⚡ J to kJ — Joule to Kilojoule Converter
Convert energy units — joules, calories, kilowatt-hours, BTU, kilojoules.
All Joule conversions
| Unit | Name | Value |
|---|---|---|
| kJ | Kilojoule | 0.001 |
| cal | Calorie | 0.23900574 |
| kcal | Kilocalorie (Cal) | 0.00023900574 |
| kWh | Kilowatt-hour | 2.7777778e-7 |
| BTU | BTU | 0.00094781339 |
Related Energy conversions
About Joule to Kilojoule Conversion
The Joule (J) and the Kilojoule (kJ) are both units of energy. Converting between them is straightforward using the formula above.
Formula: 1 J = 0.001 kJ
This converter uses internationally recognized conversion factors. All calculations are performed client-side in your browser — no data is sent to any server.
Frequently Asked Questions
How do I convert Joule to Kilojoule?
Use the converter above — enter your value in Joule and the result appears instantly in Kilojoule. The formula is: 1 J = 0.001 kJ
How many Kilojoule are in 100 Joule?
100 J = 0.1 kJ
What is 1 Joule in Kilojoule?
1 J = 0.001 kJ
Is this Joule to Kilojoule converter free?
Yes — Unitafy is completely free, requires no signup, and works instantly in your browser.