Wind Chill Calculator
Enter the air temperature and wind speed to get the wind chill — the feels-like temperature in degrees Celsius — using the official Environment Canada and US National Weather Service formula.
Feels-like temperature, instantly
Enter the air temperature in °C and the wind speed in km/h and the calculator returns the wind chill — how cold it actually feels on exposed skin.
Use metric units
Temperature in degrees Celsius and wind speed in kilometres per hour. This is the metric wind chill index used by weather services worldwide.
What is wind chill?
The temperature it actually feels like
A wind chill calculator turns two readings — the air temperature and the wind speed — into the temperature it actually feels like on your skin. Wind strips away the thin layer of warm air your body heats around itself, so a windy −5 °C day can feel far colder than a still −5 °C day. The wind chill index expresses that cooling as an equivalent temperature: if the thermometer reads 0 °C but it feels like −5 °C in the wind, the wind chill is −5 °C. It is the number behind frostbite warnings, "dress for −10 °C" advice, and the feels-like figure on every weather app.
Enter the air temperature in °C and the wind speed in km/h to get the feels-like wind chill temperature instantly.
The metric wind chill index combines the air temperature T (°C) and the wind speed v (km/h) raised to the power 0.16:
WC = 13.12 + 0.6215·T − 11.37·v^0.16 + 0.3965·T·v^0.16Raising the wind speed to the power 0.16 makes the first gusts matter most: going from calm to a light breeze drops the feels-like temperature sharply, while extra wind beyond that has a smaller effect. The colder the air, the more each km/h of wind bites — which is why the temperature term and the wind term are multiplied together in the final part of the formula.
The formula is the official standard, but it is only defined for a specific range of conditions.
Valid range and what it ignores
The standard wind chill index is defined for an air temperature of 10 °C or below and a wind speed of 4.8 km/h or higher. This calculator still returns a value outside that range, but treat it as an approximation — at warm temperatures or in near-calm air the index has no real physical meaning. It also assumes exposed skin in the shade and ignores sunshine, humidity, and how warmly you are dressed, so the felt temperature can differ in practice.