A quectojoule (qJ) is a metric-prefixed unit of energy equal to 10-30 joules, a fraction of a single joule, using the SI quecto prefix.
Quectojoules to Ergs
Convert Quectojoule (qJ) to Erg (erg) 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 quectojoules (qJ) 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 = qJ × 1.000000000e-23
Results update instantly for Quectojoules to Ergs conversions.
Reserved above the conversion cards and below the converter.
Formula
erg = qJ × 1.000000000e-23
qJ = erg × 1.000000000e+23
Conversion table
| 1 qJ | 1.000000e-23 erg |
| 5 qJ | 5.000000e-23 erg |
| 10 qJ | 1.000000e-22 erg |
| 20 qJ | 2.000000e-22 erg |
| 50 qJ | 5.000000e-22 erg |
| 100 qJ | 1.000000e-21 erg |
| 500 qJ | 5.000000e-21 erg |
| 1000 qJ | 1.000000e-20 erg |
Related conversions
Reserved between the cards and the FAQ so the page stays balanced.
How the formula works
Both quectojoule and erg measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in quectojoules by 1.000000000e-23 to get ergs. To reverse the conversion, multiply a erg value by 1.000000000e+23 to get back to quectojoules.
Frequently asked questions
What is Quectojoule (qJ)?
A quectojoule (qJ) is a metric-prefixed unit of energy equal to 10-30 joules, a fraction of a single joule, using the SI quecto 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 quectojoules to ergs?
Multiply the quectojoule value by 1.000000000e-23 to get the equivalent in ergs. For example, 5 qJ × 1.000000000e-23 = 5.000000e-23 erg.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 1.000000000e-23 is an exact, non-rounded value.
Can I convert ergs back to quectojoules?
Yes. Divide the erg value by 1.000000000e-23, or multiply it by 1.000000000e+23, to get quectojoules.
Reserved between the FAQ and the article so the page stays balanced.
About converting quectojoules to ergs
A quectojoule (qJ) is a metric-prefixed unit of energy equal to 10-30 joules, a fraction of a single joule, using the SI quecto 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 quectojoules 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.