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How To Calculate Heat Index Formula
The heat index formula is a long and kind of scary-looking equation, but the process of calculating it is pretty easy because it's just a series of coefficients (factors you multiply by) attached to either temperature or relative humidity.
These coefficients account for a few different things that would make it a very complicated equation, but they're distilled into numerical values, so all you need to do is plug in your values for relative humidity and temperature and calculate.
The factors the formula takes into account include the surface area of the average human, how well skin radiates and absorbs heat, clothing cover and its resistance to heat and moisture transfer, sweating rate, core body temperature and much more.
Estimating each of these individually would make the formula difficult to use, but the values generally used are based on well-founded assumptions and averages, and so give a result that's broadly applicable to everyone.
The full heat index (HI) formula is:
\(HI = – 42.379 + (2.04901523 × T) + (10.14333127 × R) – (0.224
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