Kilojoules to Joules

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

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⇆ Convert Joules to Kilojoules instead

Frequently asked questions

How do I convert kilojoules to joules?

Multiply the kilojoule value by 1000. So 1 kilojoule = 1000 J, and the calculator above does it instantly for any number.

How many joules are in a kilojoule?

There are 1000 joules in one kilojoule. The reference table shows the conversion for common values.

Is this kJ to J converter free?

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