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Wind Chill Calculator

How cold it feels, and frostbite risk at that temperature.

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Frostbite risk

Wind chill chart

Feels like

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Details

Wind chill (°C)—
Wind chill (°F)—
Difference from air—
Frostbite time—

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What this level of cold calls for

Wind chill describes how fast moving air strips heat from exposed skin. It does not lower the air temperature, so nothing will freeze below the actual air temperature no matter how hard the wind blows. The formula is valid at or below 10 °C with wind above about 4.8 km/h.

Quick Tool Overview

The Wind Chill Calculator uses the 2001 formula adopted by the US National Weather Service and Environment Canada to find the equivalent still-air temperature, and reports the frostbite risk and exposure time that go with it.

What it does
Calculates wind chill and frostbite risk
You give it
Air temperature and wind speed
You get back
Wind chill in both scales, plus exposure time
Best for
Winter outdoor work, running and travel planning
Calculators Free, unlimited use No sign-up Runs in your browser

About the Wind Chill Calculator

Calculate the wind chill temperature from air temperature and wind speed, using the 2001 formula adopted by the US National Weather Service and Environment Canada. Frostbite risk and the exposure time that goes with it are reported alongside.

Wind chill quantifies how quickly moving air strips heat from exposed skin: the wind does not lower the air temperature, but it removes the thin insulating layer of warmed air next to your body, so heat is lost far faster. That distinction matters practically — your car will not freeze at a wind chill of −20 if the air is +2, but your fingers are at genuine risk. The formula applies only at or below 10 °C with wind above about 4.8 km/h.

Key features of the Wind Chill Calculator

The official 2001 formula

The version adopted by the NWS and Environment Canada, not the superseded 1945 one.

Frostbite exposure times

How long exposed skin can be out before frostbite becomes a real risk.

Says what wind chill is not

Wind cannot cool anything below air temperature — your car will not freeze at a wind chill of −20 in +2 air.

Validity range stated

The formula applies at or below 10 °C with wind above 4.8 km/h, and the page says so.

Full chart

A temperature-by-wind-speed grid, with the risk bands shaded.

How to use the Wind Chill Calculator

  1. 1

    Enter the air temperature

    In Celsius or Fahrenheit. The formula applies at or below 10 °C.

  2. 2

    Enter the wind speed

    In km/h, mph or m/s, measured at the standard 10 metre height.

  3. 3

    Read the wind chill

    The equivalent still-air temperature, in both scales.

  4. 4

    Check the frostbite risk

    The time exposed skin can be out before frostbite becomes a danger.

Frequently asked questions

The equivalent still-air temperature that would strip heat from exposed skin at the same rate as the actual temperature and wind combined. It describes heat loss, not air temperature.

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