Mass and Weight · Unit Converter

Convert Dram (apothecary/troy) to Wey

Convert drams (apothecary/troy) to weys instantly. 1 dram (apothecary/troy) = 3.401361e-5 wey — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Wey to Dram (apothecary/troy) 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

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.

Avoirdupois

Wey

What is a wey?

The wey was an English bulk weight, here taken as 252 pounds (about 114.3 kg).

Origin of the wey

From Old English 'waege', a weighing or balance.

Where it is used

Obsolete English unit for wool, cheese, and salt.

When and where it was developed

Used in medieval and early-modern English trade.

Dram (apothecary/troy) to Wey conversion formula

Note: this conversion uses a generally accepted modern value. Historical and regional definitions of this unit varied across times and places.

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

1 dr ap = 3.401361e-5 wey
1 wey = 29400 dr ap

To convert drams (apothecary/troy) to weys, multiply the value in drams (apothecary/troy) by 3.401361e-5. To reverse, multiply weys by 29400.

How to use this converter

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

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

  1. Write down the value in drams (apothecary/troy) (dr ap).
  2. Multiply that value by the factor 3.401361e-5.
  3. The product is the equivalent value in weys (wey).
  4. To reverse, multiply the wey value by 29400.

Worked examples

Example 1 — Convert 1 dr ap to wey:
1 × 3.401361e-5 = 3.401361e-5 wey

Example 2 — Convert 100 dr ap to wey:
100 × 3.401361e-5 = 0.0034013605 wey

Real-world example — Ruler-scale measurements

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

30 dr ap × 3.401361e-5 = 0.0010204082 wey

Real-world example — Hardware-scale dimensions

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

10 dr ap × 3.401361e-5 = 0.0003401361 wey

Real-world example — Postcard and small-object dimensions

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

5 dr ap × 3.401361e-5 = 0.000170068 wey

Dram (apothecary/troy) to Wey conversion table

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

Dram (apothecary/troy) [dr ap]Wey [wey]
0.013.401361e-7
0.13.401361e-6
13.401361e-5
26.802721e-5
30.0001020408
40.0001360544
50.000170068
100.0003401361
200.0006802721
300.0010204082
400.0013605442
500.0017006803
1000.0034013605
5000.0170068027
10000.0340136054

Frequently asked questions

How many weys is 1 dram (apothecary/troy)?
1 dram (apothecary/troy) equals 3.401361e-5 wey.
How do I convert drams (apothecary/troy) to weys?
Multiply the value in drams (apothecary/troy) by 3.401361e-5 to get weys.
How do I convert weys back to drams (apothecary/troy)?
Multiply the value in weys by 29400, or use the Wey to Dram (apothecary/troy) converter.
How many weys is 100 drams (apothecary/troy)?
100 drams (apothecary/troy) equals 0.0034013605 weys, because 100 × 3.401361e-5 = 0.0034013605.

Convert Dram (apothecary/troy) to other weight units

Show all Dram (apothecary/troy) conversions
Metric / SI (18 units)
Dram (apothecary/troy) to Attogram (ag) Dram (apothecary/troy) to Femtogram (fg) Dram (apothecary/troy) to Picogram (pg) Dram (apothecary/troy) to Nanogram (ng) Dram (apothecary/troy) to Microgram (µg) Dram (apothecary/troy) to Milligram (mg) Dram (apothecary/troy) to Centigram (cg) Dram (apothecary/troy) to Decigram (dg) Dram (apothecary/troy) to Gram (g) Dram (apothecary/troy) to Dekagram (dag) Dram (apothecary/troy) to Hectogram (hg) Dram (apothecary/troy) to Kilogram (kg) Dram (apothecary/troy) to Quintal (metric) (q) Dram (apothecary/troy) to Metric Ton (t) Dram (apothecary/troy) to Gigagram (Gg) Dram (apothecary/troy) to Teragram (Tg) Dram (apothecary/troy) to Petagram (Pg) Dram (apothecary/troy) to Exagram (Eg)
Avoirdupois (15 units)
Dram (apothecary/troy) to Grain (gr) Dram (apothecary/troy) to Dram (avoirdupois) (dr) Dram (apothecary/troy) to Ounce (oz) Dram (apothecary/troy) to Pound (lb) Dram (apothecary/troy) to Clove (clove) Dram (apothecary/troy) to Stone (US) (st) Dram (apothecary/troy) to Stone (UK) (st) Dram (apothecary/troy) to Quarter (US) (qr) Dram (apothecary/troy) to Quarter (UK) (qr) Dram (apothecary/troy) to Hundredweight (US) (cwt) Dram (apothecary/troy) to Hundredweight (UK) (cwt) Dram (apothecary/troy) to Wey (wey) Dram (apothecary/troy) to Kilopound (kip) (kip) Dram (apothecary/troy) to Ton (short, US) (sh tn) Dram (apothecary/troy) to Ton (long, UK) (long tn)
Troy & Apothecary (9 units)
Dram (apothecary/troy) to Point (1/100 carat) (pt) Dram (apothecary/troy) to Carat (metric) (ct) Dram (apothecary/troy) to Scruple (apothecary) (s ap) Dram (apothecary/troy) to Pennyweight (dwt) Dram (apothecary/troy) to Momme (mom) Dram (apothecary/troy) to Mace (mace) Dram (apothecary/troy) to Troy Ounce (oz t) Dram (apothecary/troy) to Tael (tael) Dram (apothecary/troy) to Pound (troy/apothecary) (lb t)
Indian / South Asian (6 units)
Dram (apothecary/troy) to Ratti (ratti) Dram (apothecary/troy) to Masha (masha) Dram (apothecary/troy) to Tola (tola) Dram (apothecary/troy) to Chittack (Chatank) (chittack) Dram (apothecary/troy) to Seer (Ser) (seer) Dram (apothecary/troy) to Maund (Mann) (maund)
Scientific / Atomic (9 units)
Dram (apothecary/troy) to Electron Mass (rest) (me) Dram (apothecary/troy) to MeV/c2 (MeV/c²) Dram (apothecary/troy) to Muon Mass (mµ) Dram (apothecary/troy) to Atomic Mass Unit (u) Dram (apothecary/troy) to Proton Mass (mp) Dram (apothecary/troy) to Neutron Mass (mn) Dram (apothecary/troy) to Deuteron Mass (md) Dram (apothecary/troy) to Carbon-12 Atom Mass (C-12) Dram (apothecary/troy) to Planck Mass (mP)
Astronomical (4 units)
Dram (apothecary/troy) to Lunar Mass (Moon) (M☾) Dram (apothecary/troy) to Earth's Mass (M⊕) Dram (apothecary/troy) to Jupiter Mass (MJ) Dram (apothecary/troy) to Sun's Mass (M☉)
Biblical / Ancient (14 units)
Dram (apothecary/troy) to Lepton (Biblical Roman) (lepton) Dram (apothecary/troy) to Quadrans (Biblical Roman) (quadrans) Dram (apothecary/troy) to Assarion (Biblical Roman) (assarion) Dram (apothecary/troy) to Gerah (Biblical Hebrew) (gerah) Dram (apothecary/troy) to Drachma (Biblical Greek) (drachma) Dram (apothecary/troy) to Denarius (Biblical Roman) (denarius) Dram (apothecary/troy) to Bekan (Biblical Hebrew) (bekah) Dram (apothecary/troy) to Didrachma (Biblical Greek) (didrachma) Dram (apothecary/troy) to Shekel (Biblical Hebrew) (shekel) Dram (apothecary/troy) to Tetradrachma (Biblical Greek) (tetra) Dram (apothecary/troy) to Mina (Biblical Greek) (mina) Dram (apothecary/troy) to Mina (Biblical Hebrew) (mina) Dram (apothecary/troy) to Talent (Biblical Greek) (talent) Dram (apothecary/troy) to Talent (Biblical Hebrew) (talent)
Force / Engineering (5 units)
Dram (apothecary/troy) to Poundal (pdl) Dram (apothecary/troy) to Ton (assay) (US) (AT) Dram (apothecary/troy) to Ton (assay) (UK) (AT) Dram (apothecary/troy) to Kilogram-force square second/meter (hyl) Dram (apothecary/troy) to Slug (slug)

Sources & references

Conversion factor (1 dr ap = 3.401361e-5 wey) verified against the following authoritative sources:

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