A megajoule (MJ) is a metric-prefixed unit of energy equal to 106 joules, using the SI mega prefix.
Megajoules to Btu
Convert Megajoule (MJ) to British thermal unit (BTU) instantly with an exact formula, conversion table, and FAQ.
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Convert megajoules (MJ) to btu (BTU) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
The British thermal unit (BTU) is the energy needed to raise one pound of water by one degree Fahrenheit, widely used for heating and air-conditioning ratings.
BTU = MJ × 947.8171203
Results update instantly for Megajoules to Btu conversions.
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Formula
BTU = MJ × 947.8171203
MJ = BTU × 0.001055055853
Conversion table
| 1 MJ | 947.817120 BTU |
| 5 MJ | 4739.085602 BTU |
| 10 MJ | 9478.171203 BTU |
| 20 MJ | 18956.342406 BTU |
| 50 MJ | 47390.856016 BTU |
| 100 MJ | 94781.712031 BTU |
| 500 MJ | 473908.560157 BTU |
| 1000 MJ | 947817.120313 BTU |
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How the formula works
Both megajoule and british thermal unit measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in megajoules by 947.8171203 to get btu. To reverse the conversion, multiply a british thermal unit value by 0.001055055853 to get back to megajoules.
Frequently asked questions
What is Megajoule (MJ)?
A megajoule (MJ) is a metric-prefixed unit of energy equal to 106 joules, using the SI mega prefix.
What is British thermal unit (BTU)?
The British thermal unit (BTU) is the energy needed to raise one pound of water by one degree Fahrenheit, widely used for heating and air-conditioning ratings.
How do I convert megajoules to btu?
Multiply the megajoule value by 947.8171203 to get the equivalent in btu. For example, 5 MJ × 947.8171203 = 4739.085602 BTU.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 947.8171203 is an exact, non-rounded value.
Can I convert btu back to megajoules?
Yes. Divide the british thermal unit value by 947.8171203, or multiply it by 0.001055055853, to get megajoules.
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About converting megajoules to btu
A megajoule (MJ) is a metric-prefixed unit of energy equal to 106 joules, using the SI mega prefix. The British thermal unit (BTU) is the energy needed to raise one pound of water by one degree Fahrenheit, widely used for heating and air-conditioning ratings.
Use this calculator to move between megajoules and btu accurately for homework, engineering, billing, or everyday energy calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.