## Calories to kilojoules conversion

Calories (cal) to kilojoules (kJ), energy conversion calculator and how to convert.

## Calories to kilojoules conversion calculator

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

Convertbutton:## Small & large calories

Small calorie(cal) is the energy needed to increase 1 gram of water by 1ºC at a pressure of 1 atmosphere.

Large calorie(Cal) is the energy needed to increase 1 kg of water by 1ºC at a pressure of 1 atmosphere.

Large calorieis also calledfood calorieand is used as a unit of food energy.## How to convert from calories to kilojoules

## Thermochemical calories to kJ

1 cal

_{th}= 0.004184 kJ1 kJ = 239.005736 cal

_{th}The energy in kilojoules

E_{(kJ)}is equal to the energy in thermochemical caloriesE_{(calth}) divided by 239.005736:

E_{(kJ)}=E_{(calth)}/ 239.005736## Example

Convert 300 cal

_{th}to kilojoules.

E_{(kJ)}= 300cal_{th}/ 239.005736 = 1.2552 kJ## 15ºC calories to kJ

1 cal

_{15}= 0.0041855 kJ1 kJ = 238.9201 cal

_{15}The energy in kilojoules

E_{(kJ)}is equal to the energy in 15ºC caloriesE_{(cal15)}divided by 238.9201:

E_{(kJ)}=E_{(cal15)}/ 238.9201## Example

Convert 300 cal

_{15}to kilojoules.

E_{(kJ)}= 300cal_{15}/ 238.9201 = 1.25565 kJ## Large/food calories to kJ

1 Cal = 4.184 kJ

1 kJ = 0.239 Cal

The energy in kilojoules

E_{(kJ)}is equal to 4184 times the energy in large/food caloriesE_{(Cal)}:

E_{(kJ)}= 4.184× E_{(calth)}## Example

Convert 0.3 Cal to kilojoules.

E_{(kJ)}= 4.184×0.3 Cal = 1.2552 kJ

## See also