# Calories to joules free online 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:

Cal
J

Joules to calories conversion »

## 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 calth = 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 calth to joules.

E(J) = 4.184 × 300calth = 1255.2 J

### 15°C calories to joules

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)

#### Example

Convert 300 cal15 to joules.

E(J) = 4.1855 × 300cal15 = 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

Joules to calories conversion »

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