Rontogram is 1e-27 gram units.
Rontograms to Femtograms Converter — rg to fg
Convert Rontogram (rg) to Femtogram (fg) using the exact conversion factor (1 rontogram = 1e-12 femtogram). See the formula, worked examples, and conversion table.
Rontograms to Femtograms converter
Converter
Mass/Weight Converter
Convert SI mass, imperial weight, jewelry, atomic, and astronomy mass units.
Context values
Some unit families need one extra value for a physically accurate result.
Femtogram is 1e-15 gram units.
Result = input x 1e-30 / 1e-18.
Mass uses the kilogram as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Rontograms to Femtograms
Weight conversions between Rontogram and Femtogram come up constantly in everyday commerce, shipping, and cooking, since US packaging is usually labeled in pounds while most of the rest of the world uses kilograms. Specifically: Rontogram is 1e-27 gram units, and femtogram is 1e-15 gram units.
Formula
femtograms = rontograms × 1e-12
This factor comes from each unit's defined relationship to the category's base unit: 1 rontogram equals 1e-30 base units, and 1 femtogram equals 1e-18 base units, so dividing one by the other gives the direct rontogram-to-femtogram factor of 1e-12.
Simple example
1 rg × 1e-12 = 1e-12 fg
1 rontogram = 1e-12 femtograms.
Real-world example
50 rg × 1e-12 = 5e-11 fg
50 rontograms = 5e-11 femtograms.
Conversion table
| Rontogram (rg) | Femtogram (fg) |
|---|---|
| 1 rg | 1e-12 fg |
| 5 rg | 5e-12 fg |
| 10 rg | 1e-11 fg |
| 25 rg | 2.5e-11 fg |
| 50 rg | 5e-11 fg |
| 100 rg | 1e-10 fg |
Reverse conversion: Femtogram to Rontogram
1e-12 fg × 1e+12 = 1 rg
1e-12 femtograms = 1 rontogram.
rontograms = femtograms × 1e+12
For a page dedicated to this direction, see Femtogram to Rontogram.
Understanding the Rontogram (rg)
Rontogram is 1e-27 gram units.
Understanding the Femtogram (fg)
Femtogram is 1e-15 gram units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many femtograms are in 1 rontogram?
1 rontogram equals 1e-12 femtograms, using the exact defined conversion factor rather than an estimate.
How do I convert rontogram to femtogram?
Multiply the rontogram value by 1e-12. The converter above does this instantly to whatever precision you set.
How do I convert femtogram back to rontogram?
Use the reverse factor: 1 femtogram equals 1e+12 rontograms. You can also use the swap control in the converter above to flip the direction instantly.
What is a rontogram?
Rontogram (rg) is a unit of mass/weight.
What is a femtogram?
Femtogram (fg) is a unit of mass/weight.
Is the rontogram to femtogram conversion exact?
Yes. Both rontogram and femtogram are defined by fixed standards rather than physical artifacts, so the factor of 1e-12 used above is exact to as many digits as you choose to display.