Mass and Weight · Unit Converter

Convert Milligram to Dram (apothecary/troy)

Convert milligrams to drams (apothecary/troy) instantly. 1 milligram = 0.000257206 dram (apothecary/troy) — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Dram (apothecary/troy) to Milligram 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

Milligram

What is a milligram?

A milligram (mg) equals one-millionth of a kilogram, or 0.001 gram.

Origin of the milligram

From the SI prefix 'milli-' (from Latin 'mille', thousand).

Where it is used

Standard for medicine dosing, nutrition labels, and fine jewelry.

When and where it was developed

Part of the original metric system of 1795.

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.

Milligram to Dram (apothecary/troy) conversion formula

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

1 mg = 0.000257206 dr ap
1 dr ap = 3887.9346 mg

To convert milligrams to drams (apothecary/troy), multiply the value in milligrams by 0.000257206. To reverse, multiply drams (apothecary/troy) by 3887.9346.

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 Milligram converter for the reverse direction.

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

  1. Write down the value in milligrams (mg).
  2. Multiply that value by the factor 0.000257206.
  3. The product is the equivalent value in drams (apothecary/troy) (dr ap).
  4. To reverse, multiply the dram (apothecary/troy) value by 3887.9346.

Worked examples

Example 1 — Convert 1 mg to dr ap:
1 × 0.000257206 = 0.000257206 dr ap

Example 2 — Convert 100 mg to dr ap:
100 × 0.000257206 = 0.0257205973 dr ap

Real-world example — Packaging gauge

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

4 mg × 0.000257206 = 0.0010288239 dr ap

Real-world example — Plastic film and laminate thickness

A 500-milligram 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 mg × 0.000257206 = 0.1286029863 dr ap

Milligram to Dram (apothecary/troy) conversion table

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

Milligram [mg]Dram (apothecary/troy) [dr ap]
0.012.57206e-6
0.12.57206e-5
10.000257206
20.0005144119
30.0007716179
40.0010288239
50.0012860299
100.0025720597
200.0051441195
300.0077161792
400.0102882389
500.0128602986
1000.0257205973
5000.1286029863
10000.2572059725

Frequently asked questions

How many drams (apothecary/troy) is 1 milligram?
1 milligram equals 0.000257206 dram (apothecary/troy).
How do I convert milligrams to drams (apothecary/troy)?
Multiply the value in milligrams by 0.000257206 to get drams (apothecary/troy).
How do I convert drams (apothecary/troy) back to milligrams?
Multiply the value in drams (apothecary/troy) by 3887.9346, or use the Dram (apothecary/troy) to Milligram converter.
How many drams (apothecary/troy) is 100 milligrams?
100 milligrams equals 0.0257205973 drams (apothecary/troy), because 100 × 0.000257206 = 0.0257205973.

Convert Milligram to other weight units

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

Sources & references

Conversion factor (1 mg = 0.000257206 dr ap) verified against the following authoritative sources:

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