Sample Size Calculator — math calculators and step-by-step solvers
The Sample Size Calculator determines how many respondents or observations you need for a survey. Choose a confidence level (90%, 95%, or 99%), enter the expected proportion p and the margin of error, and the tool returns the sample size from Cochran's formula together with adjusted sizes for finite
Category: Statistics
About this tool
What Is Sample Size Calculator? Sample Size Calculator The Sample Size Calculator determines how many respondents or observations you need for a survey. Choose a confidence level (90%, 95%, or 99%), enter the expected proportion p and the margin of error, and the tool returns the sample size from Cochran's formula together with adjusted sizes for finite populations of 10,000 and 100,000. Use it when planning surveys, polls, and research studies.. How to Use Make sure you understand the formula or method this tool uses. Enter your values in the correct fields with compatible units. Review the result, compare it with expected values, and use the related tools if needed. Frequently Asked Questions How do I use Sample Size Calculator? Enter the required data in the appropriate fields and the tool will display the result immediately.