Mass and Weight · Unit Converter

Convert Dram (avoirdupois) to Femtogram

Convert drams (avoirdupois) to femtograms instantly. 1 dram (avoirdupois) = 1.771845e+15 femtogram — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Femtogram to Dram (avoirdupois) converter for the reverse conversion.

Written by Sunith Babu L, Ph.D., Lead Engineer Reviewed by Dr. Ashok Kumar K, Ph.D.
Mass and Weight category 2 min read Published Last reviewed Updated

Units explained

Avoirdupois

Dram (avoirdupois)

What is a dram (avoirdupois)?

The avoirdupois dram (dr) equals one-sixteenth of an ounce, about 1.77 grams.

Origin of the dram (avoirdupois)

From Greek 'drachma' through Latin 'dragma'.

Where it is used

Historically pharmacy; today occasional cooking and firearms (powder) use.

When and where it was developed

Defined as 1/256 of the avoirdupois pound.

Metric / SI

Femtogram

What is a femtogram?

A femtogram (fg) equals 10^-18 kilogram.

Origin of the femtogram

From the SI prefix 'femto-' (from Danish/Norwegian 'femten', fifteen).

Where it is used

Nanotechnology and high-sensitivity mass spectrometry.

When and where it was developed

The femto- prefix was adopted by the CGPM in 1975.

Dram (avoirdupois) to Femtogram conversion formula

The relationship between drams (avoirdupois) and femtograms:

1 dr = 1.771845e+15 fg
1 fg = 5.643834e-16 dr

To convert drams (avoirdupois) to femtograms, multiply the value in drams (avoirdupois) by 1.771845e+15. To reverse, multiply femtograms by 5.643834e-16.

How to use this converter

Type a value into the calculator. The result in femtograms updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Femtogram to Dram (avoirdupois) converter for the reverse direction.

Step-by-step: convert drams (avoirdupois) to femtograms

  1. Write down the value in drams (avoirdupois) (dr).
  2. Multiply that value by the factor 1.771845e+15.
  3. The product is the equivalent value in femtograms (fg).
  4. To reverse, multiply the femtogram value by 5.643834e-16.

Worked examples

Example 1 — Convert 1 dr to fg:
1 × 1.771845e+15 = 1.771845e+15 fg

Example 2 — Convert 100 dr to fg:
100 × 1.771845e+15 = 1.771845e+17 fg

Real-world example — Centimeter to wavelength scale

One dram (avoirdupois) equals 10 million femtograms. Physics curricula use this kind of conversion to relate everyday measurements to atomic and optical scales.

1 dr × 1.771845e+15 = 1.771845e+15 fg

Real-world example — Small-scale to atomic-scale

One dram (avoirdupois) equals 10 million femtograms — useful for physics curricula that relate everyday measurements to atomic and optical scales.

1 dr × 1.771845e+15 = 1.771845e+15 fg

Dram (avoirdupois) to Femtogram conversion table

Standard reference values for converting drams (avoirdupois) to femtograms:

Dram (avoirdupois) [dr]Femtogram [fg]
0.011.771845e+13
0.11.771845e+14
11.771845e+15
23.54369e+15
35.315536e+15
47.087381e+15
58.859226e+15
101.771845e+16
203.54369e+16
305.315536e+16
407.087381e+16
508.859226e+16
1001.771845e+17
5008.859226e+17
10001.771845e+18

Frequently asked questions

How many femtograms is 1 dram (avoirdupois)?
1 dram (avoirdupois) equals 1.771845e+15 femtogram.
How do I convert drams (avoirdupois) to femtograms?
Multiply the value in drams (avoirdupois) by 1.771845e+15 to get femtograms.
How do I convert femtograms back to drams (avoirdupois)?
Multiply the value in femtograms by 5.643834e-16, or use the Femtogram to Dram (avoirdupois) converter.
How many femtograms is 100 drams (avoirdupois)?
100 drams (avoirdupois) equals 1.771845e+17 femtograms, because 100 × 1.771845e+15 = 1.771845e+17.

Convert Dram (avoirdupois) to other weight units

Show all Dram (avoirdupois) conversions
Metric / SI (18 units)
Dram (avoirdupois) to Attogram (ag) Dram (avoirdupois) to Femtogram (fg) Dram (avoirdupois) to Picogram (pg) Dram (avoirdupois) to Nanogram (ng) Dram (avoirdupois) to Microgram (µg) Dram (avoirdupois) to Milligram (mg) Dram (avoirdupois) to Centigram (cg) Dram (avoirdupois) to Decigram (dg) Dram (avoirdupois) to Gram (g) Dram (avoirdupois) to Dekagram (dag) Dram (avoirdupois) to Hectogram (hg) Dram (avoirdupois) to Kilogram (kg) Dram (avoirdupois) to Quintal (metric) (q) Dram (avoirdupois) to Metric Ton (t) Dram (avoirdupois) to Gigagram (Gg) Dram (avoirdupois) to Teragram (Tg) Dram (avoirdupois) to Petagram (Pg) Dram (avoirdupois) to Exagram (Eg)
Avoirdupois (14 units)
Dram (avoirdupois) to Grain (gr) Dram (avoirdupois) to Ounce (oz) Dram (avoirdupois) to Pound (lb) Dram (avoirdupois) to Clove (clove) Dram (avoirdupois) to Stone (US) (st) Dram (avoirdupois) to Stone (UK) (st) Dram (avoirdupois) to Quarter (US) (qr) Dram (avoirdupois) to Quarter (UK) (qr) Dram (avoirdupois) to Hundredweight (US) (cwt) Dram (avoirdupois) to Hundredweight (UK) (cwt) Dram (avoirdupois) to Wey (wey) Dram (avoirdupois) to Kilopound (kip) (kip) Dram (avoirdupois) to Ton (short, US) (sh tn) Dram (avoirdupois) to Ton (long, UK) (long tn)
Troy & Apothecary (10 units)
Dram (avoirdupois) to Point (1/100 carat) (pt) Dram (avoirdupois) to Carat (metric) (ct) Dram (avoirdupois) to Scruple (apothecary) (s ap) Dram (avoirdupois) to Pennyweight (dwt) Dram (avoirdupois) to Momme (mom) Dram (avoirdupois) to Mace (mace) Dram (avoirdupois) to Dram (apothecary/troy) (dr ap) Dram (avoirdupois) to Troy Ounce (oz t) Dram (avoirdupois) to Tael (tael) Dram (avoirdupois) to Pound (troy/apothecary) (lb t)
Indian / South Asian (6 units)
Dram (avoirdupois) to Ratti (ratti) Dram (avoirdupois) to Masha (masha) Dram (avoirdupois) to Tola (tola) Dram (avoirdupois) to Chittack (Chatank) (chittack) Dram (avoirdupois) to Seer (Ser) (seer) Dram (avoirdupois) to Maund (Mann) (maund)
Scientific / Atomic (9 units)
Dram (avoirdupois) to Electron Mass (rest) (me) Dram (avoirdupois) to MeV/c2 (MeV/c²) Dram (avoirdupois) to Muon Mass (mµ) Dram (avoirdupois) to Atomic Mass Unit (u) Dram (avoirdupois) to Proton Mass (mp) Dram (avoirdupois) to Neutron Mass (mn) Dram (avoirdupois) to Deuteron Mass (md) Dram (avoirdupois) to Carbon-12 Atom Mass (C-12) Dram (avoirdupois) to Planck Mass (mP)
Astronomical (4 units)
Dram (avoirdupois) to Lunar Mass (Moon) (M☾) Dram (avoirdupois) to Earth's Mass (M⊕) Dram (avoirdupois) to Jupiter Mass (MJ) Dram (avoirdupois) to Sun's Mass (M☉)
Biblical / Ancient (14 units)
Dram (avoirdupois) to Lepton (Biblical Roman) (lepton) Dram (avoirdupois) to Quadrans (Biblical Roman) (quadrans) Dram (avoirdupois) to Assarion (Biblical Roman) (assarion) Dram (avoirdupois) to Gerah (Biblical Hebrew) (gerah) Dram (avoirdupois) to Drachma (Biblical Greek) (drachma) Dram (avoirdupois) to Denarius (Biblical Roman) (denarius) Dram (avoirdupois) to Bekan (Biblical Hebrew) (bekah) Dram (avoirdupois) to Didrachma (Biblical Greek) (didrachma) Dram (avoirdupois) to Shekel (Biblical Hebrew) (shekel) Dram (avoirdupois) to Tetradrachma (Biblical Greek) (tetra) Dram (avoirdupois) to Mina (Biblical Greek) (mina) Dram (avoirdupois) to Mina (Biblical Hebrew) (mina) Dram (avoirdupois) to Talent (Biblical Greek) (talent) Dram (avoirdupois) to Talent (Biblical Hebrew) (talent)
Force / Engineering (5 units)
Dram (avoirdupois) to Poundal (pdl) Dram (avoirdupois) to Ton (assay) (US) (AT) Dram (avoirdupois) to Ton (assay) (UK) (AT) Dram (avoirdupois) to Kilogram-force square second/meter (hyl) Dram (avoirdupois) to Slug (slug)

Sources & references

Conversion factor (1 dr = 1.771845e+15 fg) verified against the following authoritative sources:

Results are provided for general reference. Verify critical measurements against an authoritative standard.