Calculate the wind chill index to know how cold it really feels outside. Enter temperature and wind speed to get the perceived temperature and frostbite risk level. Free online tool.
This free online wind chill calculator uses the official wind chill formula adopted by meteorological agencies worldwide. It calculates how cold the air feels on exposed skin by combining the actual air temperature with wind speed. The result helps you understand frostbite risk and plan outdoor activities safely.
Wind chill is the perceived decrease in air temperature felt by the body on exposed skin due to the flow of air. Higher wind speeds make the air feel colder than the actual thermometer reading.
This calculator uses the official wind chill formulas adopted by the US National Weather Service and Environment Canada. It is accurate for temperatures at or below 10°C (50°F) and wind speeds above 4.8 km/h (3 mph).
Frostbite can occur when wind chill drops below -25°C (-13°F). At -40°C (-40°F), frostbite can happen in just 10 minutes on exposed skin.
Wind chill only affects living things with skin. Inanimate objects like cars or water pipes cool to the actual air temperature, not the wind chill temperature.