Wind Chill Index Calculator

Calculate Celsius wind chill feels-like temperature from air temperature and wind speed.

1.0M uses Updated · 2026-05-24 Runs locally · zero upload
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How to Use Wind Chill Index Calculator

Enter air temperature in Celsius and wind speed in kilometers per hour. The calculator applies the official-style wind chill equation only when the temperature is 10°C or lower and wind speed is above 4.8 km/h; outside that range, it warns that the formula is not appropriate.

Formula & Theory - Wind Chill Index Calculator

The Celsius wind chill equation is:

WCI = 13.12 + 0.6215T - 11.37V^0.16 + 0.3965T V^0.16

T is air temperature in °C and V is wind speed in km/h. The two V^0.16 terms make the effect of wind nonlinear: each additional km/h matters, but not by the same amount across the whole scale. When the inputs are outside the standard range, the calculator returns the air temperature with a warning instead of pretending the formula still applies.

Use Cases for Wind Chill Index Calculator

  • Winter commuting - Estimate how cold exposed skin may feel on windy days.
  • Worksite safety - Screen cold and windy conditions before outdoor tasks.
  • Weather lessons - Show the nonlinear effect of wind speed in the WCI formula.

Wind chill describes exposed-skin cooling; clothing, sun, humidity, and activity can make personal comfort different from the number.

Frequently asked questions about Wind Chill Index Calculator

When is the wind chill formula valid?

It is intended for air temperature at or below 10°C and wind speed above 4.8 km/h.

Why does wind speed use an exponent?

The 0.16 exponent reflects the nonlinear cooling effect of wind on exposed skin.

Is my data stored?

No. All calculations happen in your browser; nothing is sent to a server.