Kilocalories to Joules converter

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

1 kcal = 4184 J
1 J ≈ 0.000239005736138 kcal

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

Definitions: 1 kcal = 1000 cal

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 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.

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