An erg is a CGS energy unit.
Ergs to Rontojoules Converter — erg to rJ
Convert Erg (erg) to Rontojoule (rJ) using the exact conversion factor (1 erg = 1e+20 rontojoule). See the formula, worked examples, and conversion table.
Ergs to Rontojoules converter
Converter
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Context values
Some unit families need one extra value for a physically accurate result.
Rontojoule is 1e-27 joule units.
Result = input x 1e-7 / 1e-27.
Energy uses the joule as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Ergs to Rontojoules
Erg and Rontojoule both measure energy, and the conversion is especially useful for comparing nutrition labels (kilocalories) against scientific energy figures (joules). Specifically: An erg is a CGS energy unit, and rontojoule is 1e-27 joule units.
Formula
rontojoules = ergs × 1e+20
This factor comes from each unit's defined relationship to the category's base unit: 1 erg equals 1e-7 base units, and 1 rontojoule equals 1e-27 base units, so dividing one by the other gives the direct erg-to-rontojoule factor of 1e+20.
Simple example
1 erg × 1e+20 = 1e+20 rJ
1 erg = 1e+20 rontojoules.
Real-world example
100 erg × 1e+20 = 1e+22 rJ
100 ergs = 1e+22 rontojoules.
Conversion table
| Erg (erg) | Rontojoule (rJ) |
|---|---|
| 1 erg | 1e+20 rJ |
| 10 erg | 1e+21 rJ |
| 100 erg | 1e+22 rJ |
| 500 erg | 5e+22 rJ |
| 1,000 erg | 1e+23 rJ |
| 2,000 erg | 2e+23 rJ |
Reverse conversion: Rontojoule to Erg
1e+20 rJ × 1e-20 = 1 erg
1e+20 rontojoules = 1 ergs.
ergs = rontojoules × 1e-20
For a page dedicated to this direction, see Rontojoule to Erg.
Understanding the Erg (erg)
An erg is a CGS energy unit.
Understanding the Rontojoule (rJ)
Rontojoule is 1e-27 joule units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many rontojoules are in 1 erg?
1 erg equals 1e+20 rontojoules, using the exact defined conversion factor rather than an estimate.
How do I convert erg to rontojoule?
Multiply the erg value by 1e+20. The converter above does this instantly to whatever precision you set.
How do I convert rontojoule back to erg?
Use the reverse factor: 1 rontojoule equals 1e-20 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 energy.
What is a rontojoule?
Rontojoule (rJ) is a unit of energy.
Is the erg to rontojoule conversion exact?
Yes. Both erg and rontojoule are defined by fixed standards rather than physical artifacts, so the factor of 1e+20 used above is exact to as many digits as you choose to display.