kJ to J
Convert Kilojoule to Joule
Convert Kilojoule to Joule instantly with the tool above. The conversion factor is 1,000, meaning 1 kilojoule equals 1,000 joules. Type any value and the result updates immediately — no ads, no page reloads, no clutter.
Type a number above. The result updates instantly — no buttons, no reloads.
1 Kilojoule = 1,000 joules
1 Joule = 0.001 kilojoules
Quick reference
Common kilojoules converted to joules at a glance.
| kJ | J |
|---|---|
| 1 | 1,000 |
| 2 | 2,000 |
| 5 | 5,000 |
| 10 | 10,000 |
| 25 | 25,000 |
| 50 | 50,000 |
| 100 | 100,000 |
| 500 | 500,000 |
| 1,000 | 1,000,000 |
How to convert kilojoules to joules
To convert a value from kilojoules to joules, multiply the kilojoule value by 1,000 joules. For example, 10 kilojoules × that factor = 10,000 joules.
This kilojoule to joule converter runs entirely in your browser, so results appear instantly with no page reload, no advertisements and no sign-up.
Frequently asked questions
How many joules are in 1 kilojoule?+
1 kilojoule is equal to 1,000 joules.
How do you convert kilojoules to joules?+
To convert kilojoules to joules, multiply the kilojoule value by 1,000. For example, 10 kilojoules × 1,000 = 10,000 joules.
What is the formula to convert kilojoules to joules?+
Kilojoule → Joule: value × 1,000. Equivalently, 1 kilojoule = 1,000 joules.
Is this Kilojoule to Joule converter free to use?+
Yes. This kilojoule to joule converter is completely free, works instantly in your browser, and contains no advertisements, popups or sign-up.