Calculate Dewpoint, Wet-bulb Temperature from Relative Humidity

Simple online weather calculator to find the dewpoint and the wet-bulb temperature by knowing the values of relative humidity, temperature and actual station pressure.

Dewpoint from Wet-bulb

  • Temperature:

    Fahrenheit Celsius Kelvin
  • Relative Humidity (%):

  • Actual station pressure:

    in of Hg mm of Hg millibars (hPA)
  •  Wet-bulb (Unit)


  • (Fahrenheit)

  • (Celsius)

  • (Kelvin)



T = Air temperature,
Tw = Wet-bulb temperature,
psta = Station pressure,
ew = Vapor pressure related to wet-bulb temperature,
es = Saturated Vapor pressure,
e = actual vapor pressure,
rh = Relative humidity,
Td = Dewpoint temperature.

Calculation of relative humidity and dewpoint is made easier by knowing the wet-bulb temperature.It is used in weather forecasting.