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 to Megajoules
Convert British thermal unit (BTU) to Megajoule (MJ) instantly with an exact formula, conversion table, and FAQ.
Reserved for a responsive leaderboard above the conversion details.
Professional calculator style
World-scale conversion engine
30+ categories
6,500+ units
Instant results
Offline ready
Energy calculator
Energy Converter
Convert btu (BTU) to megajoules (MJ) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
A megajoule (MJ) is a metric-prefixed unit of energy equal to 106 joules, using the SI mega prefix.
MJ = BTU × 0.001055055853
Results update instantly for Btu to Megajoules conversions.
Reserved above the conversion cards and below the converter.
Formula
MJ = BTU × 0.001055055853
BTU = MJ × 947.8171203
Conversion table
| 1 BTU | 0.001055 MJ |
| 5 BTU | 0.005275 MJ |
| 10 BTU | 0.010551 MJ |
| 20 BTU | 0.021101 MJ |
| 50 BTU | 0.052753 MJ |
| 100 BTU | 0.105506 MJ |
| 500 BTU | 0.527528 MJ |
| 1000 BTU | 1.055056 MJ |
Related conversions
Reserved between the cards and the FAQ so the page stays balanced.
How the formula works
Both british thermal unit and megajoule measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in btu by 0.001055055853 to get megajoules. To reverse the conversion, multiply a megajoule value by 947.8171203 to get back to btu.
Frequently asked questions
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.
What is Megajoule (MJ)?
A megajoule (MJ) is a metric-prefixed unit of energy equal to 106 joules, using the SI mega prefix.
How do I convert btu to megajoules?
Multiply the british thermal unit value by 0.001055055853 to get the equivalent in megajoules. For example, 5 BTU × 0.001055055853 = 0.005275 MJ.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 0.001055055853 is an exact, non-rounded value.
Can I convert megajoules back to btu?
Yes. Divide the megajoule value by 0.001055055853, or multiply it by 947.8171203, to get btu.
Reserved between the FAQ and the article so the page stays balanced.
About converting btu to megajoules
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. A megajoule (MJ) is a metric-prefixed unit of energy equal to 106 joules, using the SI mega prefix.
Use this calculator to move between btu and megajoules accurately for homework, engineering, billing, or everyday energy calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.