A megajoule (MJ) is a metric-prefixed unit of energy equal to 106 joules, using the SI mega prefix.
Megajoules to Decajoules
Convert Megajoule (MJ) to Decajoule (daJ) instantly with an exact formula, conversion table, and FAQ.
Reserved for a responsive leaderboard above the conversion details.
Professional calculator style
World-scale conversion engine
30+ categories
6,500+ units
Instant results
Offline ready
Energy calculator
Energy Converter
Convert megajoules (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 × 100000
Results update instantly for Megajoules to Decajoules conversions.
Reserved above the conversion cards and below the converter.
Formula
daJ = MJ × 100000
MJ = daJ × 0.00001
Conversion table
| 1 MJ | 100000 daJ |
| 5 MJ | 500000 daJ |
| 10 MJ | 1.000000e+06 daJ |
| 20 MJ | 2.000000e+06 daJ |
| 50 MJ | 5.000000e+06 daJ |
| 100 MJ | 1.000000e+07 daJ |
| 500 MJ | 5.000000e+07 daJ |
| 1000 MJ | 1.000000e+08 daJ |
Related conversions
Reserved between the cards and the FAQ so the page stays balanced.
How the formula works
Both megajoule and decajoule measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in megajoules by 100000 to get decajoules. To reverse the conversion, multiply a decajoule value by 0.00001 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 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 megajoules to decajoules?
Multiply the megajoule value by 100000 to get the equivalent in decajoules. For example, 5 MJ × 100000 = 500000 daJ.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 100000 is an exact, non-rounded value.
Can I convert decajoules back to megajoules?
Yes. Divide the decajoule value by 100000, or multiply it by 0.00001, to get megajoules.
Reserved between the FAQ and the article so the page stays balanced.
About converting megajoules to decajoules
A megajoule (MJ) is a metric-prefixed unit of energy equal to 106 joules, using the SI mega 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 megajoules 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.