Calculate wind chill from air temperature and wind speed using the National Weather Service wind chill equation. Supports Celsius, Fahrenheit, mph, km/h, m/s and knots.
Fill in the details and click Calculate to see your results.
Wind chill describes how cold the air feels because moving air increases heat loss from exposed skin.
It is not the actual air temperature and does not mean that the air itself has reached the calculated wind chill temperature.
This calculator uses the North American wind chill equation used by the U.S. National Weather Service.
The formula assumes conditions representative of the standard wind chill model and is intended for human cold-exposure interpretation.
| Air Temperature | -17.7778 |
| Temperature Unit | Celsius (°C) |
| Wind Speed | 24.1402 |
| Wind Speed Unit | km/h |
| Wind Chill (°F) | -19.398 |
| Wind Chill (°C) | -28.5545 |
| Wind Speed (mph) | 15 |
| Cooling Difference (°F) | 19.398 |
| Cooling Difference (°C) | 10.7767 |
| Official Formula Range Valid (1 = Yes, 0 = No) | 1 |
At 0°F with a 15 mph wind, the NWS wind chill is approximately -19°F.
Try this example →| Air Temperature | -6.6667 |
| Temperature Unit | Celsius (°C) |
| Wind Speed | 16.0934 |
| Wind Speed Unit | km/h |
| Wind Chill (°F) | 8.85398 |
| Wind Chill (°C) | -12.8589 |
| Wind Speed (mph) | 9.99998 |
| Cooling Difference (°F) | 11.146 |
| Cooling Difference (°C) | 6.1922 |
| Official Formula Range Valid (1 = Yes, 0 = No) | 1 |
At 20°F and 10 mph, the estimated wind chill is about 10°F.
Try this example →| Air Temperature | -5 |
| Temperature Unit | Celsius (°C) |
| Wind Speed | 20 |
| Wind Speed Unit | km/h |
| Wind Chill (°F) | 11.2468 |
| Wind Chill (°C) | -11.5296 |
| Wind Speed (mph) | 12.4274 |
| Cooling Difference (°F) | 11.7532 |
| Cooling Difference (°C) | 6.52956 |
| Official Formula Range Valid (1 = Yes, 0 = No) | 1 |
Enter temperature and wind speed in metric units and the calculator converts them internally before applying the NWS formula.
Try this example →Wind chill describes the increased rate of heat loss from exposed skin caused by cold temperatures and moving air.
It uses the North American wind chill equation used by the U.S. National Weather Service.
No. Wind chill is an apparent-temperature index describing how cold conditions can feel to exposed skin.
Moving air removes heat from exposed skin more rapidly, increasing the rate of heat loss.
Yes. The calculator accepts Celsius and converts it to Fahrenheit internally before applying the standard NWS equation.
The NWS defines it for air temperatures at or below 50°F and wind speeds above 3 mph.
Under the intended cold and windy conditions the wind chill is generally below the actual air temperature. Outside the official formula range, this calculator reports the actual temperature instead.