Wind Chill Calculator
Calculate the felt temperature by combining the real temperature with wind speed.
Tip: With a wind chill below -27°C, frostbite can occur within 10–30 minutes — cover any exposed skin.
Did this tool help?
About this digital tool
The wind chill index calculator shows how cold the weather feels when temperature and wind speed combine. Enter the temperature in °C and the wind in km/h and get the felt temperature together with an assessment of the risk of frostbite.
The formula uses the Canadian/American model: 13.12 + 0.6215 × T − 11.37 × v^0.16 + 0.3965 × T × v^0.16. It is valid for temperatures up to 10°C and wind above 4.8 km/h; outside this range the tool tells you the result is not reliable. It is useful for mountaineers, skiers, walkers and anyone who needs to dress properly on cold, windy days.
How to use
- Enter the current temperature (°C)
- Enter the wind speed (km/h)
- See the felt temperature (the wind chill index)
- See the time to skin frostbite
- See the clothing tips
Frequently asked questions
How is the wind chill index calculated?
The NWS formula (2001): WC = 13.12 + 0.6215T - 11.37V^0.16 + 0.3965TV^0.16, where T = temp (°C) and V = wind speed (km/h). It applies when T ≤ 10°C and V ≥ 4.8 km/h.
When is wind chill dangerous?
-18°C to -27°C: frostbite risk in 30 min. -28°C to -39°C: frostbite risk in 10–30 min. -40°C to -47°C: frostbite risk in 5–10 min. Below -48°C: risk within a few minutes.
Does humidity have an effect?
The standard wind chill formula doesn't include humidity directly. For the effect of humidity, see the heat index or the 'wet bulb' temperature.
When doesn't the wind chill index apply?
The formula applies to temperatures up to 10°C and wind of at least 4.8 km/h. Outside this range the tool shows a warning that the result is outside its validity.