An avoirdupois dram is 1/16 ounce.
Drams to Femtograms Converter — dr to fg
Convert Dram (dr) to Femtogram (fg) using the exact conversion factor (1 dram = 1.771845e+15 femtogram). See the formula, worked examples, and conversion table.
Drams 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 0.001771845195 / 1e-18.
Mass uses the kilogram as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Drams to Femtograms
Weight conversions between Dram 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: An avoirdupois dram is 1/16 ounce, and femtogram is 1e-15 gram units.
Formula
femtograms = drams × 1.771845e+15
This factor comes from each unit's defined relationship to the category's base unit: 1 dram equals 0.00177184519531 base units, and 1 femtogram equals 1e-18 base units, so dividing one by the other gives the direct dram-to-femtogram factor of 1.771845e+15.
Simple example
1 dr × 1.771845e+15 = 1.771845e+15 fg
1 dram = 1.771845e+15 femtograms.
Real-world example
50 dr × 1.771845e+15 = 8.859226e+16 fg
50 drams = 8.859226e+16 femtograms.
Conversion table
| Dram (dr) | Femtogram (fg) |
|---|---|
| 1 dr | 1.771845e+15 fg |
| 5 dr | 8.859226e+15 fg |
| 10 dr | 1.771845e+16 fg |
| 25 dr | 4.429613e+16 fg |
| 50 dr | 8.859226e+16 fg |
| 100 dr | 1.771845e+17 fg |
Reverse conversion: Femtogram to Dram
1.771845e+15 fg × 5.643834e-16 = 0.9999998898 dr
1.771845e+15 femtograms = 0.9999998898 drams.
drams = femtograms × 5.643834e-16
For a page dedicated to this direction, see Femtogram to Dram.
Understanding the Dram (dr)
An avoirdupois dram is 1/16 ounce.
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 dram?
1 dram equals 1.771845e+15 femtograms, using the exact defined conversion factor rather than an estimate.
How do I convert dram to femtogram?
Multiply the dram value by 1.771845e+15. The converter above does this instantly to whatever precision you set.
How do I convert femtogram back to dram?
Use the reverse factor: 1 femtogram equals 5.643834e-16 drams. You can also use the swap control in the converter above to flip the direction instantly.
What is a dram?
Dram (dr) is a unit of mass/weight.
What is a femtogram?
Femtogram (fg) is a unit of mass/weight.
Is the dram to femtogram conversion exact?
Yes. Both dram and femtogram are defined by fixed standards rather than physical artifacts, so the factor of 1.771845e+15 used above is exact to as many digits as you choose to display.