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Joules to Kilojoules

One joule is 0.001 kilojoules. Energy units for food, electricity and physics. The "calorie" on a nutrition label is a kilocalorie — 1,000 of the calories used in physics.

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0.001

1 joule = 0.001 kilojoules · open this conversion

Formula

kilojoules = joules × 0.001

A food Calorie (capital C) is a kilocalorie. The thermochemical calorie of 4.184 J is used here.

Joules to Kilojoules table

JoulesKilojoules
1 J0.001 kJ
2 J0.002 kJ
5 J0.005 kJ
10 J0.01 kJ
20 J0.02 kJ
25 J0.025 kJ
50 J0.05 kJ
100 J0.1 kJ
150 J0.15 kJ
200 J0.2 kJ
250 J0.25 kJ
300 J0.3 kJ
400 J0.4 kJ
500 J0.5 kJ
600 J0.6 kJ
800 J0.8 kJ
1,000 J1 kJ
1,500 J1.5 kJ
2,000 J2 kJ
2,500 J2.5 kJ
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Other energy conversions

Frequently asked questions

How many kilojoules are in a joule?
One joule is 0.001 kilojoules. kilojoules = joules × 0.001.
How do I convert joules to kilojoules?
Multiply the number of joules by 0.001. For example, 10 J × 0.001 = 0.01 kJ.
What is the difference between joules and kilojoules?
Joule (J) and Kilojoule (kJ) both measure energy. Energy units for food, electricity and physics. The "calorie" on a nutrition label is a kilocalorie — 1,000 of the calories used in physics.
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