joules to kilojoules Converter
Convert joules to kilojoules instantly. Includes a reference table and formula.
| joules | kilojoules |
|---|
How to convert joules to kilojoules
Enter your value
Type the number of joules you want to convert into the left box. The result in kilojoules appears instantly in the right box. You can also type into the right box to convert in the other direction.
Use the swap button
Click the ⇄ Swap button to reverse the conversion — kilojoules to joules. Your current value carries across so you don't have to re-enter anything.
About joules and kilojoules
joules and kilojoules are both energy. Use this converter to switch between them instantly.
1 kJ = 1,000 J. A food Calorie (kcal) = 4.184 kJ. EU food labels use kJ: 2,000 kcal = 8,368 kJ per day. A lightning bolt releases about 1 billion J = 1 GJ. A 1 kWh of electricity = 3,600 kJ = 860 kcal — roughly equivalent to the energy in a Mars Bar.
| joules | kilojoules |
|---|---|
| 100 | 0.1 |
| 500 | 0.5 |
| 1000 | 1 |
| 2000 | 2 |
| 5000 | 5 |
| 10000 | 10 |
Frequently asked questions
How do I convert joules to kilojoules?
To convert joules to kilojoules, multiply by 0.001. Or use the calculator above for instant results.
How many kilojoules are in 1 joules?
1 joules equals 0.001 kilojoules.
Is the joules to kilojoules converter free?
Yes, the joules to kilojoules converter is completely free with no sign-up required, no downloads, and it works offline once the page has loaded.