Relative Humidity Calculator

Enter the actual vapor density and the saturation vapor density into the calculator to determine the relative humidity.

Relative Humidity Formula

The following formula is used to calculate a relative humidity.

RH = VDa / VDs * 100

  • Where RH is the relative humidity (%)
  • VDa is the actual vapor density (g/m^3)
  • VDs is the saturation vapor density (g/m^3)

FAQ

What is a relative humidity?

A relative humidity is a ratio of the vapor density to saturation vapor density. It’s a measure of how much water vapor air can hold compared to how much water vapor it takes to saturate the air at any given temperature.

What is a saturated air?

A saturated air is one at a 100% relative humidity and that at the specific temperature it cannot hold any more water vapor.


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