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Calories to Joules conversion

Select calorie unit type:
  
Energy result in joules:J

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 calories to joules

Thermochemical calories to joules

1 calth = 4.184 J

The energy in joules E(J) is equal to 4.184 times the energy in thermochemical calories E(calth):

E(J) = 4.184 × E(calth)

Joules to calories conversion