Calculateur de Heat Index
Estimate heat index from temperature and relative humidity.
Formula and method
This calculator computes Heat index directly in your browser without sending data to an external server.
Mathematical formula
- Heat index:
-42.379+2.04901523 × t+10.14333127 × rh-0.22475541 × t × rh-0.00683783 × t × t-0.05481717 × rh × rh+0.00122874 × t × t × rh+0.00085282 × t × rh × rh-0.00000199 × t × t × rh × rh
Variables and parameters
- Temperature (t): default value 90 °F.
- Relative humidity (rh): default value 60 %.
Some formulas are undefined for certain input combinations (such as division by zero or logarithms of non-positive numbers). In those cases the live tool displays an alert instead of NaN.
Embed this tool
Paste this snippet into your own site or blog post to embed a live, working copy of this tool. It links back to the full page on SpecWhale.
Frequently asked questions
What equation and variables does Heat Index Calculator use?
Heat Index Calculator evaluates outputs such as <strong>Heat index</strong> based on inputs including Temperature, Relative humidity. Check the Mathematical Method section for the explicit formula.
What should I keep in mind when interpreting Heat Index Calculator metrics?
Health and body calculators provide general estimates derived from standard population equations. Individual physiological differences (such as muscle mass or hydration) can alter personal results.
What happens if I enter invalid or zero values into Heat Index Calculator?
If an input combination is mathematically undefined (such as division by zero or negative square roots), SpecWhale alerts you gracefully rather than returning invalid NaN outputs.
Are my calculations in Heat Index Calculator saved or private?
All calculations are 100% private and run locally in your Web browser. Your numbers are never uploaded to any server, but can be saved locally to your device or exported as CSV/JSON.
Is Heat Index Calculator free to use?
Yes. Heat Index Calculator is completely free, has no usage limit, and does not require an account, email, or API key.
Does Heat Index Calculator store or upload my data?
No. Heat Index Calculator calculates everything locally in your browser. Nothing you type is sent to a server or stored by SpecWhale.
How accurate is Heat Index Calculator?
Heat Index Calculator uses a standard formula (see the Method section above for the exact expression). For high-stakes financial, medical, or legal decisions, confirm the result with a professional or an authoritative source before relying on it.
Can I embed Heat Index Calculator on my own website?
Yes. Use the "Embed this tool" snippet on this page to add a free, working copy of Heat Index Calculator to your own blog post or page.