A millijoule (mJ) is a metric-prefixed unit of energy equal to 10-3 joules, a fraction of a single joule, using the SI milli prefix.
Millijoules to Decajoules
Convert Millijoule (mJ) to Decajoule (daJ) instantly with an exact formula, conversion table, and FAQ.
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Convert millijoules (mJ) to decajoules (daJ) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
A decajoule (daJ) is a metric-prefixed unit of energy equal to 101 joules, using the SI deca prefix.
daJ = mJ × 0.0001
Results update instantly for Millijoules to Decajoules conversions.
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Formula
daJ = mJ × 0.0001
mJ = daJ × 10000
Conversion table
| 1 mJ | 0.000100 daJ |
| 5 mJ | 0.000500 daJ |
| 10 mJ | 0.001000 daJ |
| 20 mJ | 0.002000 daJ |
| 50 mJ | 0.005000 daJ |
| 100 mJ | 0.010000 daJ |
| 500 mJ | 0.050000 daJ |
| 1000 mJ | 0.100000 daJ |
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How the formula works
Both millijoule and decajoule measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in millijoules by 0.0001 to get decajoules. To reverse the conversion, multiply a decajoule value by 10000 to get back to millijoules.
Frequently asked questions
What is Millijoule (mJ)?
A millijoule (mJ) is a metric-prefixed unit of energy equal to 10-3 joules, a fraction of a single joule, using the SI milli prefix.
What is Decajoule (daJ)?
A decajoule (daJ) is a metric-prefixed unit of energy equal to 101 joules, using the SI deca prefix.
How do I convert millijoules to decajoules?
Multiply the millijoule value by 0.0001 to get the equivalent in decajoules. For example, 5 mJ × 0.0001 = 0.000500 daJ.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 0.0001 is an exact, non-rounded value.
Can I convert decajoules back to millijoules?
Yes. Divide the decajoule value by 0.0001, or multiply it by 10000, to get millijoules.
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About converting millijoules to decajoules
A millijoule (mJ) is a metric-prefixed unit of energy equal to 10-3 joules, a fraction of a single joule, using the SI milli prefix. A decajoule (daJ) is a metric-prefixed unit of energy equal to 101 joules, using the SI deca prefix.
Use this calculator to move between millijoules and decajoules accurately for homework, engineering, billing, or everyday energy calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.