Kilocalories to Kilojoules converter

To convert kilocalories to kilojoules, enter the value in the first field. The result in kilojoules is calculated automatically using the exact conversion factor.

1 kcal = 4.184 kJ
1 kJ ≈ 0.239005736138 kcal

Formula: kJ = kcal × 4.184
kcal ≈ kJ × 0.239005736138

Definitions: 1 kcal = 1000 cal; 1 kJ = 1000 J

The kilocalorie (kcal) is 1,000 calories, exactly 4,184 joules. It is the unit behind the Calories on food labels and is used for diet and exercise energy, especially in the United States and, next to kilojoules, in many other countries.

The kilojoule (kJ) is 1,000 joules. It is used for food energy on nutrition labels in Australia, New Zealand and Europe, often next to kcal, and for reaction energies in chemistry.

See the conversion table with commonly used values, handy for quick reference or study.