# Humidity

Calculators & converters

Humidity, Pressure , Rainfall unit, Temperature, Speed

Humidity Calculator

Dry-bulb:                                              Dew-Point:
Estimated RH(%):

Enter the dry bulb temperature ( Tdry ) and wet bulb temperature ( Twet) in degrees Celsius, then click on the Calculate RH button

 Tdry Twet

How the calculation works:

1. The pressure is assumed to be 101.3 kPa (kiloPascals).

2. A conversion factor is calculated: A = 0.00066 (1.0 + 0.00115 Twb)

3. The saturation vapor pressure is calculated at Twb: eswb = e[(16.78 Twb - 116.9)/(Twb + 237.3)]

4. The water vapor pressure is calculated: ed = eswb - A P (Tdb - Twb)

5. The saturation vapor pressure is calculated at Tdb: esdb = e[(16.78 Tdb - 116.9)/(Tdb + 237.3)]

6. The relative humidity is then calculated: RH = 100 ed/esdb

 Pressure converter Known Value Converted Value hPa mb mm Hg in Hg hPa mb mm Hg in Hg

 Rainfall unit converter Known Value Converted Value mm inch point mm inch point

 Temperature converter Known Value Converted Value deg C deg F Kelvin deg C deg F Kelvin

 Speed converter Known Value Converted Value km/h m/s knot mi/h km/h m/s knot mi/h

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