Convert Kilojoules to Joules
kJ to J · energy conversion
What are kilojoules and joules?
A kilojoule is 1,000 joules, used for food energy outside the US. The joule is the SI unit of energy, the work done by one newton acting over one meter. For reference: a food Calorie is one kilocalorie (4,184 J), and home electricity is billed in kilowatt-hours.
How to convert kilojoules to joules
1 kJ = 1,000 J. To convert, multiply the number of kilojoules by 1,000. For example, 5 kJ = 5,000 J, and 20 kJ = 20,000 J. To go the other way, multiply joules by 0.001 (since 1 J = 0.001 kJ).
Kilojoules to Joules conversion table
| Kilojoules (kJ) | Joules (J) |
|---|---|
| 1 | 1,000 |
| 10 | 10,000 |
| 100 | 100,000 |
| 500 | 500,000 |
| 1,000 | 1,000,000 |
| 2,000 | 2,000,000 |
| 5,000 | 5,000,000 |
FAQ
What is 1 kJ in J?
1 kJ = 1,000 J. To convert any amount, multiply the number of kilojoules by 1,000.
How do I convert joules back to kilojoules?
Go the other way: 1 J = 0.001 kJ, so multiply joules by 0.001 to get kilojoules.
Is a kilojoule bigger than a joule?
Yes — 1 kJ is the larger unit, equal to 1,000 J.
Are these energy conversions exact?
They use the standard internationally-defined conversion factors. Results are rounded to six significant figures for readability, which is accurate enough for everyday and most technical use.