Convert kilojoules to joules
1 kJ = 1000 J — exactly. Both units are defined against the SI, so this factor is a fraction, not an approximation.
1000J
1 kJ = 1000 J
How to convert kilojoules to joules
Multiply the number of kilojoules by 1000 to get joules.
The exact factor is 1000 .
Kilojoule to Joule conversion table
| Kilojoules (kJ) | Joules (J) |
|---|---|
| 1 kJ | 1000 |
| 2 kJ | 2000 |
| 3 kJ | 3000 |
| 5 kJ | 5000 |
| 10 kJ | 10 000 |
| 20 kJ | 20 000 |
| 25 kJ | 25 000 |
| 50 kJ | 50 000 |
| 100 kJ | 100 000 |
| 250 kJ | 250 000 |
| 500 kJ | 500 000 |
| 1000 kJ | 1 000 000 |
Joule to Kilojoule conversion table
| Joules (J) | Kilojoules (kJ) |
|---|---|
| 1 J | 0.001 |
| 2 J | 0.002 |
| 3 J | 0.003 |
| 5 J | 0.005 |
| 10 J | 0.01 |
| 20 J | 0.02 |
| 25 J | 0.025 |
| 50 J | 0.05 |
| 100 J | 0.1 |
| 250 J | 0.25 |
| 500 J | 0.5 |
| 1000 J | 1 |
Frequently asked
How many joules are in a kilojoule?
One kilojoule equals 1000 joules (kJ → J). That figure is exact, not rounded.
How do you convert kilojoules to joules?
Multiply the number of kilojoules by 1000 to get joules.
What is 1 J in kilojoules?
One joule is 0.001 kilojoules.
What is 10 kJ in J?
10 kJ = 10 000 J.