Convert kilojoules to joules
1 kJ = 1,000 J. Change the amount below, or read the formula and the reference table further down.
1 kilojoule equals
joules
1 kJ = 1,000 J
The formula
Kilojoules and joules both measure energy from the same zero, so a single multiplier does the job.
J = kJ × 1,000
Going the other way? Convert joules to kilojoules.
Kilojoules to joules table
Common values, rounded for reading.
| Kilojoules (kJ) | Joules (J) |
|---|---|
| 1 | 1,000 |
| 2 | 2,000 |
| 3 | 3,000 |
| 4 | 4,000 |
| 5 | 5,000 |
| 6 | 6,000 |
| 7 | 7,000 |
| 8 | 8,000 |
| 9 | 9,000 |
| 10 | 10,000 |
| 15 | 15,000 |
| 20 | 20,000 |
| 25 | 25,000 |
| 30 | 30,000 |
| 40 | 40,000 |
| 50 | 50,000 |
| 75 | 75,000 |
| 100 | 100,000 |
| 250 | 250,000 |
| 500 | 500,000 |
| 1,000 | 1,000,000 |
Questions people ask
- How many joules are in a kilojoule?
- One kilojoule equals 1,000 joules.
- How do I convert kilojoules to joules by hand?
- Multiply the number of kilojoules by 1,000. For a rough check, 1,000 is close enough for most everyday use.
- What is 1 kilojoule in joules?
- 1 kilojoule is 1,000 joules.
Calcuit generates this page from a unit table, so the factors here match every other page on the site.