Wind Chill Calculator
Wind makes cold air feel colder. Enter the air temperature and wind speed — the feels like temperature, the frostbite risk level and cold exposure guidance appear instantly.
Guidance
How to use
- Choose metric or imperial units.
- Enter the current air temperature and wind speed.
- Read the feels like temperature and follow the guidance for your frostbite risk level.
Note: The formula is designed for temperatures at or below 10°C (50°F) and wind speeds above 5 km/h (3 mph). Calm wind gives a wind chill equal to the air temperature. This is an estimate.
Tips
- Dress in layers and cover exposed skin when the wind chill is low.
- Wet clothing loses heat fast — change into dry clothes when possible.
- Children and elderly people lose body heat faster and need shorter outdoor time.
- Watch for white or gray patches on skin — an early sign of frostbite.
Frequently Asked Questions (FAQ)
What is wind chill?
Wind chill is the temperature the human body feels on exposed skin when wind increases heat loss from the air temperature alone.
How is wind chill calculated?
This tool uses the official formula of the US National Weather Service, based on research on heat transfer from the human face in cold wind.
At what wind chill does frostbite occur?
Frostbite can occur within 30 minutes when the wind chill falls below 0°F (-18°C), and in about 10 minutes below -20°F (-29°C).
What inputs does the wind chill calculator need?
Just the air temperature and the wind speed. You can switch between metric (°C, km/h) and imperial (°F, mph) units.
When is the wind chill formula valid?
The formula is designed for temperatures at or below 10°C (50°F) and wind speeds above 5 km/h (3 mph). With calm wind, the wind chill simply equals the air temperature.