Joule to Kilojoule (J to kJ)
Convert J to kJ — Energy converter
One joule equals 0.001 kJ, so to convert joules to kilojoules you multiply the value by 0.001. A joule is smaller than a kilojoule — going the other way, 1 kJ = 1000 J. For example, 10 J = 0.01 kJ and 50 J = 0.05 kJ.
0.001Click to copy
1 J = 0.001 kJ
Joule to Kilojoule formula
1 Joule = 0.001 kJ
Worked examples
- 25 J = 0.025 kJ
- 100 J = 0.1 kJ
Joule to Kilojoule conversion table
| Joule (J) | Kilojoule (kJ) |
|---|---|
| 1 | 0.001 |
| 2 | 0.002 |
| 3 | 0.003 |
| 5 | 0.005 |
| 8 | 0.008 |
| 10 | 0.01 |
| 12 | 0.012 |
| 15 | 0.015 |
| 20 | 0.02 |
| 25 | 0.025 |
| 50 | 0.05 |
| 100 | 0.1 |
| 250 | 0.25 |
| 500 | 0.5 |
| 1000 | 1 |
Frequently asked questions
How many kilojoules are in one joule?
One joule equals 0.001 kilojoules (kJ).
How many joules are in one kilojoule?
One kilojoule equals 1000 joules (J).
How do you convert joules to kilojoules?
1 Joule = 0.001 kJ. Use the calculator above for any value.
What is 5 J in kJ?
5 J = 0.005 kJ.
What is 100 J in kJ?
100 J = 0.1 kJ.
What is 10 J in kJ?
10 J = 0.01 kJ.
What is 20 J in kJ?
20 J = 0.02 kJ.
Is a joule bigger than a kilojoule?
No. A joule is smaller — one joule equals 0.001 kilojoules, while one kilojoule equals 1000 joules.