Weather 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

Dew Point Calculator

Dew point from temperature and humidity (Magnus; °C or °F).
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Weather

Heat Index Calculator

Heat index from air temperature and relative humidity (°C or °F).
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Weather

Hiking ETA Calculator

Rough hike time from distance, pace, and elevation gain.
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Weather

Rain Convert Calculator

Rainfall mm ↔ inches (mode 0=mm→in, 1=in→mm).
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Weather

Wind Chill Calculator

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