Relative Humidity Calculator

The Relative Humidity Calculator determines the relative humidity percentage from various input parameters including dry bulb temperature, wet bulb temperature, or dew point temperature. This calculator is essential for HVAC design, meteorology, agriculture, and industrial process control.

Modify the values and click the calculate button to use
Calculation Method  
Temperature Unit  
Dry Bulb Temperature °C
Wet Bulb Temperature °C
Atmospheric Pressure kPa

Related Absolute Humidity Calculator | Dew Point Calculator | Wet Bulb Calculator

Understanding Relative Humidity

Relative humidity (RH) is the ratio of the current absolute humidity to the highest possible absolute humidity at a given temperature. It is expressed as a percentage and indicates how much moisture the air contains relative to its maximum capacity at that temperature.

Calculation Methods

Wet Bulb Method

This method uses dry bulb and wet bulb temperatures measured with a psychrometer:

Dew Point Method

This method uses the dew point temperature and dry bulb temperature:

Applications

Relative Humidity Ranges

Factors Affecting Relative Humidity