Kilocalories to Kilojoules conversion

Kilocalories (kcal) 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 Kilocalories to Kilojoules:

One kilocalorie is equal to 4.184 kilojoules.

1 kcal = 4.184 kJ


Formula:

The energy conversion from kcal to kJ is given by the formula:

The energy in small kilocalories (kcal) is equal to the energy in kilojoules (kJ) divided by 4.184:

E(kcal) = E(J) / 4.184


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