A megajoule (MJ) is a metric-prefixed unit of energy equal to 106 joules, using the SI mega prefix.
Megajoules to Joules
Convert Megajoule (MJ) to Joule (J) instantly with an exact formula, conversion table, and FAQ.
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Convert megajoules (MJ) to joules (J) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
The joule (J) is the SI derived unit of energy, equal to the work done when a force of one newton acts over one meter.
J = MJ × 1000000
Results update instantly for Megajoules to Joules conversions.
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Formula
J = MJ × 1000000
MJ = J × 0.000001
Conversion table
| 1 MJ | 1.000000e+06 J |
| 5 MJ | 5.000000e+06 J |
| 10 MJ | 1.000000e+07 J |
| 20 MJ | 2.000000e+07 J |
| 50 MJ | 5.000000e+07 J |
| 100 MJ | 1.000000e+08 J |
| 500 MJ | 5.000000e+08 J |
| 1000 MJ | 1.000000e+09 J |
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How the formula works
Both megajoule and joule measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in megajoules by 1000000 to get joules. To reverse the conversion, multiply a joule value by 0.000001 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 Joule (J)?
The joule (J) is the SI derived unit of energy, equal to the work done when a force of one newton acts over one meter.
How do I convert megajoules to joules?
Multiply the megajoule value by 1000000 to get the equivalent in joules. For example, 5 MJ × 1000000 = 5.000000e+06 J.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 1000000 is an exact, non-rounded value.
Can I convert joules back to megajoules?
Yes. Divide the joule value by 1000000, or multiply it by 0.000001, to get megajoules.
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About converting megajoules to joules
A megajoule (MJ) is a metric-prefixed unit of energy equal to 106 joules, using the SI mega prefix. The joule (J) is the SI derived unit of energy, equal to the work done when a force of one newton acts over one meter.
Use this calculator to move between megajoules and joules accurately for homework, engineering, billing, or everyday energy calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.