Convert Femtogram to Dram (avoirdupois)
Convert femtograms to drams (avoirdupois) instantly. 1 femtogram = 5.643834e-16 dram (avoirdupois) — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Dram (avoirdupois) to Femtogram converter for the reverse conversion.
Units explained
Femtogram
A femtogram (fg) equals 10^-18 kilogram.
From the SI prefix 'femto-' (from Danish/Norwegian 'femten', fifteen).
Nanotechnology and high-sensitivity mass spectrometry.
The femto- prefix was adopted by the CGPM in 1975.
Dram (avoirdupois)
The avoirdupois dram (dr) equals one-sixteenth of an ounce, about 1.77 grams.
From Greek 'drachma' through Latin 'dragma'.
Historically pharmacy; today occasional cooking and firearms (powder) use.
Defined as 1/256 of the avoirdupois pound.
Femtogram to Dram (avoirdupois) conversion formula
The relationship between femtograms and drams (avoirdupois):
To convert femtograms to drams (avoirdupois), multiply the value in femtograms by 5.643834e-16. To reverse, multiply drams (avoirdupois) by 1.771845e+15.
How to use this converter
Type a value into the calculator. The result in drams (avoirdupois) updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Dram (avoirdupois) to Femtogram converter for the reverse direction.
Step-by-step: convert femtograms to drams (avoirdupois)
- Write down the value in femtograms (fg).
- Multiply that value by the factor 5.643834e-16.
- The product is the equivalent value in drams (avoirdupois) (dr).
- To reverse, multiply the dram (avoirdupois) value by 1.771845e+15.
Worked examples
Example 1 — Convert 1 fg to dr:
1 × 5.643834e-16 = 5.643834e-16 dr
Example 2 — Convert 100 fg to dr:
100 × 5.643834e-16 = 5.643834e-14 dr
Real-world example — Sub-micron to millimeter
500,000 femtograms converts to a small everyday quantity in drams (avoirdupois) — useful when relating optical-wavelength specifications to physical mounting hardware.
500000 fg × 5.643834e-16 = 2.821917e-10 dr
Real-world example — From wavelengths to millimeter-scale objects
A value of one million femtograms sounds vast at the atomic scale but converts to a small everyday quantity in drams (avoirdupois) — useful when relating optical-wavelength specifications to physical mounting hardware.
1000000 fg × 5.643834e-16 = 5.643834e-10 dr
Femtogram to Dram (avoirdupois) conversion table
Standard reference values for converting femtograms to drams (avoirdupois):
| Femtogram [fg] | Dram (avoirdupois) [dr] |
|---|---|
| 0.01 | 5.643834e-18 |
| 0.1 | 5.643834e-17 |
| 1 | 5.643834e-16 |
| 2 | 1.128767e-15 |
| 3 | 1.69315e-15 |
| 4 | 2.257534e-15 |
| 5 | 2.821917e-15 |
| 10 | 5.643834e-15 |
| 20 | 1.128767e-14 |
| 30 | 1.69315e-14 |
| 40 | 2.257534e-14 |
| 50 | 2.821917e-14 |
| 100 | 5.643834e-14 |
| 500 | 2.821917e-13 |
| 1000 | 5.643834e-13 |
Frequently asked questions
How many drams (avoirdupois) is 1 femtogram?
How do I convert femtograms to drams (avoirdupois)?
How do I convert drams (avoirdupois) back to femtograms?
How many drams (avoirdupois) is 100 femtograms?
Popular weight unit conversions
Convert Femtogram to other weight units
Show all Femtogram conversions
Metric / SI (17 units)
Avoirdupois (15 units)
Troy & Apothecary (10 units)
Indian / South Asian (6 units)
Scientific / Atomic (9 units)
Astronomical (4 units)
Biblical / Ancient (14 units)
Sources & references
Conversion factor (1 fg = 5.643834e-16 dr) verified against the following authoritative sources:
- BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
- NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
- NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
- NIST — Refinement of values for the yard and pound (Federal Register 1959)
The treaty (signed by US
- International Astronomical Union — System of Astronomical Constants
The IAU defines astronomical units including the AU (149597870700 m exactly) light-year and parsec used in astronomy and astrophysics.