Joules to Kilojoules Converter
How to convert joules to kilojoules
kilojoules = joules ÷ 1,000
To convert joules to kilojoules, divide the number of joules by 1,000.
1 J = 0.001 kJ
Examples
- 1,000 J ÷ 1,000 = 1 kJ
- One kilocalorie: 4,184 J ÷ 1,000 = 4.184 kJ
Good to know
One kilojoule is exactly 1000 joules.
Joules to kilojoules conversion table
| Joules (J) | Kilojoules (kJ) |
|---|---|
| 1 J | 0.001 kJ |
| 2 J | 0.002 kJ |
| 5 J | 0.005 kJ |
| 10 J | 0.01 kJ |
| 20 J | 0.02 kJ |
| 50 J | 0.05 kJ |
| 100 J | 0.1 kJ |
| 200 J | 0.2 kJ |
| 250 J | 0.25 kJ |
| 500 J | 0.5 kJ |
| 1,000 J | 1 kJ |
| 2,000 J | 2 kJ |
| 2,500 J | 2.5 kJ |
| 5,000 J | 5 kJ |
| 10,000 J | 10 kJ |
Unit definitions
- Joule (J)
- The joule is the SI unit of energy, equal to the work done by a force of one newton over one meter, or one watt for one second.
- Kilojoule (kJ)
- A kilojoule is 1000 joules. It is the unit for food energy on nutrition labels in Australia, New Zealand and, alongside kilocalories, the European Union.