its three variables. Choose whether to f
Unit Price Comparator — The Unit Price Comparator compares products by price per gram, millilitre, or unit instead of the total packag
Timestamp Converter — Timestamp Converter is a free browser tool that converts Unix timestamps into human-readable dates and back ag
Text Reverser — Text Reverser flips your text in three ways: reverse every character, reverse the order of words, or reverse t
Capacitor Charge Calculator — The Capacitor Charge Calculator computes the electric charge stored in a capacitor using the formula Q = C × V
Solar Energy Calculator — The Solar Energy Calculator estimates how much electricity your solar panels will produce every day, month, an
LED Resistor Calculator — The LED Resistor Calculator works out the series resistor needed to limit the current through an LED. Enter th
Reading Time Estimator — Reading Time Estimator tells you exactly how long it takes to read, speak, or skim any article or text. Paste
Secure Password Tool — Generate a strong random password and get a basic strength estimate with the Secure Password Tool. The tool wo
Molality Calculator — Calculate the molality m of a solution by dividing the moles of solute by the mass of solvent in kilograms usi
Molar Mass Calculator — Calculate the molar mass (molecular weight) of any chemical formula such as H2O or H2SO4 by typing the formula
MD5 & SHA-256 Hash Generator — Generate cryptographic hash fingerprints for any text directly in your browser with this free tool. It compute
Green Building Score — This tool scores how sustainable your building is by counting its green features. Tick each feature your build
DNA Concentration Calculator — The DNA Concentration Calculator converts an A260 absorbance reading into a nucleic acid concentration using t
CGPA Calculator — CGPA Calculator is a free browser tool that computes your cumulative grade point average using a standard 4.0
English Case Converter — The English Case Converter transforms English text into the case style you need. Paste or type your text and c
Boolean Algebra Calculator — The Boolean Algebra Calculator builds a truth table from your inputs A, B, and C. Set each variable to 0 or 1,
Audio Bitrate Calculator — The Audio Bitrate Calculator computes the file size of an audio recording from its bitrate and duration, or th
Seed Quantity Calculator — The Seed Quantity Calculator estimates how many seeds you need for a field, accounting for germination losses.
Database Storage Calculator — The Database Storage Calculator estimates the current size of a database from its row count and average row si
Moving Truck Size Calculator — The Moving Truck Size Calculator matches a home size to the recommended moving truck. Pick your home size from
Cell Tonicity Calculator — The Cell Tonicity Calculator compares the solute concentration inside a cell with the concentration of its ext
DNA GC Content Calculator — The DNA GC Content Calculator counts the bases in a pasted DNA sequence and reports the GC and AT percentages.
Logistic Growth Calculator — The Logistic Growth Calculator models how a population grows when it is limited by a carrying capacity K. Ente
Cell Doubling Time Calculator — The Cell Doubling Time Calculator estimates how long a cell population takes to double using the initial cell
DNA Melting Temperature Calculator — The DNA Melting Temperature Calculator estimates the melting temperature Tm of a primer or DNA sequence using
Paint Calculator — The Paint Calculator estimates the amount of paint needed to cover interior or exterior surfaces based on the
Binomial Distribution Calculator — The Binomial Distribution Calculator computes probabilities for a fixed number of independent trials, each wit
Linear Regression Calculator — The Linear Regression Calculator fits a straight line to paired data using the least-squares method. Enter at
Parallel Resistor Calculator — The Parallel Resistor Calculator finds the equivalent resistance of up to four resistors connected in parallel
Online Timer — Online Timer is a countdown timer you set with hours, minutes, and seconds and run directly in the browser. Us
Printable Calendar Generator — Printable Calendar Generator builds a clean monthly calendar for any month and year, aligned to the starting w
GFR Calculator — The GFR Calculator estimates creatinine clearance using the Cockcroft-Gault equation. Enter your age, weight i
IRR Calculator — The IRR Calculator finds the internal rate of return from a comma-separated list of cash flows, where the firs
Rebar Estimator — The Rebar Estimator calculates the weight of reinforcing steel for a construction job. Enter the bar diameter
Water Tank Sizing — Use the Water Tank Sizing tool to find the storage capacity your home needs. Enter the number of people, the a
Rainwater Harvesting — The Rainwater Harvesting calculator estimates how much rainwater a building roof can collect each year and mon
VAT Calculator — The VAT Calculator adds Value Added Tax to a net price or extracts it from a gross price. Choose the calculati
Trip Budget Planner — Plan and allocate your trip budget across the categories that matter. Enter your trip duration, total flight t
Reaction Rate Calculator — The Reaction Rate Calculator estimates the average rate of a chemical reaction from the change in concentratio
Random Picker — The Random Picker selects one item at random from a list you provide. Type each name or option, run the picker
Protein Intake Calculator — Protein Intake Calculator estimates your daily protein needs from your body weight and your fitness goal. Ente
Pressure Calculator — Pressure Calculator solves the pressure equation P = F/A in three ways: pressure, force, or area. Pick the qua
Motional EMF Calculator — The Motional EMF Calculator finds the electromotive force induced in a conductor moving through a magnetic fie
Meeting Agenda Generator — Meeting Agenda Generator turns a meeting title, date, and list of agenda items into a formatted agenda with ru
Hydration Tracker — The Hydration Tracker calculates a daily water goal in milliliters based on your weight, activity level, and c
Heart Rate Zones Calculator — The Heart Rate Zones Calculator estimates your maximum heart rate (220 - age) and five training zones from you
Flow Rate Calculator — The Flow Rate Calculator computes the volumetric flow rate of fluid moving through a pipe or channel using Q =
Faraday's Law of Electrolysis Calculator — The Faraday's Law Calculator computes the mass deposited during electrolysis using m = (I × t × equivalent wei
Equilibrium Constant Kc Calculator — The Equilibrium Constant Kc Calculator finds the equilibrium constant of a reversible reaction from the concen
Energy & Pressure Converter — Convert energy and pressure units in one place with the Energy & Pressure Converter. Switch between joules, ca
Data Size Converter — Convert between bytes, kilobytes, megabytes, gigabytes, and terabytes with the Data Size Converter. Enter a va
Construction Cost per Square Meter — The Construction Cost per Square Meter tool helps you estimate the average building cost per square metre and
Chemical Equation Balancer — The Chemical Equation Balancer balances chemical equations by adjusting the coefficients so that every element
Capacitance Calculator — The Capacitance Calculator applies C = Q/V to find any one of capacitance, charge, or voltage. Select the quan
Business Name Generator — The Business Name Generator creates creative brand name ideas by combining your keyword with common prefixes a
Broken Link Checker — Broken Link Checker is a free browser-based tool that scans text or code for URLs and flags links that may be
Budget Planner — The Budget Planner builds a quick monthly budget from your income and four expense categories: housing, food,
Chemical Bond Type Checker — The Chemical Bond Type Checker classifies the bond between two elements from the difference between their elec
BMI Calculator — The BMI Calculator works out your Body Mass Index from your weight and height and places it in one of four cat
Bill Splitter — The Bill Splitter divides a shared bill and tip evenly among the people in a group, so everyone pays the same
Garden Mulch Calculator — The Garden Mulch Calculator estimates the amount of mulch you need to cover a garden bed. Enter the area in sq
Audio Storage Calculator — The Audio Storage Calculator estimates the size of an audio file from its bitrate and duration, then shows how
Pasta Serving Calculator — The Pasta Serving Calculator tells you how much dry pasta to cook for any group. Enter the number of people, c
Wallpaper Roll Calculator — The Wallpaper Roll Calculator shows how many rolls of wallpaper you need for a room. Enter the wall area in sq
Shipping Weight Calculator — The Shipping Weight Calculator estimates the total weight of a shipment from the item weight, the packaging we
Water Tank Size Calculator — Choose the right water tank size for your home without guesswork. Enter the number of household members, pick
Plant Population Calculator — The Plant Population Calculator estimates how many plants fit in a field based on your spacing plan. Enter the
Water Heater Cost Calculator — Estimate how much energy and money it takes to heat the water in your storage tank. Enter your tank volume, cu
Break-Even Quantity Calculator — The Break-Even Quantity Calculator tells you how many units you must sell to cover your fixed costs. Enter you
Attendance Percentage Calculator — The Attendance Percentage Calculator works out your attendance rate from the days you attended and the total s
Shopping Cart Discount Calculator — The Shopping Cart Discount Calculator shows how much a percentage discount saves on a cart total. Enter the ca
EV Range Calculator — The EV Range Calculator estimates how far an electric vehicle can travel on a single charge. Enter the battery
Vehicle Load Capacity Calculator — Know how much you can still load into your vehicle with the Vehicle Load Capacity Calculator. Enter the vehicl
Fuel Cost Per Kilometer Calculator — The Fuel Cost Per Kilometer Calculator works out how much every kilometre of driving costs in fuel. Enter your
Cell Count After Division Calculator — The Cell Count Calculator estimates the cell concentration of a sample in cells per milliliter from the averag
Cell Viability Calculator — The Cell Viability Calculator finds the percentage of viable cells in a sample from the numbers of live cells
PCR Annealing Temperature Calculator — The PCR Annealing Temperature Calculator estimates the melting temperature (Tm) of your forward and reverse pr
Chi-Square Test — The Chi-Square Test Calculator compares observed and expected counts to test whether data fit a hypothesized d
Weighted Average Calculator — The Weighted Average Calculator finds the average of values when each value carries a different weight. It tak
Covariance Calculator — The Covariance Calculator measures how two variables vary together for both a sample and a population. Enter a
Correlation Coefficient Calculator — The Correlation Coefficient Calculator measures the strength and direction of a linear relationship between tw
Normal Distribution Calculator — Compute the standard score (z) and the tail probabilities for any value x in a normal distribution. Enter the
Asphalt Calculator — The Asphalt Calculator estimates how much asphalt you need for a driveway or pavement in tons and cubic meters
Binary Calculator — The Binary Calculator performs AND, OR, and XOR operations on two binary numbers. Enter two values made of 0s
Radiation Converter — The Radiation Converter changes values between the units used to measure ionising radiation. Use it when you a
Expansion Joint Estimator — Plan concrete movement joints correctly for slabs, pavements, and long structural elements. Enter the structur
Square Footage Calculator — The Square Footage Calculator converts a rectangle's length and width, entered in feet, into four area units:
Permutation and Combination — The Permutation and Combination tool counts the number of ways to choose r items from a total of n items, with
Soil Bearing Capacity Helper — The Soil Bearing Capacity Helper estimates the footing size needed to support a column load on a given soil ty
Dice Roller — The Dice Roller rolls virtual dice for board games, RPGs, and math practice. Choose a die type and how many di
Braking Distance Calculator — The Braking Distance Calculator estimates the total distance a vehicle needs to stop, combining reaction dista
Freight Volumetric Weight — The Freight Volumetric Weight tool calculates the volumetric weight of a shipment and compares it with the act
Wind Energy Calculator — The Wind Energy Calculator estimates the electrical power a wind turbine can generate from the blade radius, w
Wave Frequency Calculator — Wave Frequency Calculator solves the wave equation v = f·λ for any one of its three variables. Choose whether
URL Encoder/Decoder — URL Encoder/Decoder converts plain text into percent-encoded URL components and decodes them back to readable
URL Decoder & Safety Check — URL Decoder & Safety Check is a free browser-based tool that decodes percent-encoded URLs so you can see the r
Tyre Size Calculator — The Tyre Size Calculator compares an old and a new tyre size and shows how the overall diameter changes, along
Text to Morse Code Converter — Text to Morse Code Converter is a free browser-based tool that translates English text into Morse code and con
Text Sentiment Analyzer — Text Sentiment Analyzer estimates whether a piece of writing sounds positive, negative, or neutral. Paste a re
Temperature Converter — Convert temperatures between Celsius, Fahrenheit, Kelvin, and Rankine with this instant online converter. It i
Tag Generator — The Tag Generator turns a content keyword into a list of relevant hashtag suggestions you can use on social me
Fuse Size Calculator — The Fuse Size Calculator helps you determine the fuse rating needed to protect an electrical circuit. Enter th
Solar Panel ROI Calculator — The Solar Panel ROI Calculator shows whether a solar installation is worth the money. Enter the system cost, e
Slug Generator — Slug Generator turns any title or phrase into a clean, SEO-friendly URL slug. Type or paste your title, and th
Screen Brightness & Contrast Helper — Screen Brightness & Contrast Helper is a visual tool that helps you adjust your display for comfortable viewin
Running Pace Calculator — Running Pace Calculator turns a distance and a finish time into your average running pace and speed. Enter the
RGB to HEX Converter — The RGB to HEX Converter translates colors between the RGB, HEX, and HSL color models. Use it when you need a
QR Code Pro Generator — The QR Code Pro Generator creates high-quality QR codes with deep customization: enter any content, choose the
Concrete Column Volume Calculator — Find the volume of concrete needed for a rectangular column. Enter the length, width, and height in consistent
Mole Calculator — Calculate the number of moles n from the mass m and the molar mass M using n = m/M, or solve for mass m = n ×
Meeting Cost Calculator — The Meeting Cost Calculator reveals how much a meeting really costs your business. Enter the number of attende
Mass Percentage Calculator — Calculate the mass percentage (w/w%) of a solute in a solution by entering the solute mass and the total solut
Image Compressor — Reduce the file size of your images without uploading them anywhere. Choose an image, adjust the quality from
Grade Calculator — Calculate your final grade from assignments that carry different weights. Enter each assignment score and its
Earthquake Epicenter Distance Calculator — The Earthquake Epicenter Distance Calculator estimates how far a seismic station is from an earthquake epicent
Doppler Effect Calculator — The Doppler Effect Calculator estimates the observed frequency of a wave when the source or the observer is in
Depreciation Calculator — The Depreciation Calculator estimates how much an asset loses value each year using the straight-line or doubl
Density Calculator — The Density Calculator works out density, mass, or volume whenever you know two of the three quantities. Choos
Checklist Maker — Build detailed, customizable task checklists and track your progress as you complete each item. Add a list tit
Binary Text Converter — Convert any text into 8-bit binary code and decode binary back into readable text with the Binary Text Convert
Appliance Power Calculator — The Appliance Power Calculator estimates the monthly and yearly energy consumption of household appliances in
Cake Serving Calculator — The Cake Serving Calculator estimates how many servings you can cut from a cake based on your pan's size and s
Food Serving Calculator — The Food Serving Calculator tells you how many full servings a dish provides from its total weight. Enter the
Video Storage Calculator — The Video Storage Calculator estimates how much space your videos will take or how many hours fit on a drive.
Freezer Storage Calculator — The Freezer Storage Calculator shows the maximum time common foods stay good in a freezer kept at -18C. Pick a
Walking Calorie Calculator — The Walking Calorie Calculator estimates how many calories you burn on a walk from your weight, walking time,
Room Ventilation Calculator — The Room Ventilation Calculator works out the airflow needed to keep a room healthy. Enter the room area, ceil
Training Intensity Calculator — The Training Intensity Calculator computes your relative training intensity as a percentage using one of two m
Baking Pan Conversion Calculator — Scale a recipe between baking pans of different sizes with this pan conversion calculator. It compares the bas
Task Completion Percentage Calculator — The Task Completion Percentage Calculator shows what percentage of your tasks you have completed and how many
Photosynthesis Rate Calculator — The Photosynthesis Rate Calculator computes the rate of oxygen production of a plant sample from the oxygen pr
Inbreeding Coefficient Calculator — The Inbreeding Coefficient Calculator computes the inbreeding coefficient F from a comma-separated list of rel
Bayes Theorem Calculator — The Bayes Theorem Calculator applies Bayes' rule to compute the conditional probability P(A|B) from three inpu
Heat Conduction Calculator — The Heat Conduction Calculator uses Fourier's law to compute the steady-state heat transfer rate through a mat
Grout Calculator — Estimate the grout you need for tile joints. Enter the tile length and width in centimeters, the joint width a
Masonry Materials Calculator — Estimate the bricks, mortar, and cement bags needed to build walls. Enter the wall area in square meters, choo
Skewness & Kurtosis Calculator — The Skewness & Kurtosis Calculator summarizes the shape of your data distribution. Enter at least four numbers
Series Resistor Calculator — The Series Resistor Calculator finds the total resistance of two to four resistors connected in series. Enter
Business Days Between — The Business Days Between tool counts the number of business days (Monday to Friday) between a start date and
P-value Calculator — The P-value Calculator turns a z-score into a p-value using either a one-tailed or a two-tailed test. Enter yo
Commission Calculator — The Commission Calculator computes the commission on a sale and the net amount remaining after the commission
Obscure English Units — The Obscure English Units converter handles less-common historical English measures such as the nautical mile,
Gypsum Board Calculator — Work out how many gypsum boards and main runners you need for a suspended ceiling. Enter the ceiling area in s
Arabic Land Area Converter — The Arabic Land Area Converter converts land areas between Egyptian and regional units such as the feddan, qir
Number Sequence Calculator — The Number Sequence Calculator works with arithmetic and geometric sequences. You choose the sequence type, en
Height Calculator — The Height Calculator converts height between feet and inches and centimeters. Enter a height in feet and inch
Water Intake Calculator — The Water Intake Calculator estimates your daily hydration goal in millilitres and cups from your body weight,
Text to Speech — Read any text aloud right in your browser with the Text to Speech tool. Paste or type text, press Play Speech,
Circuit Power Calculator — The Circuit Power Calculator computes electrical power in a circuit using the formula P = V × I, where V is th
Sequence Sum Calculator — The Sequence Sum Calculator computes the sum of the first n terms of an arithmetic or geometric sequence and a
Screen Vision Test — Screen Vision Test is a rough awareness check that uses symbols at different sizes to give you a general idea
Roommate Expense Splitter — The Roommate Expense Splitter divides shared household costs between roommates fairly. You enter the rent and
ROI Calculator — The ROI Calculator measures how profitable an investment is. Enter the investment amount and the total return
README Generator — The README Generator turns a few project details into a clean README.md file ready for GitHub. Use it when you
Profit Margin Calculator — The Profit Margin Calculator turns revenue and cost into three numbers: absolute profit, profit margin as a pe
Permutation & Combination Calculator — The Permutation & Combination Calculator computes the number of ways to select r items from a set of n items,
Percentage Change Calculator — The Percentage Change Calculator shows how much a value increased or decreased compared with an earlier value,
Hydraulic Force Calculator — The Hydraulic Force Calculator computes the force produced by a hydraulic system using F = P × A, where P is t
Oxidation Number Calculator — The Oxidation Number Calculator finds the oxidation number of an unknown element in a neutral compound or a ch
OKR Planner — OKR Planner helps you write an Objective and measurable Key Results, then shows the overall progress and an au
Ohm's Law Calculator — The Ohm's Law Calculator computes voltage, current, or resistance from any two known electrical values using V
Centripetal Acceleration Calculator — The Centripetal Acceleration Calculator estimates the acceleration that keeps an object moving in a circle, us
Newton's Second Law — The Newton's Second Law calculator applies F = m × a to find force, mass, or acceleration when any two of the
Molecular Weight Calculator — The Molecular Weight Calculator computes the molar mass of any chemical compound from its molecular formula, r
Mohs Hardness Scale Identifier — The Mohs Hardness Scale Identifier helps you estimate the hardness of a mineral by comparing it with the ten r
LED Savings Calculator — This tool calculates the savings from replacing traditional bulbs with LED lighting. Enter the number of bulbs
Keyword Extractor — The Keyword Extractor scans an article you paste and surfaces the most frequent and relevant words and phrases
Investment Return Calculator — The Investment Return Calculator projects how a lump sum plus regular monthly contributions will grow at an an
HTML Strip Tool — Remove all HTML tags from a page or snippet and keep clean, copyable plain text. Paste the markup, strip the t
GDPR Compliance Checklist — Check how well your website meets core GDPR privacy requirements with this interactive checklist. Mark the twe
Expense Tracker — The Expense Tracker is a simple bookkeeping tool that helps you record and review daily and monthly spending.
Centripetal Force Calculator — The Centripetal Force Calculator solves Fc = m times v squared / r for any of its four variables. Select the q
Pool Volume Calculator — The Pool Volume Calculator finds the water volume of a rectangular, round, or oval swimming pool. Choose the p
Coffee Ratio Calculator — The Coffee Ratio Calculator works out how much water or coffee you need for a chosen brew ratio. Enter the amo
Phone Storage Calculator — The Phone Storage Calculator shows how a phone's total capacity is split between apps, photos, videos, and aud
Room Capacity Calculator — The Room Capacity Calculator estimates the maximum number of people that can safely occupy a room. Enter the r
Running Split Calculator — The Running Split Calculator divides a total running time into equal parts so you can plan a steady race or a
Electricity Bill Estimator — The Electricity Bill Estimator calculates the monthly energy consumption in kilowatt-hours and the cost for yo
Garden Watering Calculator — The Garden Watering Calculator estimates the water volume your garden needs and the run time to deliver it. En
Image File Size Calculator — The Image File Size Calculator estimates the uncompressed size of a bitmap image from its width, height, and c
Rice Water Ratio Calculator — The Rice Water Ratio Calculator tells you how much water to add for the amount of dry rice you are cooking. En
Shopping Cart Total Calculator — The Shopping Cart Total Calculator adds up to four item prices and applies a sales-tax percentage to give the
Rainwater Harvesting Calculator — The Rainwater Harvesting Calculator estimates how much rainwater you can collect from your roof each year. Ent
Bulk Purchase Savings Calculator — The Bulk Purchase Savings Calculator shows how much you save when you buy a larger pack instead of paying the
Furniture Arrangement Calculator — The Furniture Arrangement Calculator helps you lay out furniture along a wall by comparing the total piece len
Toll Cost Calculator — Budget for every toll gate on your route with the Toll Cost Calculator. Enter each toll segment on its own lin
Driving Time Calculator — The Driving Time Calculator estimates how long a car journey will take based on distance and average speed. En
DNA Dilution Calculator — The DNA Dilution Calculator finds the exact stock volume and solvent volume needed to dilute a DNA stock solut
Cardiac Index Calculator — Cardiac Index Calculator divides cardiac output by body surface area to give the cardiac index, a standard mea
Mark-Recapture (Lincoln-Petersen) Calculator — The Mark-Recapture Calculator estimates the total size of a wild population using the Lincoln-Petersen method.
Total Body Water Calculator — The Total Body Water Calculator estimates the amount of water in your body using the Watson formula. Enter you
BAC Calculator — The BAC Calculator estimates blood alcohol content using the Widmark formula from your gender, weight, number
RC Beam Capacity Calculator — The RC Beam Capacity Calculator determines the design flexural capacity of a reinforced concrete beam. Enter t
RC Time Constant Calculator — The RC Time Constant Calculator determines the time constant of an RC circuit from resistance and capacitance.
Dilution Calculator — The Dilution Calculator finds the final volume needed to reach a target concentration, plus the volume to add
Quartile Calculator — The Quartile Calculator splits your data into four equal parts and reports the first quartile (Q1), the median
Variance Calculator — The Variance Calculator measures how spread out a set of numbers is. It computes both sample variance (n-1) an
Concrete Pipe Volume Calculator — The Concrete Pipe Volume Calculator computes the volume of a single concrete pipe and the total concrete volum
Standard Error Calculator — The Standard Error Calculator estimates the standard error of the mean, which measures how precisely a sample
Brick Counter — The Brick Counter estimates the number of bricks required per square meter and per cubic meter, the total bric
Slope Calculator — The Slope Calculator finds the slope, the line equation in the form y = mx + b, the midpoint, and the distance
Period Calculator — The Period Calculator predicts your next period, the approximate fertility window, and ovulation day from your
Z-score Calculator — The Z-score Calculator converts a raw value into its standard score using the mean and standard deviation you
Big Number Calculator — The Big Number Calculator adds or multiplies two positive whole numbers of any size without losing precision.
Income Tax Calculator — The Income Tax Calculator estimates annual income tax for a given annual income in Egyptian pounds. Enter your
Anorexic BMI Calculator — The Anorexic BMI Calculator computes your Body Mass Index from weight and height, then focuses on the low end
Luggage Weight Balancer — Balance the combined weight of your items across several suitcases before you travel. Enter the weight of each
Vulnerability Score Calculator — Vulnerability Score Calculator computes the CVSS v3.1 base score of a security vulnerability from its attack c
DC Power Calculator — The DC Power Calculator computes the power of a direct current (DC) circuit using the formula P = V × I, where
Subscription Revenue Calculator — The Subscription Revenue Calculator estimates the recurring revenue of a subscription business. Enter the numb
Specific Gravity Calculator — Find the specific gravity of a solid sample from its weight in air and its weight while suspended in water. En
Social Media Character Counter — Social Media Character Counter helps you count characters and see how much space remains before you post. Past
Battery Runtime Calculator — The Battery Runtime Calculator estimates how long a battery can power a load using the formula t = Ah / A, whe
Sand Calculator — The Sand Calculator estimates the weight of sand needed to fill an area from its length, width, and depth. Bui
QR Code Generator & Scanner — QR Code Generator & Scanner creates QR codes from the text or URL you enter and lets you control the image siz
Aggregate Calculator — Estimate the weight of an aggregate material from its volume and density. Enter the volume of gravel, sand, or
Probability Calculator — The Probability Calculator finds the chance of an event from its favorable and total outcomes, and combines th
Plant Watering Calculator — The Plant Watering Calculator builds a tailored watering schedule for your plants by combining plant type, pot
Ostwald Dilution Law Calculator — The Ostwald Dilution Law Calculator computes the degree of dissociation α, the ionization constant Ka, or the
Ohm's Law Extended — The Ohm's Law Extended calculator solves for resistance, voltage, or current from the other two values, and re
Morse Code Converter — Convert text to International Morse code and decode Morse back into readable text. Choose Text to Morse or Mor
Momentum and Impulse Calculator — The Momentum and Impulse Calculator works in two modes: it computes momentum with p = m × v and force with F =
Meal Prep Planner — The Meal Prep Planner helps you organize a full week of meals by day. Add each meal's name, calorie count, and
Matrix Calculator — The Matrix Calculator performs four operations on 2x2 matrices: the determinant of A, the inverse of A, additi
Lens Formula Calculator — The Lens Formula Calculator applies the thin lens equation 1/f = 1/v + 1/u to find the missing value among foc
Keyword Density Checker — Analyze how often every word appears in your content and spot overused keywords instantly. Paste your article,
Image to Base64 — Encode any image into a Base64 string that you can paste directly into HTML, CSS, or JSON. Upload an image to
Grade Converter — The Grade Converter changes a score between common grading scales: percentages, the 4.0 and 5.0 point systems,
FIRE Calculator — The FIRE Calculator estimates the savings target you need to achieve financial independence based on your annu
Electric Power Calculator — The Electric Power Calculator determines electrical power, voltage, current, or resistance from any two known
Buoyancy Calculator — The Buoyancy Calculator applies Archimedes' principle to find the upward force on a submerged object. Enter th
Fertilizer Calculator — The Fertilizer Calculator works out how much fertilizer product you need to supply a chosen nutrient. Select t
Carpet Roll Calculator — The Carpet Roll Calculator works out how much carpet you need for a room and how much it will cost. It compute
Garden Soil Calculator — The Garden Soil Calculator tells you how much soil you need to fill a garden bed or raised bed. Enter the area
Screen Size Calculator — The Screen Size Calculator converts a display's pixel dimensions into physical measurements in inches. Enter t
Plant Spacing Calculator — The Plant Spacing Calculator counts how many plants fit in a garden bed based on your planting distances. Ente
Reading Speed Calculator — The Reading Speed Calculator measures how many words you read per minute from the number of words read and the
Package Volume Calculator — The Package Volume Calculator works out the total space a parcel occupies from its length, width, and height.
Cycling Calorie Calculator — The Cycling Calorie Calculator estimates how many calories you burn during a bike ride from your weight, ridin
Oven Temperature Converter — The Oven Temperature Converter switches between Celsius, Fahrenheit, and oven gas marks in one step. Enter a t
Pantry Inventory Calculator — The Pantry Inventory Calculator gives you a quick picture of what your pantry is worth and how long it will la
Swimming Calorie Calculator — The Swimming Calorie Calculator estimates the energy you burn in the pool based on your weight, swim time, and
Home Backup Power Calculator — The Home Backup Power Calculator sizes the battery you need to run essential loads during a power outage. Ente
Solar Panel Count Calculator — The Solar Panel Count Calculator estimates the number of solar panels needed for a home. Enter your daily ener
Air Conditioner Size Calculator — The Air Conditioner Size Calculator estimates the cooling capacity needed for a room in BTU per hour and in to
Restaurant Menu Cost Calculator — The Restaurant Menu Cost Calculator works out a suggested menu price from your dish ingredient cost and a targ
Food Cost Per Serving Calculator — The Food Cost Per Serving Calculator works out how much one serving of a recipe costs. Enter the total ingredi
Commute Savings Calculator — The Commute Savings Calculator compares the monthly cost of driving your car with the monthly cost of public t
Anion Gap Calculator — Anion Gap Calculator works out the anion gap from three blood electrolytes: sodium, chloride, and bicarbonate.
Mutation Rate Calculator — The Mutation Rate Calculator turns observed mutations into a per-site, per-generation rate. Enter the number o
Seed Germination Rate Calculator — The Seed Germination Rate Calculator computes the germination percentage from the numbers of germinated and to
Cell Generation Time Calculator — The Cell Generation Time Calculator determines how long each generation lasts in a growing cell population fro
One-Way ANOVA Calculator — The One-Way ANOVA Calculator compares the means of three or more groups using analysis of variance. Enter the
Time Duration Calculator — This Time Duration Calculator tells you exactly how long has passed between two times, broken down into hours
Area Calculator — The Area Calculator finds the area of common shapes in one step. Pick a square, rectangle, triangle, circle, o
Average Calculator — The Average Calculator processes a list of numbers to report the mean, sum, count, and median together. Paste
Fat Intake Calculator — This Fat Intake Calculator converts your daily calorie target into recommended fat grams. It shows the healthy
Concrete Mix Components — The Concrete Mix Components calculator estimates the cement, sand, gravel, and water required for a given conc
Bra Size Calculator — The Bra Size Calculator works out your bra size from two measurements: underbust and bust in centimeters. It r
XSS Prevention Guide — XSS Prevention Guide helps you stop Cross-Site Scripting attacks by combining a practical HTML encoder with a
Time Tracker — Log exactly how long you spend on work with the Time Tracker. Name a project, add an optional label, press Sta
Battery Energy Calculator — The Battery Energy Calculator converts battery capacity in ampere-hours (Ah) to stored energy in watt-hours (W
Simple Pendulum Calculator — Simple Pendulum Calculator finds the period and frequency of an ideal pendulum from its length. Enter the pend
Shipping Cost Calculator — The Shipping Cost Calculator estimates how much a shipment will cost. Enter the actual weight in kilograms and
Resistor Color Code Calculator — The Resistor Color Code Calculator decodes the color bands printed on resistors and returns the resistance val
Population Density Calculator — The Population Density Calculator estimates how crowded an area is by dividing the population by its land area
Ohm's Law for Closed Circuit Calculator — The Ohm's Law for Closed Circuit Calculator computes the current in a circuit that includes the source interna
Momentum Calculator — The Momentum Calculator computes the linear momentum of a moving object from its mass and velocity using p = m
Molarity Calculator — Calculate the molarity M, the number of moles n, or the volume V of a solution by selecting the quantity to so
Hex to ASCII Converter — Convert between hexadecimal and ASCII text in seconds. Choose Text to Hex to see each character as a two-digit
Email Extractor — Extract every email address from a large block of text and collect it into a clean, deduplicated list. Paste m
Color Palette Matching — Find colors that work well together starting from a single base color. Choose your base color and a harmony ty
Canonical URL Tool — Canonical URL Tool generates the canonical tag and Link header for any URL you enter, helping search engines i
ASCII Converter — The ASCII Converter changes text into ASCII codes and converts ASCII codes back into text. Pick the direction,
Image DPI Calculator — The Image DPI Calculator finds the print resolution (DPI) your image will have at a chosen print size, reporti
Pizza Dough Calculator — The Pizza Dough Calculator turns a pizza size into exact dough ingredients. Enter the pizza diameter in centim
Video Bitrate Calculator — The Video Bitrate Calculator helps you pick encoding settings for your videos. Enter the duration in hours, th
Deadline Buffer Calculator — The Deadline Buffer Calculator tells you how many working days you need to finish a task and how much buffer t
Typing Accuracy Calculator — The Typing Accuracy Calculator measures the accuracy of your typing and your error rate as percentages. Enter
Presentation Time Calculator — The Presentation Time Calculator estimates the total length of a presentation from the number of slides, the t
Solar Battery Size Calculator — The Solar Battery Size Calculator sizes the battery bank for an off-grid or backup solar system. Enter your da
Screen Aspect Ratio Calculator — The Screen Aspect Ratio Calculator reduces a screen's width and height in pixels to its simplest ratio, such a
Web Hosting Storage Calculator — The Web Hosting Storage Calculator estimates how much hosting storage your website will need now and in the fu
Household Water Usage Calculator — The Household Water Usage Calculator estimates daily and monthly water use across common household activities.
Meeting Time Allocation Calculator — The Meeting Time Allocation Calculator divides a meeting's duration across its agenda items. Enter the total m
Car Payload Calculator — The Car Payload Calculator shows how much load your vehicle can still safely carry. Enter the maximum payload,
Cardiac Output Calculator — The Cardiac Output Calculator computes cardiac output (CO) in liters per minute from your heart rate (bpm) and
Surface Area to Volume Ratio Calculator — This Surface Area to Volume Ratio Calculator works out the surface area, volume, and surface-to-volume ratio f
F-Test Calculator — The F-Test Calculator compares the variances of two samples by forming the ratio of their variances. Enter the
Power Factor Calculator — The Power Factor Calculator determines the power factor of an AC circuit from real power, voltage, and current
Budget Calculator — The Budget Calculator compares your monthly income with your spending across housing, food, transport, bills,
Due Date Calculator — The Due Date Calculator estimates your due date from the first day of your last menstrual period (LMP) and you
Retaining Wall Calculator — The Retaining Wall Calculator estimates how many concrete blocks and cap stones you need for a retaining wall.
Vector Calculator — Perform vector operations on two 3D vectors: addition, subtraction, dot product, cross product, magnitude, and
Typing Speed Test — The Typing Speed Test measures how fast and how accurately you type in words per minute (WPM). As you type a s
Task Priority Matrix — Sort your to-do list with the Task Priority Matrix based on the Eisenhower method. Type a task name, mark whet
Solution Dilution Calculator — Find out how much stock solution and solvent you need to prepare a solution at a target concentration. Enter t
Nutrition Calculator — The Nutrition Calculator builds a complete nutrition summary for any meal or food item. Enter the per-serving
Inventory Turnover Calculator — The Inventory Turnover Calculator measures how efficiently a business sells and replaces its stock over a peri
Hydroxide Ion Concentration Calculator — Calculate the hydroxide ion concentration [OH⁻] of a weak base solution from the ionization constant Kb and th
Food Carbon Footprint — This tool calculates the carbon footprint of your daily food choices. Enter the grams you eat per day of beef,
EV Charging Calculator — This tool estimates how long it takes to charge an electric vehicle and how much that charge costs. Enter your
Engine Displacement Calculator — The Engine Displacement Calculator estimates the swept volume of an engine from its cylinder count, bore, and
EOQ Calculator — The EOQ Calculator works out the optimal order quantity that minimizes the combined cost of ordering and holdi
Emergency Fund Calculator — The Emergency Fund Calculator shows how much savings you need to cover your essential expenses for three or si
Email Subject Generator — Create compelling email subject lines by entering a topic or keyword and choosing an email type. Pick from new
Duplicate Line Remover — Remove duplicate lines from any block of text and keep only unique entries. Paste a list with one item per lin
Data Storage Unit Converter — Convert accurately between bits, bytes, and storage units with the Data Storage Unit Converter. Enter a value,
CO₂ Emissions Calculator — This tool estimates your household's monthly carbon dioxide emissions based on your electricity use and natura
Charles's Law Calculator — The Charles's Law Calculator solves V1/T1 = V2/T2 for gas volume or temperature at constant pressure. Enter th
Carbon Footprint Calculator — The Carbon Footprint Calculator estimates your annual carbon dioxide emissions from four everyday sources: car
Daily Meal Calorie Counter — The Daily Meal Calorie Counter estimates your daily calorie needs based on your weight, height, age, gender, a
Boyle's Law Calculator — The Boyle's Law Calculator solves P1V1 = P2V2 for gas pressure or volume at constant temperature. Enter three
Body Fat Calculator — The Body Fat Calculator estimates your body fat percentage using the US Navy circumference method, a widely us
Cycling Speed Calculator — The Cycling Speed Calculator works out your average cycling speed from the distance ridden and the time taken.
Grocery Budget Calculator — The Grocery Budget Calculator helps households estimate how much they should set aside for food each month. En
Baker's Percentage Calculator — Compute the exact weight of every dough ingredient from baker's percentages with this calculator. It is essent
Required Attendance Calculator — The Required Attendance Calculator shows how many of the remaining sessions you must attend to reach a target
Appliance Electricity Cost Calculator — The Appliance Electricity Cost Calculator estimates how much a single appliance costs to run. It takes the app
Commute Cost Calculator — The Commute Cost Calculator shows how much your daily car commute costs you each day, month, and year. Enter t
Pedigree Risk Calculator — The Pedigree Risk Calculator works out the probability that a child is affected by, carries, or is fully clear
Genetic Crossover Recombination Calculator — The Genetic Crossover Recombination Calculator converts the genetic distance between two genes in centimorgans
Population Density (Ecology) Calculator — The Population Density (Ecology) Calculator works out how crowded a population is by dividing the total number
Event Time Announcer — Show a single event time across multiple time zones around the world. Set the event timezone, date, and time,
Date Add/Subtract — The Date Add/Subtract calculator shifts any base date forward or backward by a chosen number of days, weeks, m
Lean Body Mass — The Lean Body Mass Calculator estimates your lean body mass (LBM) in kilograms using the Boer formula. Enter y
Distance Calculator — Distance Calculator finds the straight-line distance between two points, the slope of the line connecting them
Weight Watcher Points — The Weight Watcher Points Calculator converts calories, saturated fat, sugar, and protein into Weight Watcher
Average Return Calculator — The Average Return Calculator takes a series of annual returns and reports three summary statistics: the arith
Subtitle Time Shifter — The Subtitle Time Shifter adjusts the timing of every line in an SRT subtitle file by a single offset measured
Feed Ration Calculator — The Feed Ration Calculator uses the Pearson square to blend two feed ingredients so the mix reaches your targe
Day of Week Calculator — The Day of Week Calculator tells you which day of the week any given date falls on. Select a date and the tool
XML Formatter & Validator — XML Formatter & Validator is a free browser tool that cleans up messy XML. Paste any XML document, then click
Wedding Budget Calculator — Plan a wedding budget and track every expense in one place. Enter your total budget, the number of guests, and
Waste Calculator — The Waste Calculator breaks down your household waste by category and adds it up. Enter weekly amounts for org
Tip Calculator — The Tip Calculator works out the tip amount and the final bill total in one click, then splits everything per
Thermal Expansion Calculator — Thermal Expansion Calculator computes how much a material grows when heated, in either linear or volumetric mo
Mole Fraction Calculator — The Mole Fraction Calculator finds the mole fraction of any component in a solution or gas mixture using the f
STP Gas Volume Calculator — Convert between gas volume and moles at standard temperature and pressure (STP). Choose to solve for the volum
Stoichiometry Calculator — Convert between amounts of substances in a chemical reaction using the coefficients of a balanced equation. En
Battery Capacity Calculator — The Battery Capacity Calculator converts energy in watt-hours (Wh) to capacity in ampere-hours (Ah) using the
SMART Goal Creator — Write clear, structured goals with the SMART Goal Creator. Answer five prompts - Specific, Measurable, Achieva
Sleep Debt Calculator — Sleep Debt Calculator compares the sleep you actually got over the past week with the hours you need. Enter yo
Prompt Cleaner — Clean up AI prompts by removing excess whitespace, extra blank lines, and odd formatting before you send them.
Earthwork Cut and Fill Calculator — The Earthwork Cut and Fill Calculator compares the volume of earth cut from a site with the volume of earth ne
Projectile Motion Angle Calculator — Projectile Motion Angle Calculator works out the horizontal range, maximum height, and time of flight of a pro
Privacy Score Calculator — Evaluate your digital privacy level with a simple eight-point self-assessment. Toggle the privacy habits you p
Habit & Goal Tracker — Habit & Goal Tracker lets you log each daily habit, mark the day complete, and instantly see the current strea
Habit Tracker — Habit Tracker lets you log your daily habits, one checkbox per day, and instantly shows the current streak for
Freelance Rate Calculator — The Freelance Rate Calculator converts your target annual income into base hourly, daily, and weekly rates for
Deadline Calculator — Find out exactly how much time is left until a deadline in days, hours, minutes, weeks, and approximate workin
Bohr Energy Levels Calculator — The Bohr Energy Levels Calculator finds the energy of any principal level in the hydrogen atom with Eₙ = −2.18
Reading Time Calculator — The Reading Time Calculator estimates how long it takes to read any text from its word count and your reading
Essay Word Count Planner — The Essay Word Count Planner divides a target word count into concrete per-section goals. Choose an equal spli
Shelf Capacity Calculator — The Shelf Capacity Calculator shows how many items fit on a shelf and what they weigh. Enter the shelf length
Drip Irrigation Calculator — The Drip Irrigation Calculator estimates how much water a drip irrigation system consumes. Enter the number of
Irrigation Flow Calculator — The Irrigation Flow Calculator estimates the water flow an irrigation system must supply for a given field. En
Monthly Electricity Usage Calculator — The Monthly Electricity Usage Calculator totals the electricity consumption of several appliances in one go. E
Diffusion Rate Calculator — The Diffusion Rate Calculator applies Fick's first law to find the flux per unit area and the total diffusion
Transformer Ratio Calculator — The Transformer Ratio Calculator works out the relationship between the primary and secondary windings of a tr
Hex Calculator — The Hex Calculator computes bitwise AND, OR, and XOR operations between two hexadecimal numbers and displays t
Waterproofing Rolls — Plan the right number of waterproofing rolls for any surface with this calculator. Enter the area to be covere
Excavation & Soil Volume — The Excavation and Soil Volume calculator estimates how much soil is removed from a trench or pit. Enter the l
Paint & Putty Calculator — The Paint & Putty Calculator estimates the materials needed to finish interior walls. Enter the wall area in s
Heavy Equipment Costing — The Heavy Equipment Costing tool estimates the true operating cost of construction machinery per hour and per
Surface Area Calculator — The Surface Area Calculator computes the total surface area of a cube, rectangular box, cylinder, or sphere fr
Weekly Planner — Plan the whole week in one place with the Weekly Planner. Open a column for each day from Sunday to Saturday,
Step Count Converter — Step Count Converter turns your daily step count into distance, calories, and walking time. Enter how many ste
Split PDF — Split PDF divides a PDF into smaller files using page ranges such as 1-3, 4-6, 7. After you choose a PDF the t
Construction Grade Calculator — The Construction Grade Calculator finds the slope of a surface from its rise and run, expressed as a percentag
Quadratic Equation Solver — The Quadratic Equation Solver finds the roots of a quadratic equation of the form ax^2 + bx + c = 0. Enter the
Productivity Score Calculator — Rate your daily productivity with the Productivity Score Calculator. Enter how many tasks you completed, how m
Magnetic Field of a Straight Wire Calculator — The Magnetic Field of a Straight Wire Calculator finds the magnetic flux density around a long, straight wire
Lung Capacity Calculator — The Lung Capacity Calculator estimates your vital lung capacity based on height, age, and sex. Use it to get a
Cost of Living Calculator — The Cost of Living Calculator compares estimated living expenses between two cities to show the difference in
Box Volumetric & Storage Capacity — The Box Volumetric & Storage Capacity calculator estimates how many boxes can be packed into a warehouse, room
Soup Serving Calculator — The Soup Serving Calculator tells you how much soup to make for your guests. Enter the number of people and ch
Water Saving Calculator — Measure how much water you save when you switch to a lower-flow tap, shower head, or appliance. Enter the old
Photo Storage Calculator — The Photo Storage Calculator estimates how much space a set of photos needs, or how many photos fit into the s
Leftover Portion Calculator — The Leftover Portion Calculator tells you how many meals your remaining food will cover. Enter the weight of t
Dimensional Weight Calculator — The Dimensional Weight Calculator finds the dimensional weight of a parcel for air and ground freight and tell
Greenhouse Ventilation Calculator — The Greenhouse Ventilation Calculator sizes the ventilation fans for a greenhouse. Enter the length, width, an
Parking Cost Calculator — Estimate exactly what parking will cost with the Parking Cost Calculator. Enter the hourly rate, the number of
Serial Dilution Calculator — This Serial Dilution Calculator computes the concentration remaining after each step of a serial dilution seri
Drywall Calculator — The Drywall Calculator estimates how many gypsum boards, screws, and metal studs you need to cover a given wal
Voltage Divider Calculator — The Voltage Divider Calculator finds the output voltage of a two-resistor voltage divider from the input volta
Time Math Calculator — Time Math Calculator lets you add or subtract hours, minutes, and seconds from a base time entered in 24-hour
Rent Calculator — The Rent Calculator splits a total rent among the people sharing it and across the days of the period. Enter t
Ratio Calculator — The Ratio Calculator simplifies a ratio a:b to its lowest terms, finds the missing term d in the proportion a:
Golf Handicap Calculator — The Golf Handicap Calculator turns a round score into a score differential using the course rating and slope.
Material Wastage Estimator — The Material Wastage Estimator helps construction buyers plan orders by calculating how much extra material is
Ancient Egyptian Units Converter — The Ancient Egyptian Units Converter translates values between historical Egyptian length and weight units, su
Video Aspect Ratio Filler — Video Aspect Ratio Filler is a free browser tool that generates the CSS padding-top hack, the classic techniqu
Speed Calculator — The Speed Calculator computes speed from the distance and time you enter and converts the result into km/h, m/
UUID Generator — UUID Generator is a free browser tool that creates random UUID v4 identifiers for developers. Choose how many
Universal Gravitation Calculator — Universal Gravitation Calculator computes the gravitational force between two masses with Newton's law F = Gm1
Two-Factor Auth Guide — Two-Factor Auth Guide explains how to enable and manage two-factor authentication (2FA) on your online account
Travel Emissions Calculator — The Travel Emissions Calculator estimates the carbon footprint of a single journey. Enter the distance, choose
Text Diff Checker — Text Diff Checker compares two versions of a text and highlights the lines that were added, changed, or remove
Text Case Converter — Text Case Converter instantly changes text between uppercase, lowercase, title case, sentence case, alternatin
Study Timer — The Study Timer tracks how long you study and keeps a record of each session. Give a session a label, start th
AC Current Calculator — The AC Current Calculator estimates the current flowing in an alternating current (AC) circuit when the power,
Recycling Guide — The Recycling Guide is a quick lookup tool for waste sorting. Type a material name and the guide tells you whi
Reading Speed Test — The Reading Speed Test measures how fast you read by timing you through a passage and calculating words per mi
Profit & Loss Calculator — The Profit & Loss Calculator builds a simple income statement from revenue, cost of goods sold, operating expe
Power-to-Weight Ratio Calculator — Power-to-Weight Ratio Calculator compares engine power with vehicle weight, giving a ratio that reflects how s
Hooke's Law Calculator — The Hooke's Law Calculator finds the force exerted by a spring using F = k × x, where k is the spring constant
Hydronium Ion Concentration Calculator — Calculate the hydronium ion concentration [H₃O⁺] of a weak acid solution from the ionization constant Ka and t
Double-Slit Wavelength Calculator — The Double-Slit Wavelength Calculator computes the wavelength of monochromatic light from Young's experiment d
Calorie Calculator — The Calorie Calculator estimates your total daily energy expenditure (TDEE) using the Mifflin-St Jeor equation
Meat Portion Calculator — The Meat Portion Calculator helps you buy the right amount of meat for a meal or gathering. Enter the number o
Bread Hydration Calculator — Compute the hydration of a bread dough, or the water you need for a target hydration, with this bread hydratio
Humidifier Size Calculator — The Humidifier Size Calculator estimates the humidifier output your room needs to feel comfortable. Enter the
Price Per Liter Calculator — The Price Per Liter Calculator turns a product's total price and package volume into the cost per litre and pe
Race Finish Time Calculator — The Race Finish Time Calculator estimates your finish time from your pace or from split times. Enter the pace
Dough Temperature Calculator — The Dough Temperature Calculator finds the water temperature you need to reach a target dough temperature. Ent
Car Ownership Cost Calculator — See the full monthly cost of owning a car, not just the fuel bill. Enter the yearly costs for insurance, taxes
Car Maintenance Cost Calculator — Work out how much it really costs to maintain your car per kilometer. Enter your yearly maintenance spending a
Selection Coefficient Calculator — The Selection Coefficient Calculator finds the selection coefficient of two genotypes from their fitness value
Concrete Slab Volume Calculator — The Concrete Slab Volume Calculator estimates the concrete needed for a slab from its length, width, and thick
Online Stopwatch — Online Stopwatch is a precise browser stopwatch with start, pause, lap, and reset controls. Use it for workout
Factor Calculator — Factor Calculator takes a positive number and returns its prime factorization, the total number of factors, an
Present Value Calculator — The Present Value Calculator shows what a future amount is worth today by discounting it at an annual rate. En
Gemstone Weight Converter — Convert gemstone weights between carats, grams, grains, ounces, and points with the Gemstone Weight Converter.
Aquarium Volume — The Aquarium Volume Calculator estimates how much water your tank holds from its length, width, and height. Ch
Work & Energy Calculator — Calculate the mechanical work done by a force in joules using the formula W = F x d x cos(theta). Enter the fo
Travel Budget Calculator — Estimate the total cost of a trip before you book. Enter the trip duration, total flight tickets, and per-day
Atom Economy Calculator — Assess how efficiently a chemical reaction uses its atoms with the Atom Economy Calculator. Enter the mass of
Text to File Converter — The Text to File Converter turns plain text into a downloadable TXT file in a single step. Type or paste your
SVG to PNG Converter — The SVG to PNG Converter turns SVG code into a high-resolution PNG image directly in your browser. Use it when
Salary Calculator — The Salary Calculator converts an income amount between hourly, daily, weekly, monthly, and yearly pay periods
NPV Calculator — The NPV Calculator discounts a series of annual cash flows back to today using a discount rate and subtracts t
Note Organizer — Note Organizer saves your notes with a title, content, and a color tag, and keeps pinned notes at the top of t
Kitchen & Cooking Converter — The Kitchen & Cooking Converter helps you convert the volume measures used in everyday cooking - cups, tablesp
Hydration & Calorie Burner — The Hydration and Calorie Burner estimates the calories you burn during physical activity and the amount of wa
Half-Life Calculator — The Half-Life Calculator finds how much of a radioactive sample remains after a given time, using the exponent
Gravitational Force Calculator — The Gravitational Force Calculator applies Newton's law of universal gravitation to find the force between two
Factorial Calculator — Factorial Calculator computes the factorial n! of a non-negative integer and reports how many digits the resul
Daily Schedule Planner — Plan your day by scheduling tasks with a specific time and a priority of high, medium, or low. Add tasks to yo
Class Average Calculator — The Class Average Calculator combines the averages of two student groups into one overall class average. You e
Swimming Pace Calculator — The Swimming Pace Calculator works out your pace per 100 metres and the number of pool lengths you have swum.
Car Trip Distance Calculator — The Car Trip Distance Calculator works out the distance you travelled from two odometer readings. Enter the st
Dihybrid Cross Calculator — The Dihybrid Cross Calculator builds the 16-cell F2 grid for a two-trait cross from the mother and father geno
Foundation Volume Calculator — Estimate concrete volumes for isolated footings and connecting strap beams. Enter the footing length, width, t
Business Days Calculator — The Business Days Calculator adds a number of business days to a start date, skipping Saturdays, Sundays, and
Fraction Calculator — Fraction Calculator adds, subtracts, multiplies, and divides two fractions, then shows the simplified result a
Rebar Weight per Meter — The Rebar Weight per Meter tool converts a reinforcing bar's diameter into its weight per meter using the d²/1
Sample Size Calculator — The Sample Size Calculator determines how many respondents or observations you need for a survey. Choose a con
Army Body Fat Calculator — The Army Body Fat Calculator estimates your body fat percentage using the US Army tape method and checks the r
Subatomic Micro Scale Converter — Convert measurements between femtometers, picometers, angstroms, nanometers, micrometers, and thou/mil with th
Text Readability — Text Readability measures how easy your text is to read using the Flesch Reading Ease score, the Flesch-Kincai
Transformer Efficiency Calculator — The Transformer Efficiency Calculator finds the efficiency of a transformer as the ratio of output power to in
Standard Deviation Calculator — The Standard Deviation Calculator summarizes a dataset with key statistics: mean, median, standard deviation,
Sleep Cycle Calculator — Find the ideal bedtime to wake up refreshed. Pick the time you want to wake up and the calculator works backwa
Sequence Calculator — The Sequence Calculator generates the terms of an arithmetic or geometric sequence and computes their sum. Cho
Project Cost Calculator — The Project Cost Calculator estimates the total cost of a project from labor, tools, marketing, and a continge
Magnetic Moment Calculator — The Magnetic Moment Calculator estimates the magnetic moment of transition-metal ions from the number of unpai
Macros Calculator — The Macros Calculator turns your daily calorie target into grams of protein, carbohydrates, and fat. Pick your
Kinetic Energy Calculator — The Kinetic Energy Calculator computes the kinetic energy of a moving object from its mass and velocity using
Interactive To-Do List — Interactive To-Do List lets you add tasks, tick them off as done, and watch the completion percentage update a
Fitness Score Calculator — The Fitness Score Calculator turns three simple exercise results into one overall fitness score. It combines y
Casio-style Calculator — The Casio-style Calculator mimics the familiar layout of a handheld scientific calculator with memory keys, a
Avogadro's Number Calculator — Convert between the number of moles and the number of particles with Avogadro's Number Calculator. Enter the n
Meal Cost Calculator — The Meal Cost Calculator works out how much a recipe really costs to make. For each ingredient you enter the a
Download Time Calculator — The Download Time Calculator estimates how long it takes to download a file based on its size and your connect
Generator Size Calculator — The Generator Size Calculator suggests the generator size you need from your total running load. Enter the run
Refrigerator Energy Cost Calculator — The Refrigerator Energy Cost Calculator estimates what your fridge costs to run each month. Enter the fridge p
One-Sample Z-Test — The One-Sample Z-Test Calculator tests a hypothesis about a population mean when the population standard devia
Three-Phase Power Calculator — The Three-Phase Power Calculator computes real power, apparent power, and reactive power for a three-phase sys
Poisson Distribution Calculator — The Poisson Distribution Calculator finds the probability of observing a given number of events when events oc
Log Calculator — The Log Calculator returns the logarithm of a positive number for the base you choose: 10 (decimal), e (natura
Islamic Distance Converter — Convert Islamic distance units such as the cubit, span, fathom, and Islamic mile with the Islamic Distance Con
Rental Property Calculator — The Rental Property Calculator evaluates an income property from its price, monthly rent, monthly expenses, an
Wave Speed Calculator — Wave Speed Calculator computes the propagation speed of a wave from its frequency and wavelength using v = f·λ
Water Consumption Calculator — The Water Consumption Calculator estimates how much water your household uses each day from everyday habits. E
Scientific Calculator — The Scientific Calculator evaluates complex mathematical expressions typed as text, including basic arithmetic
Work Calculator — Work Calculator finds the work done by a force using W = F·d·cos(angle). Enter the applied force, the displace
Hydraulic Press Calculator — The Hydraulic Press Calculator computes the output force of a two-piston hydraulic system using Pascal's princ
Future Value Calculator — The Future Value Calculator projects how much a present amount grows after a number of periods at a given inte
Decision Maker Wheel — Add your options, spin the wheel, and let it pick a random choice for you. Perfect for settling debates, choos
Advanced QR Parser — Advanced QR Parser decodes the content of a QR code from an image you upload, entirely inside your browser. It
Recipe Scaling Calculator — The Recipe Scaling Calculator adjusts any recipe to the number of servings you need. Enter the original and ne
Oil Change Interval Calculator — Keep your engine healthy with the Oil Change Interval Calculator. Enter your current mileage, choose the oil t
Margin of Error Calculator — The Margin of Error Calculator estimates the uncertainty around a sample mean. Choose a confidence level of 90
Data Rate Converter — Convert data transfer speeds between bits and bytes with the Data Rate Converter. Enter a value, pick the sour
Dead Load Calculator — The Dead Load Calculator estimates the self weight of a building element from its thickness and material densi
Inflation Calculator — The Inflation Calculator shows how much a fixed amount will be worth in the future at a chosen annual inflatio
Conception Calculator — The Conception Calculator works backward from your expected due date to estimate the conception date, the firs
Pipe Slope Calculator — The Pipe Slope Calculator determines the gradient of a drainage or sewage pipe from its length and total fall.
Greco-Roman Weight Converter — Convert historical Greco-Roman weights such as talent, mina, libra, and uncia with the Greco-Roman Weight Conv
Mulch Calculator — The Mulch Calculator estimates how much mulch you need for a rectangular or circular garden bed. Enter the bed
Waist to Height Ratio — The Waist to Height Ratio Calculator works out your WHtR from just two measurements: waist circumference and h
Working Hours Calculator — The Working Hours Calculator adds up your working time across the day, week, and month. Enter the start and en
Water Bill Estimator — The Water Bill Estimator turns your monthly water consumption into a projected bill. Enter your liters per mon
Ratio & Proportion Calculator — The Ratio & Proportion Calculator solves two common problems: finding the missing term d in a proportion a:b =
Trench Volume Calculator — The Trench Volume Calculator estimates the volume of soil removed when digging a trench from its length, width
Impulse Calculator — The Impulse Calculator computes the impulse delivered to an object using J = F × t, where F is the average for
Ideal Weight Calculator — The Ideal Weight Calculator estimates your ideal weight in kilograms using four classic height-based methods:
Electrical Resistance Calculator — The Electrical Resistance Calculator finds the total resistance of a resistor network connected in series or i
Critical Angle Calculator — The Critical Angle Calculator finds the angle of incidence at which light traveling from a denser medium to a
AI Token Counter — The AI Token Counter estimates how many tokens a piece of text will use in a large language model. Paste your
CFU/mL Calculator — Calculate colony-forming units per millilitre from dilution plates
Token Count Estimator — The Token Count Estimator gives you a fast estimate of how many tokens a piece of text will consume in an AI m
Cell Seeding Density Calculator — The Cell Seeding Density Calculator tells you how many cells you need to seed a target density in a given area
Osmotic Pressure Calculator — The Osmotic Pressure Calculator applies the van't Hoff equation to a solution you describe. Enter the molarity
Volume Calculator — Calculate the volume of a cube, rectangular box, cylinder, sphere, or cone in a single step. Choose a shape, e
Plastering Calculator — The Plastering Calculator estimates the materials needed for wall plastering. Enter the wall area in square me
Fence Calculator — The Fence Calculator estimates the number of fence posts needed for a boundary from its perimeter and the spac
Exam Score Calculator — The Exam Score Calculator turns your raw test results into a clear grade. Enter how many questions you answere
BMR Calculator — The BMR Calculator estimates your Basal Metabolic Rate, the number of calories your body burns at complete res
Algebra Calculator — The Algebra Calculator evaluates a function f(x) that you type, such as 2x^2 + 3x - 5. Enter an x value for a
Carbohydrate Calculator — The Carbohydrate Calculator converts your daily calorie intake into a carbohydrate range in grams based on the
Voltage Drop Calculator — Voltage Drop Calculator estimates how much voltage is lost along a copper wire for single-phase and three-phas
Astronomical Distance Converter — Convert distances across the cosmos with the Astronomical Distance Converter. Enter a value, pick a source uni
SQL Query Builder — SQL Query Builder is a free browser tool that helps you construct valid SQL statements without memorizing synt
Placeholder Image Generator — The Placeholder Image Generator creates simple placeholder images with the exact dimensions and colors you cho
Friction Force Calculator — The Friction Force Calculator computes the friction force between two surfaces using F = μ × N, where μ is the
Fluid Pressure Calculator — The Fluid Pressure Calculator finds the total pressure at a given depth inside a stationary fluid. Enter the a
Flashcard Generator — The Flashcard Generator lets you build your own study deck by adding question-and-answer cards. Type the front
Maximum Electrons per Shell Calculator — The Maximum Electrons per Shell Calculator tells you how many electrons a principal energy level can hold usin
Inverter Size Calculator — The Inverter Size Calculator finds the right inverter capacity for your home loads in watts. Enter your total
Roof Rainwater Drainage Calculator — The Roof Rainwater Drainage Calculator estimates the flow rate that your roof produces during a design rainfal
Protein Molecular Weight Calculator — The Protein Molecular Weight Calculator estimates the molecular weight of a protein from its one-letter amino
Thermal Insulation Calculator — The Thermal Insulation Calculator estimates how many insulation boards you need for a given area and gives an
Time Zone Converter — Convert a date and time from one time zone to another with this online time zone converter. It is useful for r
RLC Circuit Impedance Calculator — The RLC Circuit Impedance Calculator finds the total impedance of a series AC circuit containing a resistor, a
Centripetal Force Calculator — The Centripetal Force Calculator computes the force that keeps an object on a circular path, using Fc = m time
Capacitor Energy Calculator — The Capacitor Energy Calculator computes the energy stored in a capacitor from its capacitance in microfarads
Circle Calculator — Circle Calculator computes the area, circumference, and diameter of a circle from a single input: the radius.
Fraction Simplifier — Fraction Simplifier reduces a single fraction to its simplest form and performs arithmetic on two fractions. F
Magnetic Force on a Current-Carrying Wire Calculator — The Magnetic Force on a Current-Carrying Wire Calculator computes the force a magnetic field exerts on a strai
CSS Beautifier — Format and beautify CSS code with proper indentation, line breaks, and organized structure.
Fuel Cost Per Trip Calculator — Plan a road trip budget with the Fuel Cost Per Trip Calculator. Enter the trip distance in kilometers, your ca
ROAS Calculator — The ROAS Calculator shows the return you get from every unit of ad spend. Enter your advertising revenue and t
Concrete Wall Volume Calculator — The Concrete Wall Volume Calculator estimates the volume of concrete needed to build a wall from its length, h
Advanced Age Calculator — The Advanced Age Calculator works out your exact age on a chosen target date in both the Gregorian and Hijri c
Healthy Weight Calculator — The Healthy Weight Calculator uses your height in centimeters to estimate a healthy weight range. It returns t
Islamic Volumetric Converter — The Islamic Volumetric Converter translates traditional Islamic volume measures - Mud, Sa, Qafiz, Karr and Was
Tile Calculator — The Tile Calculator estimates the number of floor tiles you need for a room. Enter the floor length and width
Scientific Notation Converter — The Scientific Notation Converter switches numbers between standard (decimal) form and scientific notation in
Percent Yield Calculator — The Percent Yield Calculator measures how efficient a chemical experiment was by comparing the actual yield wi
Weekly Meal Planner — Organize your meals for the whole week and keep a clear shopping plan. Plan what to cook each day, review vari
Free Fall Calculator — The Free Fall Calculator determines how long an object takes to fall from a given height and how fast it is mo
Data Breach Response Guide — Get immediate, GDPR-aligned guidance for responding to a data breach. Choose the breached data type and the nu
YouTube Tag Extractor — Extract all tags and keywords from any YouTube video for SEO analysis and content research.
Cron Expression Explainer — Decode 5-field cron expressions and list the next scheduled run times. Each field is described in plain langua
URL Builder — Assemble a clean, correctly encoded URL from its parts. Set the protocol, host, port, path, query parameters,
HTML Decoder — Decode HTML entities back to their original characters for content extraction and analysis.
HTML Encoder — Encode special HTML characters to their entity equivalents for safe inclusion in web pages.
HTML Beautifier — Format and beautify messy HTML code with proper indentation, line breaks, and structure.
JSON to PHP & JS Converter — Instantly convert JSON into a PHP array or a JavaScript object literal, with syntax-safe escaping for quotes a
Dew Point Calculator — Find the dew point from air temperature and relative humidity. The dew point is the temperature at which air b
JWT Generator — Create signed HS256 JSON Web Tokens directly in your browser. Build the payload, choose the header algorithm a
Regex Escape Tool — Turn literal text into a pattern-safe string for new RegExp(). Metacharacters such as . * + ? ^ $ { } ( ) | [
SQL Formatter — Format SQL queries with consistent indentation and keyword casing, or minify many lines into one compact state
HTML to Markdown Converter — Transform pasted HTML into clean Markdown. Headings, lists, links, images, code blocks, and emphasis are conve
CSP Generator — Build a Content-Security-Policy HTTP header or meta tag. Choose a strict or relaxed preset, toggle the directi
JSON Schema Validator — Check a JSON document against a JSON Schema (draft-07) and get every violation with its JSON path and failing
JS Beautifier — Format and beautify JavaScript code with proper indentation for better readability and debugging.
MD5 Generator — Generate MD5 hash checksums for any text or file to verify data integrity and detect changes.
CSS Unit Converter — Convert between px, rem, and em for a root font size you control (default 16px). See exact values plus a refer
Markdown Previewer — Render Markdown to styled HTML with a live split view. Raw HTML inside your Markdown is escaped before renderi
Markdown Editor — Write and preview Markdown in real-time with syntax highlighting and HTML export.
ULID Generator — Generate Universally Unique Lexicographically Sortable Identifiers. Each 26-character Crockford Base32 ID embe
Domain Information — Get comprehensive domain registration details including registrar, dates, nameservers, and WHOIS data.
My IP Address — Instantly discover your public IP address with additional network and location information.
Sitemap Generator — The Sitemap Generator creates an XML sitemap that lists your website pages so search engines can find and inde
Air Density Calculator — Estimate moist air density in kg/m³ from temperature, pressure, relative humidity, and altitude. Uses the idea
Absolute Humidity Calculator — Compute the actual mass of water vapor in a given volume of air (g/m³) from temperature and relative humidity
DNS Checker — Check DNS propagation across multiple servers worldwide to verify domain name resolution.
IP Information — Look up detailed information about any IP address including location, ISP, and network details.
Empirical Rule Calculator — Find the percentage within 1, 2, and 3 standard deviations of the mean for a normal distribution.
Complex Number Calculator — Perform addition, subtraction, multiplication, division, and modulus on complex numbers with step-by-step brea
YouTube Thumbnail Downloader — Download high-quality thumbnails from any YouTube video in various resolutions.
Relative Humidity Calculator — Compute relative humidity from air temperature and dew point using the Magnus vapor-pressure model. Converts a
Law of Sines Calculator — Solve non-right triangles by finding missing sides, angles, and area through the law of sines.
Geometric Mean Calculator — Compute the geometric mean of a set of positive numbers alongside the arithmetic mean for comparison.
T Distribution Calculator — Compute cumulative probabilities, critical t-values, and p-values for hypothesis testing with a t-statistic.
System of Equations Solver — Solve 2×2 and 3×3 systems of linear equations with Cramer's rule, determinant steps, and input matrix echoes.
Genotype Frequency Calculator — Calculate genotype frequencies from allele frequencies in a population
Definite Integral Calculator — Evaluate definite integrals accurately with composite Simpson's rule, with control over the number of interval
Fibonacci Calculator — Generate any term of the Fibonacci sequence with full precision, plus the golden-ratio quotient and prefix sum
Harmonic Mean Calculator — Compute the harmonic mean of rates like speeds and learn when it beats the arithmetic mean.
Polar to Rectangular Calculator — Convert back and forth between polar coordinates (r, θ) and rectangular coordinates (x, y) with angles in degr
Golden Ratio Calculator — Check whether two parts split a segment in the golden ratio φ, compute the missing part, and measure the devia
Weighted Average Calculator — Compute the weighted average of several values with their weights, showing each value's contribution.
Significant Figures Calculator — Count the significant figures of any number and round it to a chosen precision for science and engineering.
Polynomial Regression Calculator — Fit data to a quadratic or linear polynomial, showing the equation and R² fit quality.
Exponential Regression Calculator — Fit data to the exponential model y = a·e^(bx), display the equation, and predict new values.
Tire Size Comparison — Compare two tire sizes — width, profile, rim — to see the overall-diameter difference, the percentage change,
Brake Bias Calculator — Compare static weight distribution with the hydraulic brake-force split from caliper piston area, and see the
Outlier Calculator — Detect outliers in a dataset using the interquartile-range method with 1.5 and 3 fences.
Absolute Value Calculator — Compute the absolute value of any real number, its distance from zero, and its representation on the number li
Decimal to Fraction Calculator — Convert any terminating or repeating decimal into a fraction in lowest terms, with the simplification shown st
Cloud Base Calculator — Estimate the height of the cloud base from air temperature and dew point. Uses the standard meteorological rul
Derivative Calculator — Compute the derivative at any point with high-accuracy central differences, plus the tangent-line equation.
YouTube Timestamp Link Generator — Generate clickable YouTube links that start at a specific timestamp for sharing video moments.
Template Explorer — Browse and explore curated templates for websites, emails, documents, and design projects.
Transfer Space Calculator — Calculate the clearance space needed for wheelchair transfers
Limit Calculator — Compute two-sided and one-sided limits with accurate numerical approximation and side-value diagnostics.
Codon Translator — Translate a DNA or RNA sequence into its protein sequence using the standard genetic code, with start, stop an
QR Code Reader — Scan and decode QR codes from uploaded images to extract the embedded text, URL, or data.
Text to Link — Convert plain text into clickable hyperlinks with customizable URL and target settings.
Keyword Explorer — Discover keyword ideas, search volume estimates, and competition levels to plan your content strategy.
Touch Target Size Calculator — Calculate minimum touch target size according to WCAG guidelines
Sign Language Video Duration — Calculate required duration for a sign language interpretation video
PDF to Text — PDF to Text extracts the text content of a PDF right in your browser using pdfjs and saves it as a .txt file.
YouTube Thumbnail Preview — Preview how a YouTube thumbnail appears in search results and validate its dimensions and file size.
Kitchen Workspace Calculator — Calculate accessible kitchen workspace dimensions and clearance
Inverter Efficiency Calculator — Check how efficiently your inverter runs at your real load, see idle draw and daily battery use, and estimate
Tajima's D Calculator — Calculate Tajima's D statistic to detect selection signatures
Alt Text Accessibility Calculator — Evaluate quality and length of image alt text for accessibility
PDF Compressor — PDF Compressor reduces the size of your PDF files entirely in your browser using pdf-lib. Choose low, medium,
Home Masonry Calculator — Estimate cement, sand and material cost for masonry jobs at home — mortar volume, bags of cement, sand weight
YouTube Thumbnail Resizer — Resize and crop YouTube thumbnails to exact dimensions while maintaining aspect ratio and quality.
Image Size Compressor — Reduce image file sizes significantly without noticeable quality loss for faster web performance.
Test Cross Calculator — Determine unknown genotype by crossing with a homozygous recessive
AAC Symbol Grid Calculator — Calculate cell count and optimal size for an AAC symbol grid
Species Richness Calculator — Calculate species richness and estimates from sample data
Mutation Frequency Calculator — Calculate mutation frequency from DNA sequence variant data
Phenotype Frequency Calculator — Calculate phenotype frequencies from genotype data in a population
UI Target Size Calculator — Calculate accessible UI target size according to WCAG guidelines
Genetic Map Distance Calculator — Convert recombination frequency to genetic map distance in centiMorgans
Route Slope Calculator — Calculate slope percentage for accessible walking routes
Keyboard Navigation Time Calculator — Estimate time required for keyboard-only navigation of an interface
Counter Height Calculator — Calculate accessible counter and desk height with knee clearance
Turning Radius Calculator — Calculate the turning radius needed for a wheelchair
Audio Description Coverage — Calculate coverage of audio descriptions for visual elements
UTM Builder — UTM Builder constructs tracking URLs for your campaigns by appending utm_source, utm_medium, utm_campaign, utm
Word to PDF — Word to PDF exports a .docx or .doc file as a PDF using your browser’s built-in print-to-PDF dialog. The tool
CSV to Excel — CSV to Excel parses comma-separated data with a robust parser that handles quoted fields, escaped commas, and
File Hash Checker — File Hash Checker computes the SHA-1, SHA-256, SHA-384, or SHA-512 hash of a file right in your browser using
Solar System Sizer — Design an off-grid solar system — panels, battery bank and inverter size from your daily loads, peak sun hours
VPS vs Cloud Cost Estimator — Compare the monthly cost of hosting a website on a VPS versus object storage platforms like Cloudflare R2, AWS
Photosynthesis Calculator — Estimate photosynthesis rate from light, temperature, leaf area and light hours — calculates CO₂ fixed, oxygen
Page Payload Budget Calculator — Calculate a realistic page weight budget from your target load time and audience speed, and see what remains f
Appliance Power Cost Calculator — Estimate the running cost of each appliance and your PC — under load and idle — and see your daily, monthly an
QR Generator — Generate custom QR codes from text, URLs, contact info, or WiFi credentials with customizable colors.
URL Decoder — Decode URL-encoded strings back to their original readable text for debugging and extraction.
URL Encoder — Encode special characters in URLs for safe transmission over the internet and API requests.
Unique Colors — Extract all unique colors from an image as HEX, RGB, and HSL values for design reference.
Icon Maker — Create custom icons in various sizes from text, shapes, or images for websites and apps.
Image Format Converter — Convert images between PNG, JPEG, WebP, BMP, GIF, and SVG with quality preservation.
Image Sharing — Upload and share images instantly with a unique link. Get direct URLs for forums, emails, and websites.
Ramp Rise Calculator — Calculate the total rise of a wheelchair ramp
Knee Clearance Calculator — Calculate minimum knee clearance under accessible surfaces
DNA Copy Number Calculator — Calculate the number of DNA copies from template concentration
Door Opening Force Calculator — Calculate maximum allowable door opening force for accessibility
Form Label Accessibility Calculator — Evaluate form field label correctness for screen reader access
Color Vision Contrast Calculator — Calculate color contrast to ensure visibility for all users
Text Resize Calculator — Calculate layout impact when text is resized to 200%
Furniture Clearance Calculator — Calculate minimum clearance between furniture for wheelchair access
Favicon Generator — Favicon Generator lets you draw an icon on a canvas and exports PNG favicons at the standard sizes (16, 32, 48
Trophic Level Calculator — Model energy flow through an ecosystem’s food chain using the 10% rule — see how much energy reaches each trop
Facebook ID Finder — Find the numeric Facebook user ID from a Facebook profile URL for API integration and development.
Avatar Checker — Analyze and verify avatar images for proper display across social media platforms and websites.
SEO Checker — Analyze your website's SEO health with a comprehensive on-page audit covering meta tags, headings, images, and
Vmax Calculator — Calculate Vmax from Michaelis-Menten enzyme kinetics data
Allele Frequency Calculator — Calculate allele frequencies in a population from genotype counts
Caption Accuracy Calculator — Calculate caption accuracy by comparing to the original transcript
Michaelis-Menten Calculator — Calculate enzyme kinetics parameters from substrate concentration data
Species Evenness Calculator — Calculate Pielou's evenness from species abundance data
Shannon Diversity Index Calculator — Calculate Shannon-Wiener diversity index for ecological data
Text Contrast Ratio Calculator — Calculate text contrast ratio to meet WCAG standards
Screen Magnification Calculator — Calculate screen area required when content is magnified
Caption Reading Speed Calculator — Calculate optimal reading speed for caption text display
Ecological Efficiency Calculator — Calculate energy transfer efficiency between trophic levels
Wheelchair Ramp Slope Calculator — Calculate ramp slope ratio from rise and horizontal distance
Linkage Disequilibrium Calculator — Calculate linkage disequilibrium parameter D from haplotype frequencies
Accessible Reading Time Calculator — Estimate reading time accounting for varied reading speeds
Recombination Frequency Calculator — Calculate recombination frequency between two linked genes
Turning Space Diameter Calculator — Calculate the diameter of turning space for wheelchair users
Turning Space Calculator — Calculate minimum turning space required for wheelchair users
Content Resize Calculator — Calculate content resize impact on layout and user experience
Door Clearance Calculator — Calculate minimum door width clearance for wheelchair passage
JSON to Excel — JSON to Excel converts an array of JSON objects into a spreadsheet you can open in Excel. Because no xlsx libr
Passphrase Generator — Passphrase Generator creates secure passphrases from a curated word list using the browser’s cryptographically
Image Background Remover — Image Background Remover removes a solid or near-solid background from a photo client-side using canvas chroma
Final Drive Ratio Calculator — Compute the final drive (differential) ratio from ring and pinion teeth, and see the output RPM for any input
YouTube Channel Duration Calculator — Calculate the total content duration of any YouTube channel across all uploaded videos.
Text Generator — Generate random text, placeholder content, and sample data in various formats for testing and design.
HEX to RGB — Convert HEX color codes to RGB values instantly for web development and CSS styling.
Base64 to Image — Decode Base64 encoded strings back into viewable and downloadable image files.
Search Results Checker — Check how your website appears in search engine results including title, description, and snippet preview.
Speech Rate Calculator — Calculate words-per-minute speech rate and align it with captions
PCR Efficiency Calculator — Calculate PCR amplification efficiency from standard curve data
Enzyme Activity Calculator — Calculate enzyme activity in units per millilitre
Caption Coverage Calculator — Calculate coverage percentage for translated audio captions
Large Print Size Calculator — Calculate appropriate large print size for low-vision readers
Monohybrid Cross Calculator — Predict offspring ratios from a single-gene cross
Carrying Capacity Calculator — Calculate environmental carrying capacity for a population model
Simpson Diversity Index Calculator — Calculate Simpson's diversity index and dominance measure
Text Magnification Calculator — Calculate text magnification level needed for readability
Large Text Contrast Calculator — Calculate large text contrast ratio according to WCAG criteria
Plasmid Copy Number Calculator — Estimate plasmid copy number from DNA concentration and size
Readable Line Width Calculator — Calculate optimal characters per line for easy reading
Bed Height Calculator — Calculate accessible bed height for wheelchair transfers
Cognitive Reading Load Calculator — Calculate cognitive reading load based on text complexity and length
Reach Range Calculator — Calculate forward and side reach ranges for wheelchair users
Accessible Route Width Calculator — Calculate minimum corridor width for wheelchair accessibility
Transcript Completeness Calculator — Calculate transcript completeness compared to audio content
Accessible Parking Calculator — Calculate dimensions for accessible parking and access aisle
Specific Activity Calculator — Calculate specific activity of an enzyme in units per milligram
Generation Time Calculator — Calculate microbial generation time from growth curve data
Caption Characters Per Line — Calculate optimal character count per line for captions
Oligonucleotide Molecular Weight — Calculate molecular weight of a DNA or RNA oligonucleotide
Gear Ratio Calculator — Find the ratio between two gears from their tooth counts, then read the inverse ratio and the speed multiplica
Horsepower Calculator — Compute engine horsepower from torque and RPM for either lb·ft or N·m, with the result in both horsepower (HP)
Transpiration Calculator — Estimate plant transpiration rate from temperature, humidity, leaf area and light — key for irrigation plannin
YouTube Video Duration Checker — Check the exact duration, publication date, and statistics of any YouTube video.
YouTube Playlist Duration Calculator — Calculate the total watch time of any YouTube playlist to plan your viewing or content strategy.
Text to Binary — Convert text characters into binary code representation for programming and data encoding.
Binary to Text — Convert binary code strings into readable text characters for debugging and data analysis.
Codon Usage Bias Calculator — Analyze codon usage bias and optimization for a gene sequence
Mitotic Index Calculator — Calculate the mitotic index from cell division counts
Trophic Level Calculator — Calculate the trophic level of an organism in a food chain
FST Calculator — Calculate Wright's FST fixation index between populations
Curb Ramp Slope Calculator — Calculate curb ramp slope to meet accessibility standards
Water Potential Calculator — Calculate water potential from solute and pressure potential
RNA Concentration Calculator — Calculate RNA concentration from absorbance at 260 nm
Touch Target Spacing Calculator — Calculate minimum spacing between touch targets to prevent errors
Bacterial Growth Rate Calculator — Calculate specific growth rate from OD measurements over time
Amino Acid Composition Calculator — Calculate amino acid composition and molecular weight of a protein
Logistic Growth Calculator — Model logistic population growth with carrying capacity
Population Growth Calculator — Model exponential and logistic bacterial population growth
Favicon Checker — Favicon Checker fetches a website’s favicon to verify it is present and reachable. It parses the page’s tags,
Km Calculator — Calculate the Michaelis constant (Km) from enzyme kinetics data
Jaccard Similarity Calculator — Calculate Jaccard similarity and distance between two species lists
Keyboard Tab Count Calculator — Calculate number of tab presses needed for keyboard navigation
Nucleotide Diversity Calculator — Calculate nucleotide diversity (pi) from aligned sequences
Communication Board Grid Calculator — Calculate grid dimensions for a symbol-based communication board
Paragraph Spacing Calculator — Calculate paragraph spacing to improve accessible text clarity
Bathroom Clearance Calculator — Calculate bathroom clearance for wheelchair accessibility
Structured Data Generator — Structured Data Generator produces JSON-LD markup for common schema.org types, including Article, FAQPage, Pro
Sørensen Similarity Calculator — Calculate Sørensen-Dice similarity coefficient for community data
Cell Cycle Phase Calculator — Calculate the percentage of cells in each cell cycle phase
Wheelchair Ramp Length Calculator — Calculate required ramp length based on rise and slope ratio
Line Spacing Calculator — Calculate accessible line spacing for improved readability
Wire & Breaker Sizer — Find the recommended breaker size and minimum safe wire gauge for a load, including continuous-load derating a

Browse all tools — Browse categories