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Convert Calorie (th) to Kilojoule

Please provide values below to convert calorie (th) [cal (th)] to kilojoule [kJ], or vice versa.



Definition: A calorie (symbol: cal) is a unit of energy defined as the amount of energy required to increase the temperature of one gram of water by one °C. This is referred to as the small calorie or the gram calorie, and is equal to 4.184 joules, the SI (International System of Units) unit of energy.

A large calorie (symbol: Cal), also known as a kilogram calorie (symbol: Cal), is technically a kilocalorie (symbol: kcal), the equivalent of 1000 small calories, but is also sometimes referred to as simply "Calorie." Large calories are usually used for labeling foods, and as such, is known as the food calorie.

History/origin: The term calorie comes from the Latin word "calor," which means heat. It was first defined as a unit of heat energy in 1824 by Nicolas Clement and appeared in French and English dictionaries between 1841 and 1867. The large calorie was introduced to the American public later, in 1887, by Wilbur Olin Atwater.

Current use: Although the calorie can be used with SI, since the official adoption of SI in 1960, the calorie is considered obsolete. Despite this, the large calorie is still widely used as a unit of food energy, alongside, or in place of the SI unit of food energy, the kilojoule. The use of a capital "C" in Calorie is intended to denote the use of kilocalories rather than calories denoting a single calorie. This is not often understood however, resulting in some confusion when foods are only labeled as Calories rather than kilocalories.

Calories are also used within scientific contexts, such as chemistry. In these contexts, the term being referenced is most often the small calorie, though measurements are often reported in kilocalories.


Definition: The kilojoule is an SI (International System of Units) derived unit of energy that is equal to 1000 joules. The joule is defined as the amount of energy transferred to an object when a one newton force acts on an object in the direction movement through a distance of one meter.

History/origin: The kilojoule, like other SI derived units, uses SI prefixes to denote multiples or submultiples of the given unit. In this case, the prefix "kilo" is used to express a multiple of 1000.

Current use: In countries that have adopted SI, the kilojoule is widely used as a unit of food energy. In some cases, both kilojoules and kilocalories are displayed, though in countries such as the United States, only kilocalories are shown (often referred to as "Calories") on food labels. Aside from this everyday use, kilojoules are used within scientific contexts around the world.

Calorie (th) to Kilojoule Conversion Table

Calorie (th) [cal (th)]Kilojoule [kJ]
0.01 cal (th)4.184E-5 kJ
0.1 cal (th)0.0004184 kJ
1 cal (th)0.004184 kJ
2 cal (th)0.008368 kJ
3 cal (th)0.012552 kJ
5 cal (th)0.02092 kJ
10 cal (th)0.04184 kJ
20 cal (th)0.08368 kJ
50 cal (th)0.2092 kJ
100 cal (th)0.4184 kJ
1000 cal (th)4.184 kJ

How to Convert Calorie (th) to Kilojoule

1 cal (th) = 0.004184 kJ
1 kJ = 239.0057361377 cal (th)

Example: convert 15 cal (th) to kJ:
15 cal (th) = 15 × 0.004184 kJ = 0.06276 kJ

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