# 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 Convert button:

 Select calorie unit type: Small thermochemical calories Small 15ºC calories Large/food calories Enter energy in calories: Energy result in kilojoules: kJ

kJ to calories conversion

### 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 calorie is also called food calorie and is used as a unit of food energy.

### Thermochemical calories to kJ

1 calth = 0.004184 kJ

1 kJ = 239.005736 calth

The energy in kilojoules E(kJ) is equal to the energy in thermochemical calories E(calth) divided by 239.005736:

E(kJ) = E(calth) / 239.005736

#### Example

Convert 300 calth to kilojoules.

E(kJ) = 300calth / 239.005736 = 1.2552 kJ

### 15ºC calories to kJ

1 cal15 = 0.0041855 kJ

1 kJ = 238.9201 cal15

The energy in kilojoules E(kJ) is equal to the energy in 15ºC calories E(cal15) divided by 238.9201:

E(kJ) = E(cal15) / 238.9201

#### Example

Convert 300 cal15 to kilojoules.

E(kJ) = 300cal15 / 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 calories E(Cal):

E(kJ) = 4.184 × E(calth)

#### Example

Convert 0.3 Cal to kilojoules.

E(kJ) = 4.184 × 0.3 Cal = 1.2552 kJ

kJ to calories conversion