Absolute Humidity Calculator
Compute the actual mass of water vapor in a given volume of air (g/m³) from temperature and relative humidity using the ideal gas law.
Category: Environment & Energy
About this tool
Absolute humidity calculator using the ideal gas law ρ = e·M_w/(R·T). Inputs: temperature and relative humidity. Outputs: water vapor density in g/m³ and the actual vapor pressure in hPa. Independent of temperature, unlike relative humidity.