Convert kilojoules to joules
Kilojoule (kJ) to joule (J). One kilojoule equals 1000 joules.
Formula
Kilojoule to joule conversion table
| Kilojoules | Joules | Joules | Kilojoules |
|---|---|---|---|
| 1 kJ | 1000 J | 1 J | 0.001 kJ |
| 2 kJ | 2000 J | 2 J | 0.002 kJ |
| 3 kJ | 3000 J | 3 J | 0.003 kJ |
| 5 kJ | 5000 J | 5 J | 0.005 kJ |
| 10 kJ | 10000 J | 10 J | 0.01 kJ |
| 20 kJ | 20000 J | 20 J | 0.02 kJ |
| 50 kJ | 50000 J | 50 J | 0.05 kJ |
| 100 kJ | 100000 J | 100 J | 0.1 kJ |
| 500 kJ | 500000 J | 500 J | 0.5 kJ |
| 1000 kJ | 1000000 J | 1000 J | 1 kJ |
To convert kilojoules to joules, multiply the number of kilojoules by 1000. One kilojoule equals 1000 joules, and one joule equals 0.001 kilojoules, so the relationship is fixed and exact. As a worked example, 10 kJ comes to 10000 J. Enter your own figure in the converter above to get an instant answer, or use the swap button to flip the direction. This is a energy conversion, and like every tool on UnitGlide it runs locally in your browser with no account or upload required. The table further down shows a range of common kilojoule values already worked out in joules, plus the reverse joule to kilojoule direction, which is handy for quick reference or double-checking a result by hand.
Frequently asked questions
How many joules are in a kilojoule?
One kilojoule equals 1000 joules. The ratio is constant, so you can multiply any number of kilojoules by 1000 to get joules.
What is the formula to convert kilojoules to joules?
Use joules = kilojoules × 1000. UnitGlide applies this exact formula for every value, so results stay accurate across the whole range.
How do I convert joules back to kilojoules?
Go the other way by using one joule equals 0.001 kilojoules. You can also press the swap button in the converter above to flip the direction in one click.
Is this kilojoule to joule converter accurate?
Yes. It uses internationally defined SI conversion factors, as maintained by the BIPM, and all math runs in your browser so nothing is rounded away on a server. For everyday use the displayed precision is more than enough.