BTU to Kilojoules
Convert btu to kilojoules instantly. 1 BTU = 1.0550558526 kJ. Includes the exact factor, a conversion table of common values and the definition of both units.
How to convert btu to kilojoules
To convert btu to kilojoules, multiply by 1.0550558526. 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.
kJ = BTU × 1.0550558526
BTU to Kilojoules conversion table
The values people look up most often, rounded for reading. Use the calculator above for anything in between.
| BTU | Kilojoules |
|---|---|
| 1 BTU | 1.055056 kJ |
| 2 BTU | 2.110112 kJ |
| 3 BTU | 3.165168 kJ |
| 5 BTU | 5.275279 kJ |
| 10 BTU | 10.550559 kJ |
| 20 BTU | 21.101117 kJ |
| 25 BTU | 26.376396 kJ |
| 50 BTU | 52.752793 kJ |
| 100 BTU | 105.505585 kJ |
| 500 BTU | 527.527926 kJ |
| 1,000 BTU | 1,055.06 kJ |
What is a btu?
British thermal unit, used for heating and air-conditioning capacity.
What is a kilojoule?
A thousand joules. Food energy is labelled in kilojoules outside the US.
The formula
kJ = BTU × 1.0550558526
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 BTU to Kilojoules
- Type the number of btu you want to convert.
- Read the result in kilojoules 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 kilojoules to btu page.
BTU to Kilojoules — frequently asked questions
How many kilojoules are in a btu?
One btu equals 1.0550558526 kJ. kJ = BTU × 1.0550558526
What is the formula to convert btu to kilojoules?
The formula is kJ = BTU × 1.0550558526. It is an exact definition rather than an approximation, so the conversion never drifts no matter how large the number.
How do I convert kilojoules back to btu?
Divide instead of multiplying: one kilojoule is 0.9478171203 BTU. 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 btu to kilojoules 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
This page answers each of these searches. They are the exact phrases visitors use to find the btu to kilojoules.
- btu to kilojoules
- 1 btu to kilojoules
- how many kilojoules in a btu
- btu2kj
- btu in kilojoules
- btu to kilojoules converter
- convert btu to kilojoules
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