⛅ Weather Calculators

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.

Calculate the heat index or feels-like temperature from air temperature and relative humidity using the National Weather Service methodology.

Calculate dew point temperature from air temperature and relative humidity using a standard Magnus-type meteorological equation.

Estimate cloud base height above ground from surface temperature and dew point using the standard aviation temperature-dew-point spread method.

Calculate U.S. EPA PM2.5 AQI and estimate cumulative AQI-hours for a planned outdoor exposure period. The AQI-hours value is a planning metric, not a medical dose measurement.

Calculate the Moon age, phase position, approximate illumination and eight-phase lunar phase code for any date.

Convert wind speed between kilometers per hour, miles per hour, meters per second, knots, feet per second and other common wind-speed units.

Convert temperature between Celsius, Fahrenheit, Kelvin, Rankine and other common temperature scales.