An erg is the CGS (centimeter-gram-second) unit of energy, equal to one ten-millionth of a joule.
Ergs to Microjoules
Convert Erg (erg) to Microjoule (uJ) instantly with an exact formula, conversion table, and FAQ.
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Convert ergs (erg) to microjoules (uJ) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
A microjoule (uJ) is a metric-prefixed unit of energy equal to 10-6 joules, a fraction of a single joule, using the SI micro prefix.
uJ = erg × 0.1
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Formula
uJ = erg × 0.1
erg = uJ × 10
Conversion table
| 1 erg | 0.100000 uJ |
| 5 erg | 0.500000 uJ |
| 10 erg | 1 uJ |
| 20 erg | 2 uJ |
| 50 erg | 5 uJ |
| 100 erg | 10 uJ |
| 500 erg | 50 uJ |
| 1000 erg | 100 uJ |
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How the formula works
Both erg and microjoule measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in ergs by 0.1 to get microjoules. To reverse the conversion, multiply a microjoule value by 10 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 Microjoule (uJ)?
A microjoule (uJ) is a metric-prefixed unit of energy equal to 10-6 joules, a fraction of a single joule, using the SI micro prefix.
How do I convert ergs to microjoules?
Multiply the erg value by 0.1 to get the equivalent in microjoules. For example, 5 erg × 0.1 = 0.500000 uJ.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 0.1 is an exact, non-rounded value.
Can I convert microjoules back to ergs?
Yes. Divide the microjoule value by 0.1, or multiply it by 10, to get ergs.
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About converting ergs to microjoules
An erg is the CGS (centimeter-gram-second) unit of energy, equal to one ten-millionth of a joule. A microjoule (uJ) is a metric-prefixed unit of energy equal to 10-6 joules, a fraction of a single joule, using the SI micro prefix.
Use this calculator to move between ergs and microjoules accurately for homework, engineering, billing, or everyday energy calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.