Wind Chill Calculator
Calculate wind chill temperature using the NWS formula. Enter air temperature and wind speed to get wind chill, frostbite risk time, and danger category. Metric support included.
°F
mph
Wind Chill
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Est. Frostbite Time —
Danger Category —
Extended More scenarios, charts & detailed breakdown ▾
°F
mph
Wind Chill
—
Frostbite Time —
Danger Category —
Feels Colder By —
Professional Full parameters & maximum detail ▾
°F / °C
mph / km/h
Wind Chill Results
Wind Chill (°F) —
Wind Chill (°C) —
Old Formula Wind Chill (°F) —
Risk Assessment
Frostbite Time —
Danger Category —
Heat Loss Rate Multiplier —
How to Use This Calculator
- Enter the air temperature in °F and wind speed in mph.
- The calculator shows wind chill, frostbite time estimate, and danger category.
- Use the Frostbite Risk tab for detailed exposure time limits at different wind chill levels.
- Use the Clothing Guide tab for layer recommendations based on wind chill range.
- Use the Professional tab for metric input, heat loss rate, and old vs new formula comparison.
Formula
Wind Chill (°F) = 35.74 + 0.6215T − 35.75(V^0.16) + 0.4275T(V^0.16)
T = air temperature (°F), V = wind speed (mph)
Valid for T ≤ 50°F and V ≥ 3 mph
T = air temperature (°F), V = wind speed (mph)
Valid for T ≤ 50°F and V ≥ 3 mph
Example
Example: T = 20°F, V = 30 mph. Wind Chill = 35.74 + 0.6215×20 − 35.75×(30^0.16) + 0.4275×20×(30^0.16) = 0.5°F.
Frequently Asked Questions
- Wind chill is the perceived decrease in air temperature felt by the body on exposed skin due to the flow of air. Wind increases the rate of heat loss from the body, making it feel colder than the actual temperature.
- This calculator uses the NWS (National Weather Service) formula: Wind Chill = 35.74 + 0.6215T − 35.75(V^0.16) + 0.4275T(V^0.16), where T is air temperature in °F and V is wind speed in mph.
- Frostbite can occur within 30 minutes when wind chill is −18°F or below. At −40°F or lower, frostbite can occur in under 10 minutes. At −60°F, frostbite risk is within 5 minutes.
- The NWS wind chill formula applies to air temperatures at or below 50°F (10°C) with wind speeds of 3 mph (5 km/h) or higher. Above these thresholds, wind chill equals the actual temperature.