Joules to Kilojoules
Convert J to kJ. 1 joule = 0.001 kJ, and 1 kilojoule = 1,000 J.
Formula Divide the value in joules by 1,000. Joules to Kilojoules table
1 joule in every unit
| Kilojoules | 0.001 | kJ |
|---|---|---|
| Megajoules | 0.000001 | MJ |
| Calories | 0.239005736138 | cal |
| Kilocalories | 0.000239005736 | kcal |
| Watt-hours | 0.000277777778 | Wh |
| Kilowatt-hours | 0.000000277778 | kWh |
| British thermal units | 0.00094781712 | BTU |
| Foot-pounds | 0.737562149277 | ft·lbf |
| Electronvolts | 6.241509e+18 | eV |
Food labels write kilocalories (kcal) as "Calories". Calories here are thermochemical: 1 cal = 4.184 J.
How to convert joules to kilojoules
Divide the value in joules by 1,000.
For example, 10 J = 0.01 kJ, and 10 kJ = 10,000 J.
Frequently asked questions
How many kilojoules are in one joule?
1 joule = 0.001 kJ.
What is 10 J in kJ?
10 J = 0.01 kJ.
How do I convert kJ back to J?
Multiply the value in kilojoules by 1,000. 1 kilojoule = 1,000 J.
Joules to Kilojoules table
| Joules (J) | Kilojoules (kJ) |
|---|---|
| 0.1 | 0.0001 |
| 0.5 | 0.0005 |
| 1 | 0.001 |
| 2 | 0.002 |
| 3 | 0.003 |
| 4 | 0.004 |
| 5 | 0.005 |
| 6 | 0.006 |
| 7 | 0.007 |
| 8 | 0.008 |
| 9 | 0.009 |
| 10 | 0.01 |
| 15 | 0.015 |
| 20 | 0.02 |
| 25 | 0.025 |
| 30 | 0.03 |
| 50 | 0.05 |
| 75 | 0.075 |
| 100 | 0.1 |
| 250 | 0.25 |
| 500 | 0.5 |
| 1,000 | 1 |
Related conversions
Every tool runs in your browser. Nothing you type or upload is sent to a server.