An erg is the CGS (centimeter-gram-second) unit of energy, equal to one ten-millionth of a joule.
Ergs to Petajoules
Convert Erg (erg) to Petajoule (PJ) instantly with an exact formula, conversion table, and FAQ.
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Convert ergs (erg) to petajoules (PJ) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
A petajoule (PJ) is a metric-prefixed unit of energy equal to 1015 joules, using the SI peta prefix.
PJ = erg × 1.000000000e-22
Results update instantly for Ergs to Petajoules conversions.
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Formula
PJ = erg × 1.000000000e-22
erg = PJ × 1.000000000e+22
Conversion table
| 1 erg | 1.000000e-22 PJ |
| 5 erg | 5.000000e-22 PJ |
| 10 erg | 1.000000e-21 PJ |
| 20 erg | 2.000000e-21 PJ |
| 50 erg | 5.000000e-21 PJ |
| 100 erg | 1.000000e-20 PJ |
| 500 erg | 5.000000e-20 PJ |
| 1000 erg | 1.000000e-19 PJ |
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How the formula works
Both erg and petajoule measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in ergs by 1.000000000e-22 to get petajoules. To reverse the conversion, multiply a petajoule value by 1.000000000e+22 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 Petajoule (PJ)?
A petajoule (PJ) is a metric-prefixed unit of energy equal to 1015 joules, using the SI peta prefix.
How do I convert ergs to petajoules?
Multiply the erg value by 1.000000000e-22 to get the equivalent in petajoules. For example, 5 erg × 1.000000000e-22 = 5.000000e-22 PJ.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 1.000000000e-22 is an exact, non-rounded value.
Can I convert petajoules back to ergs?
Yes. Divide the petajoule value by 1.000000000e-22, or multiply it by 1.000000000e+22, to get ergs.
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About converting ergs to petajoules
An erg is the CGS (centimeter-gram-second) unit of energy, equal to one ten-millionth of a joule. A petajoule (PJ) is a metric-prefixed unit of energy equal to 1015 joules, using the SI peta prefix.
Use this calculator to move between ergs and petajoules accurately for homework, engineering, billing, or everyday energy calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.