1 joule to kilojoules
1 J = 0.001 kJ. Change the amount below, or read the formula and the reference table further down.
1 joule equals
kilojoules
1 J = 0.001 kJ
The formula
Joules and kilojoules both measure energy from the same zero, so a single multiplier does the job.
kJ = J × 0.001
Going the other way? Convert kilojoules to joules.
Joules to kilojoules table
Values either side of 1 J.
| Joules (J) | Kilojoules (kJ) |
|---|---|
| -4 | -0.004 |
| -3.5 | -0.0035 |
| -3 | -0.003 |
| -2.5 | -0.0025 |
| -2 | -0.002 |
| -1.5 | -0.0015 |
| -1 | -0.001 |
| -0.5 | -0.0005 |
| 0 | 0 |
| 0.5 | 0.0005 |
| 1 | 0.001 |
| 1.5 | 0.0015 |
| 2 | 0.002 |
| 2.5 | 0.0025 |
| 3 | 0.003 |
| 3.5 | 0.0035 |
| 4 | 0.004 |
| 4.5 | 0.0045 |
| 5 | 0.005 |
| 5.5 | 0.0055 |
| 6 | 0.006 |
Questions people ask
- How many kilojoules are in a joule?
- One joule equals 0.001 kilojoules.
- How do I convert joules to kilojoules by hand?
- Multiply the number of joules by 0.001. For a rough check, 0.001 is close enough for most everyday use.
- What is 1 joule in kilojoules?
- 1 joule is 0.001 kilojoules.
Calcuit generates this page from a unit table, so the factors here match every other page on the site.