Find how cold it really feels. This free wind chill calculator combines air temperature and wind speed (°F/mph or °C/km/h) using the NWS formula, with the feels-like temperature and frostbite-risk notes.
Wind chill describes how cold it feels on exposed skin from the combined effect of cold and wind. The standard formula applies when it’s cold and breezy — roughly at or below 50 °F (10 °C) with wind above 3 mph (5 km/h). In severe cold, frostbite can occur quickly, so dress for the feels-like temperature.
Conditions
°F
mph
Enter the air temperature and wind speed. Wind chill is most meaningful in cold, windy conditions; outside that range it’s shown as an approximation.
Feels like
—
Enter temperature and wind
Wind chill
—
Difference
—
In °F
—
In °C
—
Based on the US National Weather Service wind chill formula. Wind chill affects how quickly exposed skin loses heat; it does not lower the temperature of objects below the actual air temperature.
Use this free wind chill calculator to find how cold it really feels. Enter the air temperature and wind speed — in °F/mph or °C/km/h — to get the wind chill “feels-like” temperature.
What this wind chill calculator does
A wind chill calculator combines cold air and wind into a single feels-like figure. Wind strips away the thin layer of warmth around your skin, so a breezy 30 °F can feel more like 17 °F.
The wind chill formula
°F: 35.74 + 0.6215T − 35.75V^0.16 + 0.4275·T·V^0.16
(T in °F, V in mph; valid at T ≤ 50 °F and V > 3 mph)
So 30 °F with a 20 mph wind feels like about 17 °F, and 0 °F with 15 mph feels like roughly −19 °F.
Wind chill at a glance (°F)
Air temp
5 mph
20 mph
40 mph
30 °F
25
17
13
10 °F
1
−9
−15
−10 °F
−22
−35
−43
Why wind chill matters
Wind chill predicts how fast exposed skin loses heat and how quickly frostbite can set in. It doesn’t cool objects below the actual air temperature, but for people and animals the feels-like figure is what to dress for.
How to use the wind chill calculator
Choose °F/mph or °C/km/h.
Enter the air temperature and wind speed.
Read the feels-like temperature and any cold-risk note.
Wind Chill FAQ
How is wind chill calculated?
The NWS formula combines air temperature and wind speed: 35.74 + 0.6215T − 35.75V^0.16 + 0.4275·T·V^0.16 (°F and mph). So 30 °F with 20 mph feels like about 17 °F.
What temperature range does wind chill apply to?
It's defined for cold, breezy conditions — at or below 50 °F (10 °C) with wind above 3 mph (5 km/h). Outside that, the feels-like is close to the actual temperature.
Does wind chill affect objects?
No. Wind chill describes heat loss from warm skin, so it applies to people and animals — it can't cool an object below the actual air temperature.
When is wind chill dangerous?
The colder the feels-like, the faster frostbite sets in. At extreme wind chills, exposed skin can be affected in minutes, so cover up and limit time outside.
Can I use Celsius and km/h?
Yes. Switch units and the calculator applies the metric version of the formula automatically.
Is the wind chill calculator free?
Yes, this wind chill calculator is completely free, needs no sign-up, and gives instant results in your browser.
