How does the Heat Index Calculator work?

Calculate heat index from temperature and humidity. The tool calculates an estimate from the values entered.

Can I copy the result?

Yes. Use the Copy Result button to copy the current result summary.

Weather

Calculate heat index from temperature and humidity.

Primary Result -

Secondary Result -

Additional Result -

Formula

NOAA heat index regression for Fahrenheit and relative humidity

► Necessary Cookies Always Active

Necessary cookies enable essential site features like secure log-ins and consent preference adjustments. They do not store personal data.

► Functional Cookies Remark

Functional cookies support features like content sharing on social media, collecting feedback, and enabling third-party tools.

► Analytical Cookies Remark

Analytical cookies track visitor interactions, providing insights on metrics like visitor count, bounce rate, and traffic sources.

► Advertisement Cookies Remark

Advertisement cookies deliver personalized ads based on your previous visits and analyze the effectiveness of ad campaigns.