Weather Calculators
Heat Index Calculator
Calculate heat index from temperature and humidity; view danger levels.
What is the Heat Index Calculator & How does it work?
The Heat Index Calculator determines the apparent temperature, which reflects how hot it feels when relative humidity is factored in. This is crucial for assessing heat-related health risks.The formula adjusts the air temperature to account for moisture levels, providing a more accurate measure of discomfort. Understanding heat index helps in planning outdoor activities and staying safe during hot weather.
HI = -42.379 + 2.04901523*T + 10.14333127*RH – 0.22475541*T*RH – 6.83783*T^2 – 5.481717*RH^2 + 1.22874*T*RH^2 + 0.085282*RH*T^2 – 0.000536*T^2*RH^2
HI = Heat Index, T = Temperature (°F), RH = Relative Humidity (%)
Parameters
°C
%
Heat Index
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Heat Danger Category
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Results are for informational purposes only and do not constitute professional advice.