Kilojoules to Joules Converter

Kilojoules to Joules Converter

Joules
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Calories (kcal)
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1 kJ = 1000 J · 1 kJ = 0.239006 kcal

How to convert kilojoules to joules

To convert kilojoules to joules, multiply by 1000. There are exactly 1000 joules in every kilojoule. For example, 5 kJ × 1000 = 5000 joules. Going the other way, divide joules by 1000 to get kilojoules.

To convert kilojoules to kilocalories (food Calories), divide by 4.184. So 100 kJ ÷ 4.184 = 23.901 kcal.

1 kJ = 1000 J = 0.239006 kcal. Kilojoules are used in food labeling in Australia and Europe. 1 food Calorie = 1 kcal = 4.184 kJ = 4184 J.

Kilojoules to joules conversion table

Kilojoules (kJ) Joules (J) Kilocalories (kcal)
0.1 kJ100 J0.0239 kcal
0.5 kJ500 J0.1195 kcal
1 kJ1000 J0.239 kcal
4.184 kJ4184 J1 kcal
10 kJ10,000 J2.390 kcal
100 kJ100,000 J23.901 kcal
8368 kJ8,368,000 J2000 kcal

Frequently asked questions

How many joules are in a kilojoule?
There are exactly 1000 joules in 1 kilojoule. The prefix “kilo” always means one thousand.
How many joules is 5 kJ?
5 kJ = 5000 joules. Calculation: 5 × 1000 = 5000 J.
How many kcal is 100 kJ?
100 kJ = 23.901 kcal. Calculation: 100 ÷ 4.184 = 23.901 kcal.
How many kJ is 2000 Calories?
2000 kcal = 8368 kJ = 8,368,000 J. This is the average daily calorie intake for an adult.
What is a kilojoule used for?
Kilojoules are used in food labeling in Australia and Europe as an alternative to Calories. They are also used in chemistry, physics, and engineering to measure energy.