How to Convert Megajoules to British thermal units (MJ to BTU)
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 megajoules into british thermal units by hand, with examples and a quick-reference table.
The conversion
To convert megajoules to british thermal units, multiply the value by 947.817122667. To go the other way, divide by the same number (or multiply by 0.0010550558). For a quick estimate, multiply by about 950.
British thermal units = megajoules × 947.817122667
Worked examples
- 3 MJ = 2,843.45 BTU
- 12.5 MJ = 11,847.71 BTU
- 75 MJ = 71,086.28 BTU
Megajoules to British thermal units table
| Megajoules | British thermal units |
|---|---|
| 1 MJ | 947.8171 BTU |
| 2 MJ | 1,895.63 BTU |
| 5 MJ | 4,739.09 BTU |
| 10 MJ | 9,478.17 BTU |
| 20 MJ | 18,956.34 BTU |
| 25 MJ | 23,695.43 BTU |
| 50 MJ | 47,390.86 BTU |
| 100 MJ | 94,781.71 BTU |
| 250 MJ | 236,954.28 BTU |
| 500 MJ | 473,908.56 BTU |
| 1,000 MJ | 947,817.12 BTU |
Common questions
Is MJ to BTU 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 British thermal units to Megajoules converter.
Mistakes to avoid
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.
Dropping the units
A bare number without a unit is easy to misread later. Always write the unit with the result.
Background
For everyday use, three or four significant figures are usually enough. Engineering, science and trade documents may need more, and rounding should happen only at the end of a calculation.
A conversion table is handy for common values, but a calculator is faster and avoids interpolation errors for anything in between.
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.
For any value, use the Megajoules to British thermal units Converter or browse all energy converters.
Run your own numbers: Megajoules to British thermal units Converter