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Heat Index Calculator
<-- Enter Temperature (T) in Fahrenheit
<-- Enter Relative Humidity (R) %
How does the Heat Index Calculator work?
Given a temperature in Fahrenheit and a relative humidity percentage, this calculates the Heat Index.
This calculator has 2 inputs.
What 1 formula is used for the Heat Index Calculator?
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
What 4 concepts are covered in the Heat Index Calculator?
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.
Example calculations for the Heat Index Calculator
93% relative humidity and 85 temperature calculate heat index