Kilojoules to joules converter
Joules (J)
1 kilojoule = 1,000 joules
How to convert kilojoules to joules
J = kJ × 1000
Multiply the number of kilojoules by 1000 to get joules. Going the other way, divide by 1000 (or multiply by 0.001).
One kilojoule is exactly defined as 1000 joules (to 12 significant figures), and one joule is 0.001 kilojoules.
Worked examples
- Convert 5 kilojoules: 5 × 1000 = 5,000 5,000 joules.
- Convert 12.5 kilojoules: 12.5 × 1000 = 12,500 12,500 joules.
- Convert 250 kilojoules: 250 × 1000 = 250,000 250,000 joules.
Quick-reference table
| kJ | J |
|---|---|
| 1 | 1,000 |
| 2 | 2,000 |
| 3 | 3,000 |
| 5 | 5,000 |
| 10 | 10,000 |
| 15 | 15,000 |
| 20 | 20,000 |
| 25 | 25,000 |
| 50 | 50,000 |
| 75 | 75,000 |
| 100 | 100,000 |
| 1,000 | 1,000,000 |
| J | kJ |
|---|---|
| 1 | 0.001 |
| 2 | 0.002 |
| 3 | 0.003 |
| 5 | 0.005 |
| 10 | 0.01 |
| 15 | 0.015 |
| 20 | 0.02 |
| 25 | 0.025 |
| 50 | 0.05 |
| 75 | 0.075 |
| 100 | 0.1 |
| 1,000 | 1 |
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Frequently asked questions
How many joules are in 1 kilojoule?
1 kilojoule equals 1,000 joules.
What is the formula to convert kilojoules to joules?
Use J = kJ × 1000. Multiply the number of kilojoules by 1000 to get joules. Going the other way, divide by 1000 (or multiply by 0.001).
What is 100 kilojoules in joules?
100 kilojoules is 100,000 joules.