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.
Attojoules to Megajoules
Convert Attojoule (aJ) to Megajoule (MJ) instantly with an exact formula, conversion table, and FAQ.
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Convert attojoules (aJ) 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 = aJ × 1.000000000e-24
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Formula
MJ = aJ × 1.000000000e-24
aJ = MJ × 1.000000000e+24
Conversion table
| 1 aJ | 1.000000e-24 MJ |
| 5 aJ | 5.000000e-24 MJ |
| 10 aJ | 1.000000e-23 MJ |
| 20 aJ | 2.000000e-23 MJ |
| 50 aJ | 5.000000e-23 MJ |
| 100 aJ | 1.000000e-22 MJ |
| 500 aJ | 5.000000e-22 MJ |
| 1000 aJ | 1.000000e-21 MJ |
Related conversions
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How the formula works
Both attojoule and megajoule measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in attojoules by 1.000000000e-24 to get megajoules. To reverse the conversion, multiply a megajoule value by 1.000000000e+24 to get back to attojoules.
Frequently asked questions
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.
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 attojoules to megajoules?
Multiply the attojoule value by 1.000000000e-24 to get the equivalent in megajoules. For example, 5 aJ × 1.000000000e-24 = 5.000000e-24 MJ.
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 megajoules back to attojoules?
Yes. Divide the megajoule value by 1.000000000e-24, or multiply it by 1.000000000e+24, to get attojoules.
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About converting attojoules to megajoules
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. 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 attojoules 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.