A megajoule (MJ) is a metric-prefixed unit of energy equal to 106 joules, using the SI mega prefix.
Megajoules to Decijoules
Convert Megajoule (MJ) to Decijoule (dJ) instantly with an exact formula, conversion table, and FAQ.
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Convert megajoules (MJ) to decijoules (dJ) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
A decijoule (dJ) is a metric-prefixed unit of energy equal to 10-1 joules, a fraction of a single joule, using the SI deci prefix.
dJ = MJ × 10000000
Results update instantly for Megajoules to Decijoules conversions.
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Formula
dJ = MJ × 10000000
MJ = dJ × 1.000000000e-07
Conversion table
| 1 MJ | 1.000000e+07 dJ |
| 5 MJ | 5.000000e+07 dJ |
| 10 MJ | 1.000000e+08 dJ |
| 20 MJ | 2.000000e+08 dJ |
| 50 MJ | 5.000000e+08 dJ |
| 100 MJ | 1.000000e+09 dJ |
| 500 MJ | 5.000000e+09 dJ |
| 1000 MJ | 1.000000e+10 dJ |
Related conversions
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How the formula works
Both megajoule and decijoule measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in megajoules by 10000000 to get decijoules. To reverse the conversion, multiply a decijoule value by 1.000000000e-07 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 Decijoule (dJ)?
A decijoule (dJ) is a metric-prefixed unit of energy equal to 10-1 joules, a fraction of a single joule, using the SI deci prefix.
How do I convert megajoules to decijoules?
Multiply the megajoule value by 10000000 to get the equivalent in decijoules. For example, 5 MJ × 10000000 = 5.000000e+07 dJ.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 10000000 is an exact, non-rounded value.
Can I convert decijoules back to megajoules?
Yes. Divide the decijoule value by 10000000, or multiply it by 1.000000000e-07, to get megajoules.
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About converting megajoules to decijoules
A megajoule (MJ) is a metric-prefixed unit of energy equal to 106 joules, using the SI mega prefix. A decijoule (dJ) is a metric-prefixed unit of energy equal to 10-1 joules, a fraction of a single joule, using the SI deci prefix.
Use this calculator to move between megajoules and decijoules accurately for homework, engineering, billing, or everyday energy calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.