An erg is a CGS energy unit.
Ergs to Centijoules Converter — erg to cJ
Convert Erg (erg) to Centijoule (cJ) using the exact conversion factor (1 erg = 0.00001 centijoule). See the formula, worked examples, and conversion table.
Ergs to Centijoules converter
Converter
Engineering Converter
Convert common stress, force, torque, power, and energy units used in engineering.
Context values
Some unit families need one extra value for a physically accurate result.
Centijoule is 0.01 joule units.
Result = input x 1e-7 / 0.01.
Energy units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Ergs to Centijoules
Erg and Centijoule both measure a quantity used in structural or mechanical engineering — commonly stress, pressure, force, torque, power, or energy — where converting between the unit conventions used in different regions, industries, or equipment specifications is a routine part of design work. Specifically: An erg is a CGS energy unit, and centijoule is 0.01 joule units.
Formula
centijoules = ergs × 0.00001
This factor comes from each unit's defined relationship to the category's base unit: 1 erg equals 1e-7 base units, and 1 centijoule equals 0.01 base units, so dividing one by the other gives the direct erg-to-centijoule factor of 0.00001.
Simple example
1 erg × 0.00001 = 0.00001 cJ
1 erg = 0.00001 centijoules.
Real-world example
100 erg × 0.00001 = 0.001 cJ
100 ergs = 0.001 centijoules.
Conversion table
| Erg (erg) | Centijoule (cJ) |
|---|---|
| 1 erg | 0.00001 cJ |
| 10 erg | 0.0001 cJ |
| 50 erg | 0.0005 cJ |
| 100 erg | 0.001 cJ |
| 500 erg | 0.005 cJ |
| 1,000 erg | 0.01 cJ |
Reverse conversion: Centijoule to Erg
0.00001 cJ × 100000 = 1 erg
0.00001 centijoules = 1 ergs.
ergs = centijoules × 100000
For a page dedicated to this direction, see Centijoule to Erg.
Understanding the Erg (erg)
An erg is a CGS energy unit.
Understanding the Centijoule (cJ)
Centijoule is 0.01 joule units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many centijoules are in 1 erg?
1 erg equals 0.00001 centijoules, using the exact defined conversion factor rather than an estimate.
How do I convert erg to centijoule?
Multiply the erg value by 0.00001. The converter above does this instantly to whatever precision you set.
How do I convert centijoule back to erg?
Use the reverse factor: 1 centijoule equals 100,000 ergs. You can also use the swap control in the converter above to flip the direction instantly.
What is a erg?
Erg (erg) is a unit of engineering.
What is a centijoule?
Centijoule (cJ) is a unit of engineering.
Is the erg to centijoule conversion exact?
Yes. Both erg and centijoule are defined by fixed standards rather than physical artifacts, so the factor of 0.00001 used above is exact to as many digits as you choose to display.
Why do engineering unit conventions vary so much by region and industry?
Pressure, force, and stress can be expressed in metric (pascal, newton), US customary (psi, pound-force), or older and industry-specific units (atmosphere, torr, kip) depending on the country, industry, and even the equipment manufacturer, which is why engineers routinely need to convert between them when working across specs from different sources.