How to Convert British thermal units to Megajoules (BTU to MJ)
Energy conversions link food labels in kJ and kcal, SP Group bills in kWh and air-conditioner capacity in BTU. This guide shows how to convert british thermal units into megajoules by hand, with examples and a quick-reference table.
The conversion
To convert british thermal units to megajoules, multiply the value by 0.0010550558. To go the other way, divide by the same number (or multiply by 947.817122667). For a quick estimate, multiply by about 0.0011.
Megajoules = british thermal units × 0.0010550558
Worked examples
- 3 BTU = 0.003165 MJ
- 12.5 BTU = 0.013188 MJ
- 75 BTU = 0.079129 MJ
British thermal units to Megajoules table
| British thermal units | Megajoules |
|---|---|
| 1 BTU | 0.001055 MJ |
| 2 BTU | 0.00211 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 |
| 250 BTU | 0.263764 MJ |
| 500 BTU | 0.527528 MJ |
| 1,000 BTU | 1.0551 MJ |
Common questions
Is BTU to MJ exact?
The factors used here are the internationally defined values where they exist; results are rounded for display only.
How do I convert back?
Use the Megajoules to British thermal units converter.
Mistakes to avoid
Dropping the units
A bare number without a unit is easy to misread later. Always write the unit with the result.
Rounding the factor too early
Using 3 instead of 3.28 for feet per metre introduces an error of almost 9% before you have started.
Multiplying when you should divide
Converting to a smaller unit gives a bigger number, and converting to a larger unit gives a smaller one. If your answer moves the wrong way, you have inverted the factor.
Background
Unit conversion is simply multiplication by a fixed ratio. The ratio between two units of the same quantity never changes, so once you know it you can convert any value in either direction.
Singapore adopted the metric system in the 1970s, replacing imperial units and traditional Chinese measures in most official uses. Metric units are now standard in schools, trade and government, but older units survive in property, markets and imported goods.
A conversion table is handy for common values, but a calculator is faster and avoids interpolation errors for anything in between.
For any value, use the British thermal units to Megajoules Converter or browse all energy converters.
Run your own numbers: British thermal units to Megajoules Converter