# Calories to Joules conversion

Calories to joules conversion is the process of converting energy values from calories (cal) to joules (J). To convert calories to joules, you need to multiply the value in calories by the conversion factor 4.184.

## What is Calories to Joules conversion

To convert calories (cal) to joules (J), you can use the conversion factor 4.184.

Joules = Calories * 4.184

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

Joules = 100 cal * 4.184 Joules = 418.4 J

Therefore, 100 calories is equal to 418.4 joules.

## 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 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)}

### Example

Convert 300 cal_{th} to joules.

*E*_{(J)} = 4.184 *× *300cal_{th} = 1255.2 J

### 15°C calories to joules

1 cal_{15} = 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)}

### Example

Convert 300 cal_{15} to joules.

*E*_{(J)} = 4.1855 *× *300cal_{15} = 1255.65 J

### Large/food calories to joules

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)}

### Example

Convert 0.3 Cal to joules.

*E*_{(J)} = 4184 *× *0.3 Cal = 1255.2 J