A megajoule (MJ) is a metric-prefixed unit of energy equal to 106 joules, using the SI mega prefix.
Megajoules to Attojoules
Convert Megajoule (MJ) to Attojoule (aJ) instantly with an exact formula, conversion table, and FAQ.
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Convert megajoules (MJ) to attojoules (aJ) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
A attojoule (aJ) is a metric-prefixed unit of energy equal to 10-18 joules, a fraction of a single joule, using the SI atto prefix.
aJ = MJ × 1.000000000e+24
Results update instantly for Megajoules to Attojoules conversions.
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Formula
aJ = MJ × 1.000000000e+24
MJ = aJ × 1.000000000e-24
Conversion table
| 1 MJ | 1.000000e+24 aJ |
| 5 MJ | 5.000000e+24 aJ |
| 10 MJ | 1.000000e+25 aJ |
| 20 MJ | 2.000000e+25 aJ |
| 50 MJ | 5.000000e+25 aJ |
| 100 MJ | 1.000000e+26 aJ |
| 500 MJ | 5.000000e+26 aJ |
| 1000 MJ | 1.000000e+27 aJ |
Related conversions
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How the formula works
Both megajoule and attojoule measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in megajoules by 1.000000000e+24 to get attojoules. To reverse the conversion, multiply a attojoule value by 1.000000000e-24 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 Attojoule (aJ)?
A attojoule (aJ) is a metric-prefixed unit of energy equal to 10-18 joules, a fraction of a single joule, using the SI atto prefix.
How do I convert megajoules to attojoules?
Multiply the megajoule value by 1.000000000e+24 to get the equivalent in attojoules. For example, 5 MJ × 1.000000000e+24 = 5.000000e+24 aJ.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 1.000000000e+24 is an exact, non-rounded value.
Can I convert attojoules back to megajoules?
Yes. Divide the attojoule value by 1.000000000e+24, or multiply it by 1.000000000e-24, to get megajoules.
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About converting megajoules to attojoules
A megajoule (MJ) is a metric-prefixed unit of energy equal to 106 joules, using the SI mega prefix. A attojoule (aJ) is a metric-prefixed unit of energy equal to 10-18 joules, a fraction of a single joule, using the SI atto prefix.
Use this calculator to move between megajoules and attojoules accurately for homework, engineering, billing, or everyday energy calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.