Heat Index Calculator
Calculate how hot it feels with humidity (heat index).
Result
Results are estimates for general information only and are not professional advice.
Heat index
The heat index, or "feels-like" temperature, combines air temperature and humidity to show how hot it really feels. Using the standard Rothfusz regression, this calculator estimates it; it is most accurate at 27°C and above.
Frequently Asked Questions
What is the Heat Index Calculator?
Calculate how hot it feels with humidity (heat index). It runs instantly in your browser and is completely free.
Is the Heat Index Calculator free and does it require signup?
Yes. Every calculator on Calculatis is 100% free with no registration, and the values you enter are never stored.
How accurate is the Heat Index Calculator?
It uses standard, widely-accepted formulas. Results are reliable estimates for general use and are not a substitute for professional advice.