Wind Chill Calculator
Estimate the “feels like” temperature (wind chill) based on the actual air temperature and wind speed.
| Air temperature | |
| Wind speed |
Result
Your wind chill estimate will appear here.
Formula (U.S. National Weather Service)
Wind Chill (°F) = 35.74 + 0.6215T − 35.75V0.16 + 0.4275TV0.16
Where T is the air temperature in °F and V is the wind speed in mph (measured at 5 ft / standard anemometer height).
Applicability and assumptions
The NWS wind chill formula is intended for cold conditions: air temperature at or below 50°F (10°C) and wind speed above 3 mph (about 4.8 km/h). Outside those ranges, wind chill is not a meaningful measure and this calculator will show a notice along with the raw result.
Wind chill estimates the rate of heat loss from exposed skin; it does not change the actual air temperature or affect objects the way it affects people and animals. Frostbite and hypothermia risk depend on exposure time, clothing, moisture, and health — take precautions in cold, windy weather.
How it works
Wind chill estimates how cold it feels on exposed skin when wind increases heat loss. It’s meant for cold, windy conditions, not every situation.
Formula (NWS)
- °F & mph: WC = 35.74 + 0.6215T − 35.75V0.16 + 0.4275T·V0.16
- °C & km/h: WC = 13.12 + 0.6215T − 11.37V0.16 + 0.3965T·V0.16
Worked example
20°F with 15 mph wind → wind chill about 6°F.
Assumptions & safety
- Best for T ≤ ~50°F (10°C) and wind > ~3 mph (5 km/h). It affects perceived cold/frostbite risk, not the air temperature. Dress for conditions and follow official weather guidance.
Estimate for general information only. Wind chill does not measure actual air temperature and frostbite risk depends on exposure time and conditions.
How to use the Wind Chill Calculator
It takes a few seconds, and every figure is calculated in your browser.
- Enter the air temperature.
- Enter the wind speed.
- Press Calculate — the result appears in the dark panel beside the form.
- Use Copy, CSV, Share or Print under the result if you want to keep it.
Wind Chill Calculator — frequently asked questions
What formula does the Wind Chill Calculator use?
Wind Chill (°F) = 35.74 + 0.6215T − 35.75V 0.16 + 0.4275TV 0.16 Where T is the air temperature in °F and V is the wind speed in mph (measured at 5 ft / standard anemometer height).
How does the Wind Chill Calculator work?
Wind chill estimates how cold it feels on exposed skin when wind increases heat loss. It’s meant for cold, windy conditions, not every situation.
What assumptions and limitations should I know about?
The NWS wind chill formula is intended for cold conditions: air temperature at or below 50°F (10°C) and wind speed above 3 mph (about 4.8 km/h). Outside those ranges, wind chill is not a meaningful measure and this calculator will show a notice along with the raw result. Wind chill estimates the rate of heat loss from exposed skin; it does not change the actual air temperature or affect objects the way it affects people and animals.
Can you walk through a worked example?
20°F with 15 mph wind → wind chill about 6°F.
Last updated 10 November 2026 · Formula, worked example and assumptions are documented above, and every result is calculated in your browser.