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Energy Converter

Convert kcal to kJ, kWh, joules, BTU, calories and electronvolts.

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How to use the Energy Converter

  1. 1

    Enter an amount of energy.

  2. 2

    Choose the units to convert between.

  3. 3

    Read the result or compare all units.

Frequently asked questions

How many kilojoules are in a calorie?

One food calorie (kcal) is 4.184 kJ.

How precise is it?

Conversions use exact, internationally defined factors and show up to 10 significant digits.