Microgram is 0.000001 gram units.
Micrograms to Femtograms Converter — ug to fg
Convert Microgram (ug) to Femtogram (fg) using the exact conversion factor (1 microgram = 1,000,000,000 femtogram). See the formula, worked examples, and conversion table.
Micrograms 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-9 / 1e-18.
Mass uses the kilogram as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Micrograms to Femtograms
Weight conversions between Microgram 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: Microgram is 0.000001 gram units, and femtogram is 1e-15 gram units.
Formula
femtograms = micrograms × 1000000000
This factor comes from each unit's defined relationship to the category's base unit: 1 microgram equals 1e-9 base units, and 1 femtogram equals 1e-18 base units, so dividing one by the other gives the direct microgram-to-femtogram factor of 1000000000.
Simple example
1 ug × 1000000000 = 1,000,000,000 fg
1 microgram = 1,000,000,000 femtograms.
Real-world example
50 ug × 1000000000 = 50,000,000,000 fg
50 micrograms = 50,000,000,000 femtograms.
Conversion table
| Microgram (ug) | Femtogram (fg) |
|---|---|
| 1 ug | 1,000,000,000 fg |
| 5 ug | 5,000,000,000 fg |
| 10 ug | 10,000,000,000 fg |
| 25 ug | 25,000,000,000 fg |
| 50 ug | 50,000,000,000 fg |
| 100 ug | 100,000,000,000 fg |
Reverse conversion: Femtogram to Microgram
1 fg × 1e-9 = 1e-9 ug
1 femtogram = 1e-9 micrograms.
micrograms = femtograms × 1e-9
For a page dedicated to this direction, see Femtogram to Microgram.
Understanding the Microgram (ug)
Microgram is 0.000001 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 microgram?
1 microgram equals 1,000,000,000 femtograms, using the exact defined conversion factor rather than an estimate.
How do I convert microgram to femtogram?
Multiply the microgram value by 1000000000. The converter above does this instantly to whatever precision you set.
How do I convert femtogram back to microgram?
Use the reverse factor: 1 femtogram equals 1e-9 micrograms. You can also use the swap control in the converter above to flip the direction instantly.
What is a microgram?
Microgram (ug) is a unit of mass/weight.
What is a femtogram?
Femtogram (fg) is a unit of mass/weight.
Is the microgram to femtogram conversion exact?
Yes. Both microgram and femtogram are defined by fixed standards rather than physical artifacts, so the factor of 1000000000 used above is exact to as many digits as you choose to display.