Relative Humidity Calculator

Calculate Relative Humidity (RH) from Air Temperature and Dew Point.

Conditions

Air Temperature

Unit

Humidity Levels

Enter temperatures to calculate

About this calculator

Quick Reference

EVapor Pressure

EsSaturation Vapor Pressure

TTemperature

TdDew Point

Overview

Relative Humidity (RH) measures the amount of water vapor in the air compared to the maximum amount the air can hold at that temperature.

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Pro Tips

Fun Facts

"Warm air can hold more moisture than cold air."
"100% humidity doesn't mean the air is 'liquid', it just means it cannot hold any more invisible water vapor; any excess condenses into fog or rain."
"The 'Heat Index' combines air temperature and relative humidity to determine how hot it truly feels."

Formula: RH = 100 * (E / Es)