Wind Chill Calculator
Find the wind chill — how cold the air feels once wind is factored in — from temperature and wind speed, in °F or °C. Calculates in your browser.
Feels like
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Show the math
The US National Weather Service wind chill combines temperature and wind speed:
WC = 35.74 + 0.6215T − 35.75V0.16 + 0.4275T·V0.16
T is in °F and V in mph; Celsius inputs are converted internally. The formula applies only at or below 50°F and above 3 mph. All math runs locally in your browser.
What this does
The wind chill calculator finds how cold the air actually feels once wind is taken into account, using the US National Weather Service formula. Wind strips warmth from your skin, so the felt temperature is lower than the thermometer reads.
How to use it
- Choose Fahrenheit or Celsius.
- Enter the air temperature.
- Enter the wind speed.
- Read the wind chill (feels-like) temperature.
How it works
The NWS formula combines temperature T (°F) and wind speed V (mph). It is defined for temperatures at or below 50°F and winds above 3 mph; outside that range wind chill is not meaningful. Celsius inputs are converted internally.
WC = 35.74 + 0.6215T − 35.75V⁰·¹⁶ + 0.4275T·V⁰·¹⁶
Understanding your result
Wind chill is what matters for frostbite and hypothermia risk, not the raw temperature — the lower it drops, the faster exposed skin can freeze. The formula only applies in cold, windy conditions (at or below 50°F and above 3 mph); in milder or calm weather it is not meaningful, and in heat you want the heat index instead.
Example
At 20°F with a 20 mph wind, the air feels like about 4°F.
Sources & methodology
Last updated .
Frequently asked questions
What is wind chill?
It is how cold the air feels on exposed skin once wind is factored in. Wind carries heat away faster, so the felt temperature is lower than the thermometer reading.
When does wind chill apply?
The formula is defined for temperatures at or below 50°F (10°C) and wind speeds above 3 mph. In warmer or calmer conditions it is not meaningful.
Does wind chill affect objects?
No — wind chill describes heat loss from a warm body. It speeds cooling but cannot push an object below the actual air temperature.
Is my data stored?
No. Everything is calculated locally in your browser.
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