An erg is a CGS energy unit.
Ergs to Attojoules Converter — erg to aJ
Convert Erg (erg) to Attojoule (aJ) using the exact conversion factor (1 erg = 100,000,000,000 attojoule). See the formula, worked examples, and conversion table.
Ergs to Attojoules 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.
Attojoule is 1e-18 joule units.
Result = input x 1e-7 / 1e-18.
Energy units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Ergs to Attojoules
Erg and Attojoule 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 attojoule is 1e-18 joule units.
Formula
attojoules = ergs × 100000000000
This factor comes from each unit's defined relationship to the category's base unit: 1 erg equals 1e-7 base units, and 1 attojoule equals 1e-18 base units, so dividing one by the other gives the direct erg-to-attojoule factor of 100000000000.
Simple example
1 erg × 100000000000 = 100,000,000,000 aJ
1 erg = 100,000,000,000 attojoules.
Real-world example
100 erg × 100000000000 = 1e+13 aJ
100 ergs = 1e+13 attojoules.
Conversion table
| Erg (erg) | Attojoule (aJ) |
|---|---|
| 1 erg | 100,000,000,000 aJ |
| 10 erg | 1,000,000,000,000 aJ |
| 50 erg | 5e+12 aJ |
| 100 erg | 1e+13 aJ |
| 500 erg | 5e+13 aJ |
| 1,000 erg | 1e+14 aJ |
Reverse conversion: Attojoule to Erg
1 aJ × 1e-11 = 1e-11 erg
1 attojoule = 1e-11 ergs.
ergs = attojoules × 1e-11
For a page dedicated to this direction, see Attojoule to Erg.
Understanding the Erg (erg)
An erg is a CGS energy unit.
Understanding the Attojoule (aJ)
Attojoule is 1e-18 joule units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many attojoules are in 1 erg?
1 erg equals 100,000,000,000 attojoules, using the exact defined conversion factor rather than an estimate.
How do I convert erg to attojoule?
Multiply the erg value by 100000000000. The converter above does this instantly to whatever precision you set.
How do I convert attojoule back to erg?
Use the reverse factor: 1 attojoule equals 1e-11 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 attojoule?
Attojoule (aJ) is a unit of engineering.
Is the erg to attojoule conversion exact?
Yes. Both erg and attojoule are defined by fixed standards rather than physical artifacts, so the factor of 100000000000 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.