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Convert joule to kilojoule

Here you can quickly calculate how many kilojoule fit in one joule.
write a number and we convert instantly
swap direction → TWh

- scroll: formula · table · questions -

  • 1 J = 0.001 kJ
  • 1 kJ = 1000 J

Example: joule to kilojoule

  • 1 joule = 0.001 kilojoule

Joule to kilojoule conversion table

joule kilojoule
1 0.001
2 0.002
5 0.005
10 0.01
20 0.02
50 0.05
100 0.1

Joule to kilojoule formula

To convert joule to kilojoule, divide by 1000.

1 J = 0.001 kJ
Example: 1 joule = 0.001 kilojoule

Common energy conversion mistakes

  • The relationship is exact: 1 kWh = 3.6 MJ (3,600 kJ, because an hour has 3,600 seconds). The common slip is dividing when you should multiply: 10 kWh is 36 MJ, not 2.8. Remember the direction: kWh → MJ means times 3.6.

Quick joule and kilojoule conversion quiz

Score: 0

15.3 kilojoule equals 15 300 joule.

Correct answer: 15.3 kilojoule = 15 300 joule.

5.5 kilojoule equals 8 250 joule.

Correct answer: 5.5 kilojoule = 5 500 joule.

24.2 kilojoule equals 24 200 joule.

Correct answer: 24.2 kilojoule = 24 200 joule.

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