The joule (J) is the SI derived unit of energy, equal to the work done when a force of one newton acts over one meter.
Joules to Ergs
Convert Joule (J) to Erg (erg) instantly with an exact formula, conversion table, and FAQ.
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Convert joules (J) to ergs (erg) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
An erg is the CGS (centimeter-gram-second) unit of energy, equal to one ten-millionth of a joule.
erg = J × 10000000
Results update instantly for Joules to Ergs conversions.
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Formula
erg = J × 10000000
J = erg × 1.000000000e-07
Conversion table
| 1 J | 1.000000e+07 erg |
| 5 J | 5.000000e+07 erg |
| 10 J | 1.000000e+08 erg |
| 20 J | 2.000000e+08 erg |
| 50 J | 5.000000e+08 erg |
| 100 J | 1.000000e+09 erg |
| 500 J | 5.000000e+09 erg |
| 1000 J | 1.000000e+10 erg |
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How the formula works
Both joule and erg measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in joules by 10000000 to get ergs. To reverse the conversion, multiply a erg value by 1.000000000e-07 to get back to joules.
Frequently asked questions
What is Joule (J)?
The joule (J) is the SI derived unit of energy, equal to the work done when a force of one newton acts over one meter.
What is Erg (erg)?
An erg is the CGS (centimeter-gram-second) unit of energy, equal to one ten-millionth of a joule.
How do I convert joules to ergs?
Multiply the joule value by 10000000 to get the equivalent in ergs. For example, 5 J × 10000000 = 5.000000e+07 erg.
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 ergs back to joules?
Yes. Divide the erg value by 10000000, or multiply it by 1.000000000e-07, to get joules.
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About converting joules to ergs
The joule (J) is the SI derived unit of energy, equal to the work done when a force of one newton acts over one meter. An erg is the CGS (centimeter-gram-second) unit of energy, equal to one ten-millionth of a joule.
Use this calculator to move between joules and ergs accurately for homework, engineering, billing, or everyday energy calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.