Kilojoules to BTU
Convert kilojoules to btu instantly. 1 kJ = 0.9478171203 BTU. Includes the exact factor, a conversion table of common values and the definition of both units.
How to convert kilojoules to btu
To convert kilojoules to btu, divide by 1.0550558526 (multiply by 0.9478171203). The relationship is fixed, so the same factor works for any quantity — there is nothing to look up and nothing that changes with temperature, location or context.
BTU = kJ × 0.9478171203
Kilojoules to BTU conversion table
The values people look up most often, rounded for reading. Use the calculator above for anything in between.
| Kilojoules | BTU |
|---|---|
| 1 kJ | 0.947817 BTU |
| 2 kJ | 1.895634 BTU |
| 3 kJ | 2.843451 BTU |
| 5 kJ | 4.739086 BTU |
| 10 kJ | 9.478171 BTU |
| 20 kJ | 18.956342 BTU |
| 25 kJ | 23.695428 BTU |
| 50 kJ | 47.390856 BTU |
| 100 kJ | 94.781712 BTU |
| 500 kJ | 473.90856 BTU |
| 1,000 kJ | 947.81712 BTU |
What is a kilojoule?
A thousand joules. Food energy is labelled in kilojoules outside the US.
What is a btu?
British thermal unit, used for heating and air-conditioning capacity.
The formula
BTU = kJ × 0.9478171203
Every result on this page comes from this formula. Nothing is rounded until the final display, so figures match a spreadsheet to the cent.
How to use the Kilojoules to BTU
- Type the number of kilojoules you want to convert.
- Read the result in btu straight away — there is no button to press.
- Check the table below for the values that come up most often, or reverse the conversion with the linked btu to kilojoules page.
Kilojoules to BTU — frequently asked questions
How many btu are in a kilojoule?
One kilojoule equals 0.9478171203 BTU. BTU = kJ × 0.9478171203
What is the formula to convert kilojoules to btu?
The formula is BTU = kJ × 0.9478171203. It is an exact definition rather than an approximation, so the conversion never drifts no matter how large the number.
How do I convert btu back to kilojoules?
Divide instead of multiplying: one btu is 1.0550558526 kJ. The reverse converter is linked in the related tools list.
Is this conversion exact?
Yes. Both units are defined against the same base unit by international agreement, so the factor is exact — any rounding you see is only in the display, which you can widen by entering more decimal places.
Is this kilojoules to btu free to use?
Yes. Every calculator on the site is free, needs no sign-up, and runs entirely in your browser, so your figures never leave your device.
What people search for
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About this calculator
Written and reviewed by The Samsung Calculator editorial team. Every calculator is written against a published formula, reviewed against at least one independent reference implementation, and dated when it changes.
Last reviewed August 19, 2026 · Calculation runs client-side · No data collected · Report an error