# What is kcal?

What is a kcal unit?

## kcal definition

kcal is the symbol of kilocalorie.

One kilocalorie is equal to 1000 calories.

### 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.

There are several definitions of calorie according to temperature.

## kcal conversions

### kcal to cal conversion

One kilocalorie is equal to 1000 small calories:

1 kcal = 1000 cal

One kilocalorie is equal to 1 large/food calorie:

1 kcal = 1 Cal

### kcal to kilojoules conversion

There are several definitions of calorie:

#### Thermochemical / food kilocalories to kilojoules

1 kcal_{th} = 4.184 kJ

The energy in kilojoules *E*_{(kJ)} is equal to 4.184 times the energy in thermochecmical / food kilocalories *E*_{(kcal)}:

*E*_{(kJ)} = 4.184* × E*_{(kcal-th)}

#### International kilocalories to kilojoules

1 kcal_{IT} = 4.1868 kJ

The energy in kilojoules *E*_{(kJ)} is equal to 4.1868
times the energy in international kilocalories *E*_{(kcal-IT)}:

*E*_{(kJ)} = 4.1868* × E*_{(kcal-IT)}

#### 15°C kilocalories to kilojoules

1 kcal_{15} = 4.1855 kJ

The energy in kilojoules *E*_{(kJ)} is equal to 4.1855 times the energy in 15°C kilocalories *E*_{(kcal15)}:

*E*_{(kJ)} = 4.1855* × E*_{(kcal15)}

#### 20°C kilocalories to joules

1 cal_{20} = 4.182 kJ

The energy in kilojoules *E*_{(kJ)} is equal to 4.182 times the energy in 20°C kilocalories *E*_{(kcal20)}:

*E*_{(kJ)} = 4.182* × E*_{(kcal20)}

kcal to kJ conversion calculator ►