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See what the cold really feels like — official NWS wind chill plus frostbite risk time. Free, no signup.

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Wind Chill Calculator — What Does It Really Feel Like Outside?

A 0°F day with a 15 mph wind does not feel like 0°F — it feels like −19°F on exposed skin. Enter the temperature and wind speed to get the official National Weather Service wind chill, plus how fast frostbite can set in.

Current conditions

In degrees Fahrenheit. The wind chill formula applies at 50°F and below.

Sustained wind in miles per hour. Gusts make it feel colder, but the official wind chill uses sustained wind.

Leave blank if you already entered mph. Filling this in converts to mph automatically.

Feels like (wind chill)
−19°F
Air temperature 0°F · wind 15 mph
Feels-like difference
−19°
colder than the air temperature
In the other unit
−29°C
same wind chill, converted
Frostbite risk
30 min
exposed skin, per NWS guidance
Bundle up: At this wind chill, exposed skin can develop frostbite in about 30 minutes. Cover your face, ears, and hands, and limit time outdoors.
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All math happens in your browser. Your weather inputs are never uploaded or stored anywhere.

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No account, no email, no app. Open the page and check the wind chill in seconds.

Free forever

Unlimited wind chill checks with frostbite guidance — free, no limits.

How to use the wind chill calculator

  1. 1Pick your temperature unit

    Tap °F or °C, then type the current air temperature from your weather app or thermometer.

  2. 2Enter the wind speed

    Use the sustained wind in mph. If your forecast is in km/h, type it in the optional km/h box instead and it converts automatically.

  3. 3Read the feels-like temperature

    The headline number is the official NWS wind chill — how cold it feels on exposed skin.

  4. 4Check the frostbite time

    Use the frostbite guidance to decide how long exposed skin can safely stay out, and dress accordingly.

Why winter travelers use this calculator

Official NWS formula

Uses the exact wind chill equation the National Weather Service uses, not a rough guess — valid for temperatures at or below 50°F and winds from 3 to 110 mph.

Fahrenheit and Celsius

Enter the temperature in °F or °C and see the result in both, so US and international forecasts both work.

mph and km/h wind

Wind speed in mph or km/h — handy when a forecast, car display, or weather station reports metric units.

Frostbite time guidance

Translates the wind chill into plain guidance: how quickly exposed skin can develop frostbite, based on NWS frostbite times.

Feels-like difference

Shows exactly how many degrees colder the wind makes it feel, so you can judge whether one more layer is enough.

Works on your phone

Check it at the door before a walk, a run, or the school run — fully responsive and touch-friendly.

Wind chill calculator FAQs

What is wind chill?
Wind chill is how cold the air feels on exposed skin when wind strips away the thin layer of warm air your body heats around itself. It is not a real temperature — a thermometer still reads the air temperature — but it measures how fast your skin loses heat.
What is the wind chill at 0°F with a 15 mph wind?
About −19°F. Using the NWS formula, 0°F with a 15 mph wind gives a wind chill of −19.4°F, which rounds to −19°F. At that level, exposed skin can develop frostbite in about 30 minutes.
What is the wind chill formula?
The National Weather Service formula is: wind chill = 35.74 + 0.6215T − 35.75V0.16 + 0.4275TV0.16, where T is the air temperature in Fahrenheit and V is the wind speed in mph. It is valid for temperatures at or below 50°F and winds between 3 and 110 mph.
When does wind chill not apply?
Above 50°F, wind chill is not calculated — wind at warm temperatures does not make you feel meaningfully colder in the same way. Below 3 mph, the air is effectively calm, so the wind chill equals the air temperature. This calculator handles both cases for you.
How fast can frostbite happen?
Per NWS guidance, frostbite can occur in about 30 minutes at a wind chill near −19°F, about 15 minutes near −25°F, about 10 minutes near −35°F, and about 5 minutes at −50°F or colder. Times are approximate and depend on clothing, wet skin, and individual factors.
Does wind chill affect cars, pipes, or pets?
Wind chill does not drop inanimate objects below the actual air temperature — a car radiator at 20°F stays 20°F no matter the wind. Wind only makes objects cool to the air temperature faster. Pets, however, lose body heat like people do, so wind chill matters for them too.
Is wind chill the same as the "feels like" temperature in summer?
No. In winter, "feels like" is the wind chill, driven by wind. In summer, "feels like" is the heat index, driven by humidity. This calculator covers the winter side only.

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