Joules to Kilojoules

Convert joules to kilojoules. Live result, plus a quick-reference table for common values.

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⇆ Convert Kilojoules to Joules instead

Frequently asked questions

How do I convert joules to kilojoules?

Multiply the joule value by 0.001. So 1 joule = 0.001 kJ, and the calculator above does it instantly for any number.

How many kilojoules are in a joule?

There are 0.001 kilojoules in one joule. The reference table shows the conversion for common values.

Is this J to kJ converter free?

Yes, completely free, no sign-up, and it runs entirely in your browser, so nothing is uploaded.