Kilojoules to Joules formula
joules = kilojoules × 1,000
Multiply the number of kilojoules by 1,000 to get joules. To go the other way, multiply by 0.001 instead, or use the joules to kj converter.
Kilojoules to Joules conversion table
Common kj to joules values, rounded for reading. The converter above keeps full precision.
| Kilojoules | Joules |
|---|---|
| 1 kJ | 1,000 J |
| 2 kJ | 2,000 J |
| 3 kJ | 3,000 J |
| 4 kJ | 4,000 J |
| 5 kJ | 5,000 J |
| 10 kJ | 10,000 J |
| 15 kJ | 15,000 J |
| 20 kJ | 20,000 J |
| 25 kJ | 25,000 J |
| 50 kJ | 50,000 J |
| 75 kJ | 75,000 J |
| 100 kJ | 100,000 J |
| 250 kJ | 250,000 J |
| 500 kJ | 500,000 J |
| 1,000 kJ | 1,000,000 J |
Worked example
To convert 10 kJ to joules, multiply by 1,000: the result is 10,000 J. A nutritional Calorie is a kilocalorie, equal to 4,184 joules. The smaller scientific calorie equals 4.184 joules.
Frequently asked questions
How many joules are in a kilojoule?
One kilojoule equals 1,000 joules (1 kJ = 1,000 J).
What is 10 kilojoules in joules?
10 kJ converts to 10,000 J. Enter any other value in the converter above to see it recalculated instantly.
How do I convert joules back to kilojoules?
Reverse the calculation: one joule equals 0.001 kilojoules. You can also swap the units in the converter or open the joules to kj page.
Related energy conversions
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