An erg is the CGS (centimeter-gram-second) unit of energy, equal to one ten-millionth of a joule.
Ergs to Zettajoules
Convert Erg (erg) to Zettajoule (ZJ) 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 zettajoules (ZJ) instantly with formula, conversion table, and FAQ.
Context values
Some unit families need one extra value for a physically accurate result.
A zettajoule (ZJ) is a metric-prefixed unit of energy equal to 1021 joules, using the SI zetta prefix.
ZJ = erg × 1.000000000e-28
Results update instantly for Ergs to Zettajoules conversions.
Reserved above the conversion cards and below the converter.
Formula
ZJ = erg × 1.000000000e-28
erg = ZJ × 1.000000000e+28
Conversion table
| 1 erg | 1.000000e-28 ZJ |
| 5 erg | 5.000000e-28 ZJ |
| 10 erg | 1.000000e-27 ZJ |
| 20 erg | 2.000000e-27 ZJ |
| 50 erg | 5.000000e-27 ZJ |
| 100 erg | 1.000000e-26 ZJ |
| 500 erg | 5.000000e-26 ZJ |
| 1000 erg | 1.000000e-25 ZJ |
Related conversions
Reserved between the cards and the FAQ so the page stays balanced.
How the formula works
Both erg and zettajoule measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in ergs by 1.000000000e-28 to get zettajoules. To reverse the conversion, multiply a zettajoule value by 1.000000000e+28 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 Zettajoule (ZJ)?
A zettajoule (ZJ) is a metric-prefixed unit of energy equal to 1021 joules, using the SI zetta prefix.
How do I convert ergs to zettajoules?
Multiply the erg value by 1.000000000e-28 to get the equivalent in zettajoules. For example, 5 erg × 1.000000000e-28 = 5.000000e-28 ZJ.
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 zettajoules back to ergs?
Yes. Divide the zettajoule value by 1.000000000e-28, or multiply it by 1.000000000e+28, to get ergs.
Reserved between the FAQ and the article so the page stays balanced.
About converting ergs to zettajoules
An erg is the CGS (centimeter-gram-second) unit of energy, equal to one ten-millionth of a joule. A zettajoule (ZJ) is a metric-prefixed unit of energy equal to 1021 joules, using the SI zetta prefix.
Use this calculator to move between ergs and zettajoules accurately for homework, engineering, billing, or everyday energy calculations. The Universal Converter uses exact unit factors, so results stay consistent across the site.