An erg is a CGS energy unit.
Ergs to Nanojoules Converter — erg to nJ
Convert Erg (erg) to Nanojoule (nJ) using the exact conversion factor (1 erg = 100 nanojoule). See the formula, worked examples, and conversion table.
Ergs to Nanojoules 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.
Nanojoule is 1e-9 joule units.
Result = input x 1e-7 / 1e-9.
Energy units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Ergs to Nanojoules
Erg and Nanojoule 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 nanojoule is 1e-9 joule units.
Formula
nanojoules = ergs × 100
This factor comes from each unit's defined relationship to the category's base unit: 1 erg equals 1e-7 base units, and 1 nanojoule equals 1e-9 base units, so dividing one by the other gives the direct erg-to-nanojoule factor of 100.
Simple example
1 erg × 100 = 100 nJ
1 erg = 100 nanojoules.
Real-world example
100 erg × 100 = 10,000 nJ
100 ergs = 10,000 nanojoules.
Conversion table
| Erg (erg) | Nanojoule (nJ) |
|---|---|
| 1 erg | 100 nJ |
| 10 erg | 1,000 nJ |
| 50 erg | 5,000 nJ |
| 100 erg | 10,000 nJ |
| 500 erg | 50,000 nJ |
| 1,000 erg | 100,000 nJ |
Reverse conversion: Nanojoule to Erg
100 nJ × 0.01 = 1 erg
100 nanojoules = 1 ergs.
ergs = nanojoules × 0.01
For a page dedicated to this direction, see Nanojoule to Erg.
Understanding the Erg (erg)
An erg is a CGS energy unit.
Understanding the Nanojoule (nJ)
Nanojoule is 1e-9 joule units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many nanojoules are in 1 erg?
1 erg equals 100 nanojoules, using the exact defined conversion factor rather than an estimate.
How do I convert erg to nanojoule?
Multiply the erg value by 100. The converter above does this instantly to whatever precision you set.
How do I convert nanojoule back to erg?
Use the reverse factor: 1 nanojoule equals 0.01 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 nanojoule?
Nanojoule (nJ) is a unit of engineering.
Is the erg to nanojoule conversion exact?
Yes. Both erg and nanojoule are defined by fixed standards rather than physical artifacts, so the factor of 100 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.