Ronnajoule is 1e+27 joule units.
Ronnajoules to Femtojoules Converter — RJ to fJ
Convert Ronnajoule (RJ) to Femtojoule (fJ) using the exact conversion factor (1 ronnajoule = 1e+42 femtojoule). See the formula, worked examples, and conversion table.
Ronnajoules to Femtojoules 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.
Femtojoule is 1e-15 joule units.
Result = input x 1e+27 / 1e-15.
Energy uses the joule as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Ronnajoules to Femtojoules
Ronnajoule and Femtojoule both measure energy, and the conversion is especially useful for comparing nutrition labels (kilocalories) against scientific energy figures (joules). Specifically: Ronnajoule is 1e+27 joule units, and femtojoule is 1e-15 joule units.
Formula
femtojoules = ronnajoules × 1e+42
This factor comes from each unit's defined relationship to the category's base unit: 1 ronnajoule equals 1e+27 base units, and 1 femtojoule equals 1e-15 base units, so dividing one by the other gives the direct ronnajoule-to-femtojoule factor of 1e+42.
Simple example
1 RJ × 1e+42 = 1e+42 fJ
1 ronnajoule = 1e+42 femtojoules.
Real-world example
100 RJ × 1e+42 = 1e+44 fJ
100 ronnajoules = 1e+44 femtojoules.
Conversion table
| Ronnajoule (RJ) | Femtojoule (fJ) |
|---|---|
| 1 RJ | 1e+42 fJ |
| 10 RJ | 1e+43 fJ |
| 100 RJ | 1e+44 fJ |
| 500 RJ | 5e+44 fJ |
| 1,000 RJ | 1e+45 fJ |
| 2,000 RJ | 2e+45 fJ |
Reverse conversion: Femtojoule to Ronnajoule
1e+42 fJ × 1e-42 = 1 RJ
1e+42 femtojoules = 1 ronnajoules.
ronnajoules = femtojoules × 1e-42
For a page dedicated to this direction, see Femtojoule to Ronnajoule.
Understanding the Ronnajoule (RJ)
Ronnajoule is 1e+27 joule units.
Understanding the Femtojoule (fJ)
Femtojoule is 1e-15 joule units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many femtojoules are in 1 ronnajoule?
1 ronnajoule equals 1e+42 femtojoules, using the exact defined conversion factor rather than an estimate.
How do I convert ronnajoule to femtojoule?
Multiply the ronnajoule value by 1e+42. The converter above does this instantly to whatever precision you set.
How do I convert femtojoule back to ronnajoule?
Use the reverse factor: 1 femtojoule equals 1e-42 ronnajoules. You can also use the swap control in the converter above to flip the direction instantly.
What is a ronnajoule?
Ronnajoule (RJ) is a unit of energy.
What is a femtojoule?
Femtojoule (fJ) is a unit of energy.
Is the ronnajoule to femtojoule conversion exact?
Yes. Both ronnajoule and femtojoule are defined by fixed standards rather than physical artifacts, so the factor of 1e+42 used above is exact to as many digits as you choose to display.