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Home/Other Calculators/Heat Index Calculator

Heat Index Calculator

Calculate heat index from temperature and humidity

Temperature (°F)

Relative Humidity (%)

Other

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Written by the EachTools Team

Last updated: January 2026

How Heat Index Is Calculated

The heat index combines air temperature and humidity to determine how hot it actually feels to the human body.

Steps

Enter the air temperature.
Input the relative humidity percentage.
View the heat index and danger level.