Femtojoule is 1e-15 joule units.
Femtojoules to Ergs Converter — fJ to erg
Convert Femtojoule (fJ) to Erg (erg) using the exact conversion factor (1 femtojoule = 1e-8 erg). See the formula, worked examples, and conversion table.
Femtojoules to Ergs converter
Converter
Energy Converter
Convert joules, calories, kilowatt-hours, BTU, electronvolts, therms, and mechanical work units.
Context values
Some unit families need one extra value for a physically accurate result.
An erg is a CGS energy unit.
Result = input x 1e-15 / 1e-7.
Energy uses the joule as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Femtojoules to Ergs
Femtojoule and Erg both measure energy, and the conversion is especially useful for comparing nutrition labels (kilocalories) against scientific energy figures (joules). Specifically: Femtojoule is 1e-15 joule units, and an erg is a CGS energy unit.
Formula
ergs = femtojoules × 1e-8
This factor comes from each unit's defined relationship to the category's base unit: 1 femtojoule equals 1e-15 base units, and 1 erg equals 1e-7 base units, so dividing one by the other gives the direct femtojoule-to-erg factor of 1e-8.
Simple example
1 fJ × 1e-8 = 1e-8 erg
1 femtojoule = 1e-8 ergs.
Real-world example
100 fJ × 1e-8 = 0.000001 erg
100 femtojoules = 0.000001 ergs.
Conversion table
| Femtojoule (fJ) | Erg (erg) |
|---|---|
| 1 fJ | 1e-8 erg |
| 10 fJ | 1e-7 erg |
| 100 fJ | 0.000001 erg |
| 500 fJ | 0.000005 erg |
| 1,000 fJ | 0.00001 erg |
| 2,000 fJ | 0.00002 erg |
Reverse conversion: Erg to Femtojoule
1e-8 erg × 100000000 = 1 fJ
1e-8 ergs = 1 femtojoules.
femtojoules = ergs × 100000000
For a page dedicated to this direction, see Erg to Femtojoule.
Understanding the Femtojoule (fJ)
Femtojoule is 1e-15 joule units.
Understanding the Erg (erg)
An erg is a CGS energy unit.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many ergs are in 1 femtojoule?
1 femtojoule equals 1e-8 ergs, using the exact defined conversion factor rather than an estimate.
How do I convert femtojoule to erg?
Multiply the femtojoule value by 1e-8. The converter above does this instantly to whatever precision you set.
How do I convert erg back to femtojoule?
Use the reverse factor: 1 erg equals 100,000,000 femtojoules. You can also use the swap control in the converter above to flip the direction instantly.
What is a femtojoule?
Femtojoule (fJ) is a unit of energy.
What is a erg?
Erg (erg) is a unit of energy.
Is the femtojoule to erg conversion exact?
Yes. Both femtojoule and erg are defined by fixed standards rather than physical artifacts, so the factor of 1e-8 used above is exact to as many digits as you choose to display.