Kilojoule to Joule (kJ to J)
Convert kJ to J — Energy converter
One kilojoule equals 1000 J, so to convert kilojoules to joules you multiply the value by 1000. A kilojoule is larger than a joule — going the other way, 1 J = 0.001 kJ. For example, 10 kJ = 10000 J and 50 kJ = 50000 J.
1000Click to copy
1 kJ = 1000 J
Kilojoule to Joule formula
1 Kilojoule = 1000 J
Worked examples
- 25 kJ = 25000 J
- 100 kJ = 100000 J
Kilojoule to Joule conversion table
| Kilojoule (kJ) | Joule (J) |
|---|---|
| 1 | 1000 |
| 2 | 2000 |
| 3 | 3000 |
| 5 | 5000 |
| 8 | 8000 |
| 10 | 10000 |
| 12 | 12000 |
| 15 | 15000 |
| 20 | 20000 |
| 25 | 25000 |
| 50 | 50000 |
| 100 | 100000 |
| 250 | 250000 |
| 500 | 500000 |
| 1000 | 1000000 |
Frequently asked questions
How many joules are in one kilojoule?
One kilojoule equals 1000 joules (J).
How many kilojoules are in one joule?
One joule equals 0.001 kilojoules (kJ).
How do you convert kilojoules to joules?
1 Kilojoule = 1000 J. Use the calculator above for any value.
What is 5 kJ in J?
5 kJ = 5000 J.
What is 100 kJ in J?
100 kJ = 100000 J.
What is 10 kJ in J?
10 kJ = 10000 J.
What is 20 kJ in J?
20 kJ = 20000 J.
Is a kilojoule bigger than a joule?
Yes. A kilojoule is larger — one kilojoule equals 1000 joules (J).