BTU to Megajoules
Convert btu to megajoules instantly. 1 BTU = 0.0010550559 MJ. Includes the exact factor, a conversion table of common values and the definition of both units.
How to convert btu to megajoules
To convert btu to megajoules, divide by 947.8171203133 (multiply by 0.0010550559). 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.
MJ = BTU × 0.0010550559
BTU to Megajoules conversion table
The values people look up most often, rounded for reading. Use the calculator above for anything in between.
| BTU | Megajoules |
|---|---|
| 1 BTU | 0.001055 MJ |
| 2 BTU | 0.00211 MJ |
| 3 BTU | 0.003165 MJ |
| 5 BTU | 0.005275 MJ |
| 10 BTU | 0.010551 MJ |
| 20 BTU | 0.021101 MJ |
| 25 BTU | 0.026376 MJ |
| 50 BTU | 0.052753 MJ |
| 100 BTU | 0.105506 MJ |
| 500 BTU | 0.527528 MJ |
| 1,000 BTU | 1.055056 MJ |
What is a btu?
British thermal unit, used for heating and air-conditioning capacity.
What is a megajoule?
A million joules, used for fuel energy content and gas billing.
The formula
MJ = BTU × 0.0010550559
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 Megajoules
- Type the number of btu you want to convert.
- Read the result in megajoules 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 megajoules to btu page.
BTU to Megajoules — frequently asked questions
How many megajoules are in a btu?
One btu equals 0.0010550559 MJ. MJ = BTU × 0.0010550559
What is the formula to convert btu to megajoules?
The formula is MJ = BTU × 0.0010550559. It is an exact definition rather than an approximation, so the conversion never drifts no matter how large the number.
How do I convert megajoules back to btu?
Divide instead of multiplying: one megajoule is 947.8171203133 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 megajoules 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 megajoules.
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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