There are several online heat index calculators, just Google "heat index calculator". If you want to calculate it yourself you will need a scientific calclulator and a way to measure temperature and relative humidity. Once you have all that Plug them into the following equasion.

HI = -42.379 + 2.04901523T + 10.14333127R - 0.22475541TR - 6.83783x10 -3 T 2

- 5.481717x10 -2 R 2 + 1.22874x10 -3 T 2R + 8.5282x10 -4 TR 2 - 1.99x10 -6 T 2 R 2

HI = Heat Index

T = Tempurature

R = Relative Humidity

Good luck

The heat index combines air temperature and relative humidity to determine how hot it feels outside.

The heat index combines air temperature and relative humidity to determine how hot it feels outside.

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