Calculate the apparent temperature from wind chill or heat index.
Calculated locally in your browser.
How is the feels-like temperature calculated?
Wind chill (≤10°C) uses the Environment Canada/NWS formula with temperature and wind speed, while heat index (≥27°C) uses the NWS Rothfusz regression with temperature and humidity. For example, −5°C with a 20 km/h wind feels like about −11°C, and 32°C with 70% humidity feels much hotter than the thermometer reads.
Understanding your result
Wind chill matters in the cold (wind strips body heat); heat index matters in the heat (humidity slows sweat evaporation). In mild conditions it feels close to the actual temperature.
Formula and method
Wind chill (≤10°C) uses the Environment Canada/NWS formula with temperature and wind speed. Heat index (≥27°C) uses the NWS Rothfusz regression with temperature and humidity.
Worked example
At −5°C with a 20 km/h wind it feels like about −11°C; at 32°C with 70% humidity it feels much hotter than the thermometer reads.
How to use this tool
- Choose metric or imperial units.
- Enter the temperature, wind speed and humidity.
- Press Calculate.
About the Feels-Like Temperature Calculator
The Feels-Like Temperature Calculator shows how cold or hot it actually feels by applying the wind chill formula in cold weather and the heat index in hot, humid weather.
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Frequently asked questions
Which formula does it use?
It picks automatically: wind chill when it’s cold and windy, heat index when it’s hot and humid, otherwise the actual temperature.