Calories to Joules conversion

Calories (cal) to joules (J), energy conversion calculator and how to convert.

Calories to joules conversion calculator

Select calorie unit type, enter the energy in calories and press the Convert button:

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.

1 cal_th = 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)

Convert 300 cal_th to joules.

E_(J) = 4.184 × 300cal_th = 1255.2 J

1 cal₁₅ = 4.1855 J

The energy in joules E_(J) is equal to 4.1855 times the energy in 15°C calories E_(cal15):

E_(J) = 4.1855 × E_(cal15)

Convert 300 cal₁₅ to joules.

E_(J) = 4.1855 × 300cal₁₅ = 1255.65 J

1 Cal = 4.184 kJ = 4184 J

The energy in joules E_(J) is equal to 4184 times the energy in large/food calories E_(Cal):

E_(J) = 4184 × E_(Cal)

Convert 0.3 Cal to joules.

E_(J) = 4184 × 0.3 Cal = 1255.2 J