# Calories to Kilojoules (kJ) conversion Calories to kilojoules (kJ) conversion is the process of converting energy values from calories (cal) to kilojoules. To convert calories to kilojoules, you need to divide the value in calories by 4.184.

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

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## What is Calories to Kilojoules (kJ) conversion

To convert calories (cal) to kilojoules (kJ), you can use the conversion factor 0.004184.

Kilojoules = Calories * 0.004184

For example, let's convert 100 calories to kilojoules:

Kilojoules = 100 cal * 0.004184 Kilojoules = 0.4184 kJ

Therefore, 100 calories is equal to 0.4184 kilojoules.

## 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 kilojoules

### 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

### 15°C 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 15°C 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