Joules to Kilojoules Converter
1 joule = 0.001 kilojoules
1 joule equals 0.001 kilojoules
How to convert joules to kilojoules
Calories here are thermochemical (4.184 J), while BTU uses the International Table definition. A kilowatt-hour is energy (3.6 MJ), not power; a food Calorie is a kilocalorie.
kJ = J ÷ 1000One kilojoule corresponds to 1000 joules, so divide by that figure. Displayed constants may be rounded; the converter uses the stored factor before rounding the result.
0.01 kJ = 10 ÷ 1000Joules to kilojoules conversion table
Common values in joules, converted to kilojoules.
| Joules (J) | Kilojoules (kJ) |
|---|---|
| 1 | 0.001 |
| 2 | 0.002 |
| 3 | 0.003 |
| 4 | 0.004 |
| 5 | 0.005 |
| 10 | 0.01 |
| 20 | 0.02 |
| 25 | 0.025 |
| 50 | 0.05 |
| 100 | 0.1 |
| 250 | 0.25 |
| 500 | 0.5 |
| 1,000 | 1 |
About these units
jouleJ
The SI derived unit of energy: one newton acting through one metre.
kilojoulekJ
One thousand joules. The metric food-energy unit outside the United States.
Sources and precision
Table results are rounded to 8 significant digits; formula constants may be rounded to 10. Worked example answers use 6 significant digits. The converter starts at 6 significant digits and lets you change display precision. Calculations use the stored factors without intermediate rounding. Exact unit definitions do not make an input measurement more precise; conventional and measured factors follow the assumptions stated here.