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 to use.
What do I need to enter to use the Heat Index Calculator?
The Heat Index Calculator asks for the following values (2): Temperature (°C), Humidity (%). Fill them in and the result appears immediately — the calculation runs on your own device, so nothing you type is sent to a server.
How accurate is the Heat Index Calculator?
The Heat Index Calculator uses standard, widely-accepted formulas, so its figures are reliable estimates for everyday planning. They are not a substitute for advice from a qualified professional.
Is the Heat Index Calculator free, and do I need an account?
Yes. The Heat Index Calculator — and every other calculator on Calculatis — is completely free, with no registration, no download and no limit on how often you use it.