Calculate real-feel temperature from air temperature and wind speed.. No account needed — all processing happens locally in your browser and your input is never transmitted.
Below 4.8 km/h (3 mph) wind chill isn’t applied — the standard treats that as still air — and the result is colour-coded against the official frostbite-risk thresholds (uncomfortable, very cold, frostbite in 30 / 10 / 5 minutes). Switch between °C/km/h and °F/mph with one click; the formula uses the appropriate constants for each system.
The 2001 Joint Action Group for Temperature Indices formula adopted by Environment Canada and the US National Weather Service: T_wc = 13.12 + 0.6215·T − 11.37·V^0.16 + 0.3965·T·V^0.16 (with T in °C and V in km/h). The Fahrenheit formula uses the equivalent constants in °F and mph.
Below 4.8 km/h (3 mph) wind has negligible cooling effect, so the standard says to report air temperature unchanged. The tool clamps to that rule automatically.
With sustained wind, exposed skin can frostbite in 10–30 minutes around −28 °C and in 5–10 minutes below −40 °C. The colour-coded risk band on the result reflects these official NWS thresholds.
No — the formula runs entirely in your browser. Nothing about your location or temperature is sent anywhere.
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