Kilocalories (kcal) to kilojoules (kJ) energy conversion calculator and how to convert.
kcal to kJ conversion calculator
Select calorie unit type, enter the energy in kilocalories and press the Convert button:
How to convert from kcal to kilojoules
Thermochemical / food kilocalories to kilojoules
1 kcalth = 4.184 kJ
The energy in kilojoules E(kJ) is equal to 4.184 times the energy in thermochecmical / food kilocalories E(kcal):
E(kJ) = 4.184 × E(kcal-th)
Example
Convert 0.3 kcalth to kilojoules.
E(kJ) = 4.184 × 0.3 kcalth = 1.2552 kJ
International kilocalories to kilojoules
1 kcalIT = 4.1868 kJ
The energy in kilojoules E(kJ) is equal to 4.1868 times the energy in international kilocalories E(kcal-IT):
E(kJ) = 4.1868 × E(kcal-IT)
Example
Convert 0.3 kcalIT to kilojoules.
E(kJ) = 4.1868 × 0.3kcalIT = 1.25604 kJ
15°C kilocalories to kilojoules
1 kcal15 = 4.1855 kJ
The energy in kilojoules E(kJ) is equal to 4.1855 times the energy in 15°C kilocalories E(kcal15):
E(kJ) = 4.1855 × E(kcal15)
Example
Convert 0.3 kcal15 to kilojoules.
E(kJ) = 4.1855 × 0.3kcal15 = 1.25565 kJ
20°C kilocalories to kilojoules
1 cal20 = 4.182 kJ
The energy in kilojoules E(kJ) is equal to 4.182 times the energy in 20°C kilocalories E(kcal20):
E(kJ) = 4.182 × E(kcal20)
Example
Convert 0.3 kcal20 to kilojoules.
E(kJ) = 4.182 × 0.3kcal20 = 1.2546 kJ