Science & Weather Calculators

Physics, chemistry, and weather in one place. Calculate wind chill, heat index, and dew point with official formulas, work out half-life and Ohm’s law, and check the moon phase and sunrise or sunset.

7 free calculators · no sign-up · instant results

Weather

Wind Chill Calculator

How cold it really feels, via the official NWS formula

Heat Index Calculator

How hot it really feels, from temperature and humidity

Dew Point Calculator

Dew point and comfort level from temp and humidity

Physics & Space

Sunrise & Sunset Calculator

Sunrise, sunset, and day length for any location

Moon Phase Calculator

Moon phase, illumination, and next full moon

Half-Life Calculator

Remaining amount, decay constant & mean lifetime

Ohm’s Law Calculator

Solve volts, amps, ohms & watts from any two

Frequently asked questions

Which formulas do the weather calculators use?

The Wind Chill and Heat Index calculators use the official U.S. National Weather Service formulas, so results match what forecasters report.

What can I use Ohm’s law calculator for?

It solves for voltage, current, resistance, or power when you know any two — handy for electronics, wiring, and physics homework.

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