Wind Chill Calculator
Calculate wind chill instantly in your browser — the published formula, worked locally with no data sent anywhere.
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What this tool does
Calculate wind chill instantly in your browser — the published formula, worked locally with no data sent anywhere. Valid for T ≤ 50 °F and wind ≥ 3 mph at standard 33 ft anemometer height, adjusted to face level. Wind chill applies to exposed skin of a walking person; objects cool to air temperature, never below it.
How to use the Wind Chill Calculator
- Enter or select air temperature (°f).
- Enter or select wind speed (mph).
- Read the calculated result; change any measurement to compare alternatives.
Formula
NWS wind chill: WC = 35.74 + 0.6215·T − 35.75·V^0.16 + 0.4275·T·V^0.16, with T in °F and V in mph (the 2001 NWS / Environment Canada formula).
- temp
- Air temperature (°F)
- wind
- Wind speed (mph)
Valid for T ≤ 50 °F and wind ≥ 3 mph at standard 33 ft anemometer height, adjusted to face level. Wind chill applies to exposed skin of a walking person; objects cool to air temperature, never below it.
Worked example
For wind chill calculator, the following measurements illustrate the exact method: Air temperature (°F): 30; Wind speed (mph): 20.
Inputs
- Air temperature (°F)30
- Wind speed (mph)20
Result
- Wind chill (°F)17.36
- Wind chill (°C)-8.13
- Cooling effect of the wind (°F)12.64
- Frostbite guidance (NWS)Hypothermia risk if wet or exposed for long periods
Results explained
- Wind chill (°F)
- Wind chill (°F) from the formula above. Valid for T ≤ 50 °F and wind ≥ 3 mph at standard 33 ft anemometer height, adjusted to face level. Wind chill applies to exposed skin of a walking person; objects cool to air temperature, never below it.
- Wind chill (°C)
- Wind chill (°C) from the formula above. Valid for T ≤ 50 °F and wind ≥ 3 mph at standard 33 ft anemometer height, adjusted to face level. Wind chill applies to exposed skin of a walking person; objects cool to air temperature, never below it.
- Cooling effect of the wind (°F)
- Cooling effect of the wind (°F) from the formula above. Valid for T ≤ 50 °F and wind ≥ 3 mph at standard 33 ft anemometer height, adjusted to face level. Wind chill applies to exposed skin of a walking person; objects cool to air temperature, never below it.
- Frostbite guidance (NWS)
- Frostbite guidance (NWS) from the formula above. Valid for T ≤ 50 °F and wind ≥ 3 mph at standard 33 ft anemometer height, adjusted to face level. Wind chill applies to exposed skin of a walking person; objects cool to air temperature, never below it.
Frequently asked questions
NWS wind chill: WC = 35.74 + 0.6215·T − 35.75·V^0.16 + 0.4275·T·V^0.16, with T in °F and V in mph (the 2001 NWS / Environment Canada formula).
Valid for T ≤ 50 °F and wind ≥ 3 mph at standard 33 ft anemometer height, adjusted to face level. Wind chill applies to exposed skin of a walking person; objects cool to air temperature, never below it.
No. Wind only speeds cooling toward the air temperature; it cannot push anything below the actual air temperature. Pipes freeze when the air itself is below freezing.
Every field is labelled with its unit — enter values in exactly the labelled unit and read the result in the labelled output unit. Fields with a unit symbol also support the site-wide imperial/metric switch, which converts before the formula runs.
It uses double-precision arithmetic and the published constants and formulas named on this page. The last displayed digit may be rounded, and real conditions can differ from the idealized model described in the assumptions.
Yes. Every calculation runs entirely in your browser; nothing you enter is uploaded, stored or shared.