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Enter the air temperature (ºC) and wet bulb or dew point temperature or Relative Humidity (RH) and all other values, except wet bulb, will be recalculated when you click or tab away from the entry box. Click on the "Lock DP" box to enter a new temperature at the same dew point. This allows calculation of the RH that the air will acquire at a different temperature.

Note: This calculator makes approximations that limit its use to the natural climate near sea level.

Air temperature Wet temperature Dew point RH

Lock Dew Point
 

Kg/m3 Kg/Kg Vapour pressure (Pa) svp


A calculator for atmospheric moisture. Developed by Tim Padfield (MA in Chemistry from Oxford University, Ph.D. from the Technical University of Denmark). You can visit the author's web site for a more detailed description of the calculations
Air temperature = measure in degrees Celsius of air temperature
Wet temperature = measure in degrees Celsius of thermometer with bulb covered with cloth soaked in distilled water
Dew point = The measure in degrees Celsius at which air cools until it is saturated with water vapour
Relative Humidity = measure in percentage of the "wetness" of the air
kg/m3 =measure in kilograms per cubic meter of the density of the air
Vapour Pressure = measure of pressure exerted by vapour

Find out what the below means:
 Saturation Vapour Pressure