An erg is the CGS (centimeter-gram-second) unit of energy, equal to one ten-millionth of a joule.
Ergs to Megajoules
Convert Erg (erg) to Megajoule (MJ) 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 ergs (erg) 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 = erg × 1.000000000e-13
Results update instantly for Ergs to Megajoules conversions.
Reserved above the conversion cards and below the converter.
Formula
MJ = erg × 1.000000000e-13
erg = MJ × 10000000000000
Conversion table
| 1 erg | 1.000000e-13 MJ |
| 5 erg | 5.000000e-13 MJ |
| 10 erg | 1.000000e-12 MJ |
| 20 erg | 2.000000e-12 MJ |
| 50 erg | 5.000000e-12 MJ |
| 100 erg | 1.000000e-11 MJ |
| 500 erg | 5.000000e-11 MJ |
| 1000 erg | 1.000000e-10 MJ |
Related conversions
Reserved between the cards and the FAQ so the page stays balanced.
How the formula works
Both erg and megajoule measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in ergs by 1.000000000e-13 to get megajoules. To reverse the conversion, multiply a megajoule value by 10000000000000 to get back to ergs.
Frequently asked questions
What is Erg (erg)?
An erg is the CGS (centimeter-gram-second) unit of energy, equal to one ten-millionth of a joule.
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 ergs to megajoules?
Multiply the erg value by 1.000000000e-13 to get the equivalent in megajoules. For example, 5 erg × 1.000000000e-13 = 5.000000e-13 MJ.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 1.000000000e-13 is an exact, non-rounded value.
Can I convert megajoules back to ergs?
Yes. Divide the megajoule value by 1.000000000e-13, or multiply it by 10000000000000, to get ergs.
Reserved between the FAQ and the article so the page stays balanced.
About converting ergs to megajoules
An erg is the CGS (centimeter-gram-second) unit of energy, equal to one ten-millionth of a joule. 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 ergs 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.