◩ CONVERTERS Updated July 25, 2026

Energy Converter

Joules, calories, kWh, BTU and more.

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How it works

Energies convert through the joule. Food calories (kcal) are 1000 small calories, which is the usual source of confusion on nutrition labels.

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Frequently asked questions

Is a food calorie a kilocalorie?

Yes. The 'Calorie' on a nutrition label is 1 kcal, or 4184 joules.

How much is one kWh?

One kilowatt-hour is 3,600,000 joules, the energy used by a 1000 W appliance running for an hour.

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