A megajoule (MJ) is a metric-prefixed unit of energy equal to 106 joules, using the SI mega prefix.
Megajoules to Exajoules
Convert Megajoule (MJ) to Exajoule (EJ) instantly with an exact formula, conversion table, and FAQ.
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Convert megajoules (MJ) to exajoules (EJ) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
A exajoule (EJ) is a metric-prefixed unit of energy equal to 1018 joules, using the SI exa prefix.
EJ = MJ × 1.000000000e-12
Results update instantly for Megajoules to Exajoules conversions.
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Formula
EJ = MJ × 1.000000000e-12
MJ = EJ × 1000000000000
Conversion table
| 1 MJ | 1.000000e-12 EJ |
| 5 MJ | 5.000000e-12 EJ |
| 10 MJ | 1.000000e-11 EJ |
| 20 MJ | 2.000000e-11 EJ |
| 50 MJ | 5.000000e-11 EJ |
| 100 MJ | 1.000000e-10 EJ |
| 500 MJ | 5.000000e-10 EJ |
| 1000 MJ | 1.000000e-09 EJ |
Related conversions
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How the formula works
Both megajoule and exajoule measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in megajoules by 1.000000000e-12 to get exajoules. To reverse the conversion, multiply a exajoule value by 1000000000000 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 Exajoule (EJ)?
A exajoule (EJ) is a metric-prefixed unit of energy equal to 1018 joules, using the SI exa prefix.
How do I convert megajoules to exajoules?
Multiply the megajoule value by 1.000000000e-12 to get the equivalent in exajoules. For example, 5 MJ × 1.000000000e-12 = 5.000000e-12 EJ.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 1.000000000e-12 is an exact, non-rounded value.
Can I convert exajoules back to megajoules?
Yes. Divide the exajoule value by 1.000000000e-12, or multiply it by 1000000000000, to get megajoules.
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About converting megajoules to exajoules
A megajoule (MJ) is a metric-prefixed unit of energy equal to 106 joules, using the SI mega prefix. A exajoule (EJ) is a metric-prefixed unit of energy equal to 1018 joules, using the SI exa prefix.
Use this calculator to move between megajoules and exajoules accurately for homework, engineering, billing, or everyday energy calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.