Rontogram is 1e-27 gram units.
Rontograms to Micrograms Converter — rg to ug
Convert Rontogram (rg) to Microgram (ug) using the exact conversion factor (1 rontogram = 1e-21 microgram). See the formula, worked examples, and conversion table.
Rontograms to Micrograms 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.
Microgram is 0.000001 gram units.
Result = input x 1e-30 / 1e-9.
Mass uses the kilogram as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Rontograms to Micrograms
Weight conversions between Rontogram and Microgram 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 microgram is 0.000001 gram units.
Formula
micrograms = rontograms × 1e-21
This factor comes from each unit's defined relationship to the category's base unit: 1 rontogram equals 1e-30 base units, and 1 microgram equals 1e-9 base units, so dividing one by the other gives the direct rontogram-to-microgram factor of 1e-21.
Simple example
1 rg × 1e-21 = 1e-21 ug
1 rontogram = 1e-21 micrograms.
Real-world example
50 rg × 1e-21 = 5e-20 ug
50 rontograms = 5e-20 micrograms.
Conversion table
| Rontogram (rg) | Microgram (ug) |
|---|---|
| 1 rg | 1e-21 ug |
| 5 rg | 5e-21 ug |
| 10 rg | 1e-20 ug |
| 25 rg | 2.5e-20 ug |
| 50 rg | 5e-20 ug |
| 100 rg | 1e-19 ug |
Reverse conversion: Microgram to Rontogram
1e-21 ug × 1e+21 = 1 rg
1e-21 micrograms = 1 rontograms.
rontograms = micrograms × 1e+21
For a page dedicated to this direction, see Microgram to Rontogram.
Understanding the Rontogram (rg)
Rontogram is 1e-27 gram units.
Understanding the Microgram (ug)
Microgram is 0.000001 gram units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many micrograms are in 1 rontogram?
1 rontogram equals 1e-21 micrograms, using the exact defined conversion factor rather than an estimate.
How do I convert rontogram to microgram?
Multiply the rontogram value by 1e-21. The converter above does this instantly to whatever precision you set.
How do I convert microgram back to rontogram?
Use the reverse factor: 1 microgram equals 1e+21 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 microgram?
Microgram (ug) is a unit of mass/weight.
Is the rontogram to microgram conversion exact?
Yes. Both rontogram and microgram are defined by fixed standards rather than physical artifacts, so the factor of 1e-21 used above is exact to as many digits as you choose to display.