Weather calculators

5 calculators

Weather calculators apply meteorological conversions and indices from standard formulas, not live station feeds.

Enter observations yourself. Forecasts, warnings, and local climate data come from weather services, not these pages. Weather indices run in-browser with no login.

Printable Weather formula sheet →

Apparent temperature calculators

Heat index, wind chill, and dew point.

Dew Point Calculator

Dew point from temperature and humidity (Magnus; °C or °F).
Heat Index Calculator

Heat index from air temperature and relative humidity (°C or °F).
Wind Chill Calculator

Wind chill from temperature and wind speed (°C/°F, km/h/mph).

Outdoor planning calculators

Rain conversion and hiking ETA.