Heat Index Calculator

Calculate how hot it feels based on temperature and humidity to assess heat-related health risks.

Temperature (°F)

Relative Humidity (%): 60%

0%100%

About Heat Index Calculator

Calculate the heat index (apparent temperature) based on actual temperature and relative humidity. The heat index shows what the temperature feels like to the human body.

Categories:

80-90°F: Extreme Caution (fatigue possible)
90-103°F: Danger (heat exhaustion possible)
103°F+: Extreme Danger (heat stroke likely)