Joules to Kilocalories converter

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

1 J ≈ 0.000239005736138 kcal
1 kcal = 4184 J

Formula: kcal ≈ J × 0.000239005736138
J = kcal × 4184

Definitions: 1 kcal = 1000 cal

The joule (J) is the SI unit of energy and work: the energy of one newton acting over one meter, or of one watt working for one second. It is a small unit, roughly the energy needed to lift a small apple by one meter.

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.

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