Science calculators.

Atmospheric science, weather and physics calculators with real-time, shareable results.

Dew Point Calculator

Calculate dew point, absolute humidity, wet-bulb temperature and vapor pressure from air temperature and relative humidity.

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Heat Index Calculator

Calculate the apparent "feels-like" temperature in heat using the NWS Heat Index equation with danger level indicator.

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Wind Chill Calculator

Calculate the perceived temperature in cold and windy conditions using the NWS 2001 Wind Chill formula.

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Humidity Calculator

Convert between relative humidity, absolute humidity, specific humidity and dew point temperature.

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Altitude & Pressure

Convert between altitude and atmospheric pressure using the International Standard Atmosphere model.

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IC Engine Simulator

Interactive 3D four-stroke internal-combustion engine — watch intake, compression, power and exhaust with live pistons, crankshaft and valves, rendered with WebGPU.