Relative Humidity Calculator

Calculate the relative humidity from temperature and dew point with this Humidity Calculator. Assuming a temperature range between -45 and 60 degrees celsius and no changes in air pressure.

Temp (Celsius):
Dew Point (Celsius):
Fill in the temperature and dew point to determine the approximate
relative humidity.

What is Relative Humidity?

Relative humidity is the amount of water vapor in the air.

To calculate humidity use this Relative Humidity Formula:

humidity formula

Example: When the ambient temperature (in celsius) is 35 degrees,
dew point is 30 degrees, the approximate relative humidity is:

Approximate Relative Humidity = 75%

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