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Calcimator

Heat Index Calculator

Calculate the heat index (feels-like temperature) based on air temperature and humidity. Assess heat danger level.

Inputs

°F
%

Results

Heat Index

113.1°F

Heat Index235.72°F
Feels Like Increase18.1°F
Danger LevelDanger — heat cramps/exhaustion likely
How to Use This Calculator
  1. Enter the Air Temperature in °F (the calculator applies the NOAA heat index formula when temp is 80°F or above).
  2. Set the Relative Humidity (%).
  3. Review the Heat Index in °F and °C, the Feels Like Increase above actual temperature, and the Danger Level.
  4. At Extreme Danger (130°F+), limit all outdoor exposure and seek air conditioning immediately.
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