BTU to Kilojoules

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

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⇆ Convert Kilojoules to BTU instead

Frequently asked questions

How do I convert BTU to kilojoules?

Multiply the BTU value by 1.05506. So 1 BTU = 1.05506 kJ, and the calculator above does it instantly for any number.

How many kilojoules are in a BTU?

There are 1.05506 kilojoules in one BTU. The reference table shows the conversion for common values.

Is this BTU to kJ converter free?

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