Weather
Wind Chill Calculator
Estimate how cold it actually feels by combining air temperature with wind speed in mph or km/h—essential for winter running, hiking, or job-site planning.
Factor wind speed into cold air readings to estimate frostbite risks.
Wind chill equation
Wind chill (°F) = 35.74 + 0.6215T − 35.75V^0.16 + 0.4275T·V^0.16 (valid when T ≤ 50°F and V ≥ 3 mph).
Inputs are Fahrenheit (automatically converted from °C if needed) and wind speed in mph (converted from km/h).
How to use
- Enter air temperature in °F or °C.
- Provide wind speed in mph or km/h (must be ≥ 3 mph for the formula to apply).
- Read the feels-like value plus cold-risk guidance such as "frostbite in 30 minutes."
Example
Input: Temperature = 20°F, Wind = 15 mph
Output: Wind chill ≈ 6°F (−14°C) with frostbite risk inside 30 minutes
FAQ & notes
Why does the calculator stop changing above 50°F?
The official wind chill formula is only defined for air temperatures up to 50°F (10°C). Above that, convection has little effect so it simply reports the air temperature.
Does humidity factor in?
Wind chill only considers wind speed and air temperature. Use the heat index calculator when humidity drives discomfort instead.