Wind Chill Calculator
The NWS wind chill formula is only defined for temperatures at or below 50°F (10°C) and wind speeds above 3 mph (5 km/h) — outside that range, "feels like" wind chill isn't a meaningful concept.
Uses the official US National Weather Service / Environment Canada formula (2001), based on clinical trials of heat loss from exposed skin.
Free wind chill calculator using the official US National Weather Service / Environment Canada formula — enter temperature and wind speed to see the "feels like" temperature.
How it works
- Choose °F/mph or °C/km/h
- Enter the air temperature and wind speed
- See the wind chill ("feels like") temperature instantly
Frequently asked questions
Why doesn't wind chill show for warm temperatures?
The formula is only scientifically defined at 50°F (10°C) and below with wind above 3 mph (5 km/h) — outside that range, "wind chill" isn't a meaningful concept, and the calculator flags this instead of showing a made-up number.
Is this the same formula every weather service uses?
This uses the joint US NWS / Environment Canada formula from 2001, based on clinical trials of facial heat loss. Some other countries use different regional formulas, so results may not exactly match every weather service.
Related tools
From the blog
Update history
- 2026-09-02 Launched: wind chill calculator using the official NWS/Environment Canada formula, with a validity-range warning. Entirely client-side.