Wind Chill Calculator
Free online wind chill calculator. Enter air temperature and wind speed to get the cold-weather "feels-like" temperature using the NWS and Environment Canada wind chill formula. Supports Fahrenheit/Celsius and mph/km/h with a color-coded frostbite risk level. 100% client-side.
Loading tool...
What is Wind Chill Calculator?
Wind chill (wind chill temperature, WCT) is the apparent "feels-like" temperature that tells you how cold it actually feels when wind speed is combined with the air temperature. Because wind constantly strips away the thin layer of warm air next to your skin, a cold and windy day feels far colder than the thermometer suggests. This free online wind chill calculator uses the joint U.S. National Weather Service and Environment Canada formula adopted in 2001, the international standard for cold-weather apparent temperature, and it classifies every result into a color-coded frostbite risk level. Switch between Fahrenheit and Celsius, and between mph and km/h, enter an air temperature and wind speed, and get an instant feels-like temperature plus a built-in reference table of frostbite risk. Everything runs 100% client-side in your browser.
Key Benefits
- Reports the true apparent temperature so you can judge real cold-weather danger
- Uses the official NWS / Environment Canada wind chill formula (WCT index)
- Color-coded frostbite risk level from low to severe with time-to-frostbite guidance
- Switch between °F/°C and mph/km/h with live value conversion
- Private and offline-capable; no weather data leaves your device
Common Use Cases
- •Dressing for outdoor activities like hiking, skiing, or commuting in cold and windy weather
- •Deciding when to cancel or limit outdoor work to prevent frostbite and hypothermia
- •Checking conditions for vulnerable people such as children and the elderly
- •Comparing the "feels-like" temperature reported by different weather apps
- •Teaching or learning how wind affects perceived temperature and heat loss
How to Use the Wind Chill Calculator
- Pick temperature and speed units: Toggle between Fahrenheit (°F) and Celsius (°C) for temperature, and between mph and km/h for wind speed. If you switch after typing, the values are converted automatically.
- Enter the air temperature: Type the ambient (shade) temperature measured in the open air. Wind chill applies to temperatures at or below 50°F (10°C).
- Enter the wind speed: Provide the wind speed measured about 1.5 meters (5 feet) off the ground — the standard height for weather observations. Wind chill applies only above 3 mph (4.8 km/h).
- Read the result: The large value is the apparent "feels-like" temperature with a color-coded frostbite risk level. Copy the summary or consult the risk table for guidance.
Key Features
- Official NWS / Environment Canada wind chill formula (WCT index)
- Toggle between °F/°C and mph/km/h with live value conversion
- Color-coded frostbite risk level (low to severe) with time guidance
- Smart range validation warns when the formula does not apply
- Copy a one-line summary for reports, logs, or social posts