Mass and Weight · Unit Converter

Convert Grain to Dram (apothecary/troy)

Convert grains to drams (apothecary/troy) instantly. 1 grain = 0.0166666641 dram (apothecary/troy) — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Dram (apothecary/troy) to Grain 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

Grain

What is a grain?

The grain (gr) equals 1/7000 of an avoirdupois pound, about 64.8 milligrams.

Origin of the grain

Based on the nominal mass of a single barley grain.

Where it is used

Ammunition and bullet mass, archery, and historical pharmacy.

When and where it was developed

Standardized through the English avoirdupois system and retained in 1959.

Troy & Apothecary

Dram (apothecary/troy)

What is a dram (apothecary/troy)?

The apothecary (troy) dram equals one-eighth of a troy ounce, about 3.888 grams.

Origin of the dram (apothecary/troy)

From the apothecaries' system rooted in the Greek 'drachma'.

Where it is used

Historical pharmacy and medicine compounding.

When and where it was developed

Part of the apothecaries' system of weights used through the 19th century.

Grain to Dram (apothecary/troy) conversion formula

The relationship between grains and drams (apothecary/troy):

1 gr = 0.0166666641 dr ap
1 dr ap = 60.0000092594 gr

To convert grains to drams (apothecary/troy), multiply the value in grains by 0.0166666641. To reverse, multiply drams (apothecary/troy) by 60.0000092594.

How to use this converter

Type a value into the calculator. The result in drams (apothecary/troy) 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 (apothecary/troy) to Grain converter for the reverse direction.

Step-by-step: convert grains to drams (apothecary/troy)

  1. Write down the value in grains (gr).
  2. Multiply that value by the factor 0.0166666641.
  3. The product is the equivalent value in drams (apothecary/troy) (dr ap).
  4. To reverse, multiply the dram (apothecary/troy) value by 60.0000092594.

Worked examples

Example 1 — Convert 1 gr to dr ap:
1 × 0.0166666641 = 0.0166666641 dr ap

Example 2 — Convert 100 gr to dr ap:
100 × 0.0166666641 = 1.6666664095 dr ap

Real-world example — Packaging gauge

A 4-grain plastic bag thickness is a common spec for grocery and freezer bags. Converting from grains to drams (apothecary/troy) is what packaging buyers do whenever they bridge US and metric supplier quotes.

4 gr × 0.0166666641 = 0.0666666564 dr ap

Real-world example — Plastic film and laminate thickness

A 500-grain sheet is a typical spec for ID-card laminates and film overlays. Converting to drams (apothecary/troy) aligns the value with the unit most CAD systems and material datasheets prefer.

500 gr × 0.0166666641 = 8.3333320473 dr ap

Grain to Dram (apothecary/troy) conversion table

Standard reference values for converting grains to drams (apothecary/troy):

Grain [gr]Dram (apothecary/troy) [dr ap]
0.010.0001666666
0.10.0016666664
10.0166666641
20.0333333282
30.0499999923
40.0666666564
50.0833333205
100.1666666409
200.3333332819
300.4999999228
400.6666665638
500.8333332047
1001.6666664095
5008.3333320473
100016.6666640946

Frequently asked questions

How many drams (apothecary/troy) is 1 grain?
1 grain equals 0.0166666641 dram (apothecary/troy).
How do I convert grains to drams (apothecary/troy)?
Multiply the value in grains by 0.0166666641 to get drams (apothecary/troy).
How do I convert drams (apothecary/troy) back to grains?
Multiply the value in drams (apothecary/troy) by 60.0000092594, or use the Dram (apothecary/troy) to Grain converter.
How many drams (apothecary/troy) is 100 grains?
100 grains equals 1.6666664095 drams (apothecary/troy), because 100 × 0.0166666641 = 1.6666664095.

Convert Grain to other weight units

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

Sources & references

Conversion factor (1 gr = 0.0166666641 dr ap) verified against the following authoritative sources:

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