Kilojoules (kJ) to calories (cal), energy conversion calculator and how to convert.
Kilojoules to calories conversion calculator
Enter the energy in kilojoules, select calorie unit type and press the Convert button:
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 calth = 0.004184 kJ
1 kJ = 239.0057 calth
The energy in thermochemical calories E(calth) is equal to the energy in kilojoules E(kJ) times 239.0057:
E(cal) = E(kJ) × 239.0057
Example
Convert 0.6 kilojoules to thermochemical calories.
E(cal) = 0.6kJ × 239.0057 = 143.4 calth
Kilojoules to 15°C calories
1 cal15 = 0.0041855 kJ
1 kJ = 238.9201 cal15
The energy in 15°C calories E(cal15) is equal to the energy in kilojoules E(kJ) times 238.9201:
E(cal15) = E(kJ) × 238.9201
Example
Convert 0.6 kilojoules to 15°C calories.
E(cal15) = 0.6kJ × 238.9201 = 143.352 cal15
Kilojoules to large/food calories
1 Cal = 4.184 kJ
1 kJ = 0.239 Cal
The energy in large/food calories E(Cal) is equal to the energy in kilojoules E(kJ) times 0.239:
E(Cal) = E(kJ) × 0.239
Example
Convert 0.6 kilojoules to food calories.
E(Cal) = 0.6kJ × 0.239 = 0.1434 Cal