Mass and Weight · Unit Converter

Convert Gram to Dram (apothecary/troy)

Convert grams to drams (apothecary/troy) instantly. 1 gram = 0.2572059725 dram (apothecary/troy) — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Dram (apothecary/troy) to Gram 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

Metric / SI

Gram

What is a gram?

The gram (g) equals one-thousandth of a kilogram.

Origin of the gram

From Late Latin 'gramma', a small weight or scruple.

Where it is used

The everyday metric unit for food, medicine, and small objects.

When and where it was developed

Defined in 1795 as the mass of one cubic centimeter of water at melting point.

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.

Gram to Dram (apothecary/troy) conversion formula

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

1 g = 0.2572059725 dr ap
1 dr ap = 3.8879346 g

To convert grams to drams (apothecary/troy), multiply the value in grams by 0.2572059725. To reverse, multiply drams (apothecary/troy) by 3.8879346.

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 Gram converter for the reverse direction.

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

  1. Write down the value in grams (g).
  2. Multiply that value by the factor 0.2572059725.
  3. The product is the equivalent value in drams (apothecary/troy) (dr ap).
  4. To reverse, multiply the dram (apothecary/troy) value by 3.8879346.

Worked examples

Example 1 — Convert 1 g to dr ap:
1 × 0.2572059725 = 0.2572059725 dr ap

Example 2 — Convert 100 g to dr ap:
100 × 0.2572059725 = 25.7205972549 dr ap

Real-world example — Postcard and small-object dimensions

A postcard is about 5 grams wide. Converting to drams (apothecary/troy) is essential for international postal addressing forms that ask for dimensions in different units across countries.

5 g × 0.2572059725 = 1.2860298627 dr ap

Real-world example — Ruler-scale measurements

A 30-gram school ruler converts cleanly to drams (apothecary/troy) — useful when buying a desk accessory from a retailer whose product specs use a different unit.

30 g × 0.2572059725 = 7.7161791765 dr ap

Real-world example — Hardware-scale dimensions

A 10-gram fastener or component is about as long as a thumbnail. Mechanics and DIY enthusiasts convert between grams and drams (apothecary/troy) daily when mixing metric and imperial tools.

10 g × 0.2572059725 = 2.5720597255 dr ap

Gram to Dram (apothecary/troy) conversion table

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

Gram [g]Dram (apothecary/troy) [dr ap]
0.010.0025720597
0.10.0257205973
10.2572059725
20.5144119451
30.7716179176
41.0288238902
51.2860298627
102.5720597255
205.144119451
307.7161791765
4010.288238902
5012.8602986275
10025.7205972549
500128.6029862745
1000257.205972549

Frequently asked questions

How many drams (apothecary/troy) is 1 gram?
1 gram equals 0.2572059725 dram (apothecary/troy).
How do I convert grams to drams (apothecary/troy)?
Multiply the value in grams by 0.2572059725 to get drams (apothecary/troy).
How do I convert drams (apothecary/troy) back to grams?
Multiply the value in drams (apothecary/troy) by 3.8879346, or use the Dram (apothecary/troy) to Gram converter.
How many drams (apothecary/troy) is 100 grams?
100 grams equals 25.7205972549 drams (apothecary/troy), because 100 × 0.2572059725 = 25.7205972549.

Convert Gram to other weight units

Show all Gram conversions
Metric / SI (17 units)
Gram to Attogram (ag) Gram to Femtogram (fg) Gram to Picogram (pg) Gram to Nanogram (ng) Gram to Microgram (µg) Gram to Milligram (mg) Gram to Centigram (cg) Gram to Decigram (dg) Gram to Dekagram (dag) Gram to Hectogram (hg) Gram to Kilogram (kg) Gram to Quintal (metric) (q) Gram to Metric Ton (t) Gram to Gigagram (Gg) Gram to Teragram (Tg) Gram to Petagram (Pg) Gram to Exagram (Eg)
Avoirdupois (15 units)
Gram to Grain (gr) Gram to Dram (avoirdupois) (dr) Gram to Ounce (oz) Gram to Pound (lb) Gram to Clove (clove) Gram to Stone (US) (st) Gram to Stone (UK) (st) Gram to Quarter (US) (qr) Gram to Quarter (UK) (qr) Gram to Hundredweight (US) (cwt) Gram to Hundredweight (UK) (cwt) Gram to Wey (wey) Gram to Kilopound (kip) (kip) Gram to Ton (short, US) (sh tn) Gram to Ton (long, UK) (long tn)
Troy & Apothecary (10 units)
Gram to Point (1/100 carat) (pt) Gram to Carat (metric) (ct) Gram to Scruple (apothecary) (s ap) Gram to Pennyweight (dwt) Gram to Momme (mom) Gram to Mace (mace) Gram to Dram (apothecary/troy) (dr ap) Gram to Troy Ounce (oz t) Gram to Tael (tael) Gram to Pound (troy/apothecary) (lb t)
Indian / South Asian (6 units)
Gram to Ratti (ratti) Gram to Masha (masha) Gram to Tola (tola) Gram to Chittack (Chatank) (chittack) Gram to Seer (Ser) (seer) Gram to Maund (Mann) (maund)
Scientific / Atomic (9 units)
Gram to Electron Mass (rest) (me) Gram to MeV/c2 (MeV/c²) Gram to Muon Mass (mµ) Gram to Atomic Mass Unit (u) Gram to Proton Mass (mp) Gram to Neutron Mass (mn) Gram to Deuteron Mass (md) Gram to Carbon-12 Atom Mass (C-12) Gram to Planck Mass (mP)
Astronomical (4 units)
Gram to Lunar Mass (Moon) (M☾) Gram to Earth's Mass (M⊕) Gram to Jupiter Mass (MJ) Gram to Sun's Mass (M☉)
Biblical / Ancient (14 units)
Gram to Lepton (Biblical Roman) (lepton) Gram to Quadrans (Biblical Roman) (quadrans) Gram to Assarion (Biblical Roman) (assarion) Gram to Gerah (Biblical Hebrew) (gerah) Gram to Drachma (Biblical Greek) (drachma) Gram to Denarius (Biblical Roman) (denarius) Gram to Bekan (Biblical Hebrew) (bekah) Gram to Didrachma (Biblical Greek) (didrachma) Gram to Shekel (Biblical Hebrew) (shekel) Gram to Tetradrachma (Biblical Greek) (tetra) Gram to Mina (Biblical Greek) (mina) Gram to Mina (Biblical Hebrew) (mina) Gram to Talent (Biblical Greek) (talent) Gram to Talent (Biblical Hebrew) (talent)
Force / Engineering (5 units)
Gram to Poundal (pdl) Gram to Ton (assay) (US) (AT) Gram to Ton (assay) (UK) (AT) Gram to Kilogram-force square second/meter (hyl) Gram to Slug (slug)

Sources & references

Conversion factor (1 g = 0.2572059725 dr ap) verified against the following authoritative sources:

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