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Calculate Relative Humidity
Temperature: °F °C K

Wet-bulb Temperature: °F °C K

Station Pressure: in Hg mm Hg mbPaAtm

Relative Humidity:

Equations:

Equations to Calculate Relative Humidity from Wet-bulb

In the above equation, T is the temperature in °C, Wb is the wet-bulb temperature in °C, Psta is the station pressure in millibars, es is the saturation vapor pressure in millibars, ew is vapor pressure related to the wet-bulb temperature in millibars, e is the actual vapor pressure in millibars, and rh is the relative humidity in percent.