Free Heat Index Calculator - Given a temperature in Fahrenheit and a relative humidity percentage, this calculates the Heat Index.

This calculator has 2 inputs.

This calculator has 2 inputs.

HI = -42.379 + 2.04901523T + 10.14333127R - 0.22475541TR - 0.00683783T^{2} - 0.05481717R^{2} + 1.22874T^{2}R + 0.00085282TR^{2} - 0.00000199T2R^{2}

For more math formulas, check out our Formula Dossier

For more math formulas, check out our Formula Dossier

- fahrenheit
- Unit of temperature
- heat
- energy that is transferred from one body to another as the result of a difference in temperature
- heat index
- measure of how hot it really feels when relative humidity is factored in with the actual air temperature
- temperature
- degree of hotness or coldness measured on a definite scale. An average measure of the kinetic energy for particles of matter.