Enter temperature, wind speed, humidity, then click Calculate.

Effective temperature is the perceived temperature that the human body feels, taking into account environmental factors beyond the actual air temperature. Two main calculations are used: wind chill for cold conditions and heat index for hot conditions. Wind chill measures the cooling effect of wind on exposed skin, calculated using the formula T_wc = 13.12 + 0.6215·T - 11.37·V^0.16 + 0.3965·T·V^0.16, where T is air temperature and V is wind speed. The heat index (or apparent temperature) measures how hot it feels when humidity is combined with high temperatures, using the Rothfusz regression equation. Both indices help assess the risk of hypothermia or heat-related illnesses. This calculator automatically selects the appropriate formula based on conditions and provides the effective temperature, helping you understand the true thermal comfort level for outdoor activities, work safety, and health precautions.

1. Enter the Actual Temperature in degrees Celsius.
2. Enter the Wind Speed in km/h (for wind chill calculations).
3. Enter the Relative Humidity as a percentage (for heat index).
4. Select Wind Chill for cold conditions or Heat Index for hot conditions.
5. Click Calculate Effective Temperature to get the perceived temperature.
6. The result shows the formula used, effective temperature, and interpretation.
7. Click Reset to restore default example values.