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.
Joules to Megajoules
Convert Joule (J) 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 joules (J) 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 = J × 0.000001
Results update instantly for Joules to Megajoules conversions.
Reserved above the conversion cards and below the converter.
Formula
MJ = J × 0.000001
J = MJ × 1000000
Conversion table
| 1 J | 0.000001 MJ |
| 5 J | 0.000005 MJ |
| 10 J | 0.000010 MJ |
| 20 J | 0.000020 MJ |
| 50 J | 0.000050 MJ |
| 100 J | 0.000100 MJ |
| 500 J | 0.000500 MJ |
| 1000 J | 0.001000 MJ |
Related conversions
Reserved between the cards and the FAQ so the page stays balanced.
How the formula works
Both joule and megajoule measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in joules by 0.000001 to get megajoules. To reverse the conversion, multiply a megajoule value by 1000000 to get back to joules.
Frequently asked questions
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.
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 joules to megajoules?
Multiply the joule value by 0.000001 to get the equivalent in megajoules. For example, 5 J × 0.000001 = 0.000005 MJ.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 0.000001 is an exact, non-rounded value.
Can I convert megajoules back to joules?
Yes. Divide the megajoule value by 0.000001, or multiply it by 1000000, to get joules.
Reserved between the FAQ and the article so the page stays balanced.
About converting joules to megajoules
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. 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 joules 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.