A hectojoule (hJ) is a metric-prefixed unit of energy equal to 102 joules, using the SI hecto prefix.
Hectojoules to Ergs
Convert Hectojoule (hJ) 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 hectojoules (hJ) 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 = hJ × 1000000000
Results update instantly for Hectojoules to Ergs conversions.
Reserved above the conversion cards and below the converter.
Formula
erg = hJ × 1000000000
hJ = erg × 1.000000000e-09
Conversion table
| 1 hJ | 1.000000e+09 erg |
| 5 hJ | 5.000000e+09 erg |
| 10 hJ | 1.000000e+10 erg |
| 20 hJ | 2.000000e+10 erg |
| 50 hJ | 5.000000e+10 erg |
| 100 hJ | 1.000000e+11 erg |
| 500 hJ | 5.000000e+11 erg |
| 1000 hJ | 1.000000e+12 erg |
Related conversions
Reserved between the cards and the FAQ so the page stays balanced.
How the formula works
Both hectojoule and erg measure the same physical quantity, so converting between them is a single multiplication. Multiply a value in hectojoules by 1000000000 to get ergs. To reverse the conversion, multiply a erg value by 1.000000000e-09 to get back to hectojoules.
Frequently asked questions
What is Hectojoule (hJ)?
A hectojoule (hJ) is a metric-prefixed unit of energy equal to 102 joules, using the SI hecto 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 hectojoules to ergs?
Multiply the hectojoule value by 1000000000 to get the equivalent in ergs. For example, 5 hJ × 1000000000 = 5.000000e+09 erg.
Is this conversion exact?
Yes. Both units are defined against the SI base unit for this dimension, so the factor 1000000000 is an exact, non-rounded value.
Can I convert ergs back to hectojoules?
Yes. Divide the erg value by 1000000000, or multiply it by 1.000000000e-09, to get hectojoules.
Reserved between the FAQ and the article so the page stays balanced.
About converting hectojoules to ergs
A hectojoule (hJ) is a metric-prefixed unit of energy equal to 102 joules, using the SI hecto 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 hectojoules 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.