Kilojoules to Calories conversion

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 from kilojoules to calories

Kilojoules to thermochemical calories

1 cal_th = 0.004184 kJ

1 kJ = 239.0057 cal_th

The energy in thermochemical calories E_(calth) is equal to the energy in kilojoulesE_(kJ) times 239.0057:

E_(cal) = E_(kJ) × 239.0057

Calories to kJ conversion