A zettajoule (ZJ) is a metric-prefixed unit of energy equal to 1021 joules, using the SI zetta prefix.
Zettajoules to Ergs
Convert Zettajoule (ZJ) to Erg (erg) instantly with an exact formula, conversion table, and FAQ.
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Convert zettajoules (ZJ) 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 = ZJ × 1.000000000e+28
Results update instantly for Zettajoules to Ergs conversions.
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Formula
erg = ZJ × 1.000000000e+28
ZJ = erg × 1.000000000e-28
Conversion table
| 1 ZJ | 1.000000e+28 erg |
| 5 ZJ | 5.000000e+28 erg |
| 10 ZJ | 1.000000e+29 erg |
| 20 ZJ | 2.000000e+29 erg |
| 50 ZJ | 5.000000e+29 erg |
| 100 ZJ | 1.000000e+30 erg |
| 500 ZJ | 5.000000e+30 erg |
| 1000 ZJ | 1.000000e+31 erg |
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How the formula works
Both zettajoule and erg measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in zettajoules by 1.000000000e+28 to get ergs. To reverse the conversion, multiply a erg value by 1.000000000e-28 to get back to zettajoules.
Frequently asked questions
What is Zettajoule (ZJ)?
A zettajoule (ZJ) is a metric-prefixed unit of energy equal to 1021 joules, using the SI zetta prefix.
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 zettajoules to ergs?
Multiply the zettajoule value by 1.000000000e+28 to get the equivalent in ergs. For example, 5 ZJ × 1.000000000e+28 = 5.000000e+28 erg.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 1.000000000e+28 is an exact, non-rounded value.
Can I convert ergs back to zettajoules?
Yes. Divide the erg value by 1.000000000e+28, or multiply it by 1.000000000e-28, to get zettajoules.
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About converting zettajoules to ergs
A zettajoule (ZJ) is a metric-prefixed unit of energy equal to 1021 joules, using the SI zetta prefix. 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 zettajoules 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.