Joules to Kilojoules Converter
Convert joules (watt-seconds) (J) to kilojoules (kJ), with the formula, a conversion table and exact factors.
Change the values and press Calculate to work out your own figures.
Enter an amount of energy, choose its unit and the unit you want. The answer is exact until it is shown, and the same value appears in every other unit.
Show the working
- 1 J = 0.001 kJ
- 1 × 0.001 = 0.001 kJ
How to convert joules to kilojoules
1 J = 0.001 kJ, so multiply by 0.001 to go from joules (watt-seconds) to kilojoules. Going the other way, 1 kJ = 1,000 J.
kJ = J × 0.001 J = kJ × 1,000
Worked example:
1 J = 0.001 kJ 5 × 0.001 = 0.005 kJ
Joules to kilojoules table
| Joules | Kilojoules |
|---|---|
| 1 J | 0.001 kJ |
| 2 J | 0.002 kJ |
| 3 J | 0.003 kJ |
| 4 J | 0.004 kJ |
| 5 J | 0.005 kJ |
| 6 J | 0.006 kJ |
| 7 J | 0.007 kJ |
| 8 J | 0.008 kJ |
| 9 J | 0.009 kJ |
| 10 J | 0.01 kJ |
| 15 J | 0.015 kJ |
| 20 J | 0.02 kJ |
| 25 J | 0.025 kJ |
| 30 J | 0.03 kJ |
| 40 J | 0.04 kJ |
| 50 J | 0.05 kJ |
| 75 J | 0.075 kJ |
| 100 J | 0.1 kJ |
| 250 J | 0.25 kJ |
| 500 J | 0.5 kJ |
| 1000 J | 1 kJ |
About the units
- Joules (J)
- Joules (watt-seconds), a metric unit. Definition: BIPM SI Brochure, 9th edition (SI units, prefixes and units accepted for use with the SI).
- Kilojoules (kJ)
- Kilojoules, a metric unit. Definition: BIPM SI Brochure, 9th edition (SI units, prefixes and units accepted for use with the SI).
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