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Calories to Kilojoules conversion

Calories (cal) to Kilojoules (kJ) energy conversion calculator and how to convert.

Small & large calories

Small calorie (cal) is the energy needed to increase 1 gram of water by 1°C at a pressure of 1 atmosphere.

Large calorie (Cal) is the energy needed to increase 1 kg of water by 1°C at a pressure of 1 atmosphere.

Large calorie is also called food calorie and is used as a unit of food energy.

How to convert Calories to Kilojoules:

1 gram calorie is equal to 0.004184 kilojoules.

1 cal = 0.004184 kcal

Formula:

The energy in small calories (cal) to kilojoules (kJ) is given by the formula:

E(kJ) = E(cal) / 239.006
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