Kilojoules to Calories converter

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

1 kJ ≈ 239.005736138 cal
1 cal = 0.004184 kJ

Formula: cal ≈ kJ × 239.005736138
kJ = cal × 0.004184

Definitions: 1 kJ = 1000 J; 1 cal = 4.184 J

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.

The calorie (cal) here is the thermochemical calorie, exactly 4.184 joules, roughly the energy needed to raise one gram of water by one degree Celsius. It is used in chemistry and physics and should not be confused with the food Calorie, which is a kilocalorie.

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