Mass and Weight · Unit Converter

Convert Dram (avoirdupois) to Hundredweight (US)

Convert drams (avoirdupois) to hundredweights (us) instantly. 1 dram (avoirdupois) = 3.90625e-5 hundredweight (us) — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Hundredweight (US) 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.

Avoirdupois

Hundredweight (US)

What is a hundredweight (us)?

The US (short) hundredweight equals 100 pounds, about 45.36 kilograms.

Origin of the hundredweight (us)

The American 'hundred'-pound commercial weight (also called the cental).

Where it is used

US commodity trade in grain, livestock feed, and produce.

When and where it was developed

Standardized at 100 pounds in US customary units.

Dram (avoirdupois) to Hundredweight (US) conversion formula

The relationship between drams (avoirdupois) and hundredweights (us):

1 dr = 3.90625e-5 cwt
1 cwt = 25599.999932274 dr

To convert drams (avoirdupois) to hundredweights (us), multiply the value in drams (avoirdupois) by 3.90625e-5. To reverse, multiply hundredweights (us) by 25599.999932274.

How to use this converter

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

Step-by-step: convert drams (avoirdupois) to hundredweights (us)

  1. Write down the value in drams (avoirdupois) (dr).
  2. Multiply that value by the factor 3.90625e-5.
  3. The product is the equivalent value in hundredweights (us) (cwt).
  4. To reverse, multiply the hundredweight (us) value by 25599.999932274.

Worked examples

Example 1 — Convert 1 dr to cwt:
1 × 3.90625e-5 = 3.90625e-5 cwt

Example 2 — Convert 100 dr to cwt:
100 × 3.90625e-5 = 0.00390625 cwt

Real-world example — Postcard and small-object dimensions

A postcard is about 5 drams (avoirdupois) wide. Converting to hundredweights (us) is essential for international postal addressing forms that ask for dimensions in different units across countries.

5 dr × 3.90625e-5 = 0.0001953125 cwt

Real-world example — Ruler-scale measurements

A 30-dram (avoirdupois) school ruler converts cleanly to hundredweights (us) — useful when buying a desk accessory from a retailer whose product specs use a different unit.

30 dr × 3.90625e-5 = 0.001171875 cwt

Real-world example — Hardware-scale dimensions

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

10 dr × 3.90625e-5 = 0.000390625 cwt

Dram (avoirdupois) to Hundredweight (US) conversion table

Standard reference values for converting drams (avoirdupois) to hundredweights (us):

Dram (avoirdupois) [dr]Hundredweight (US) [cwt]
0.013.90625e-7
0.13.90625e-6
13.90625e-5
27.8125e-5
30.0001171875
40.00015625
50.0001953125
100.000390625
200.00078125
300.001171875
400.0015625
500.001953125
1000.00390625
5000.0195312501
10000.0390625001

Frequently asked questions

How many hundredweights (us) is 1 dram (avoirdupois)?
1 dram (avoirdupois) equals 3.90625e-5 hundredweight (us).
How do I convert drams (avoirdupois) to hundredweights (us)?
Multiply the value in drams (avoirdupois) by 3.90625e-5 to get hundredweights (us).
How do I convert hundredweights (us) back to drams (avoirdupois)?
Multiply the value in hundredweights (us) by 25599.999932274, or use the Hundredweight (US) to Dram (avoirdupois) converter.
How many hundredweights (us) is 100 drams (avoirdupois)?
100 drams (avoirdupois) equals 0.00390625 hundredweights (us), because 100 × 3.90625e-5 = 0.00390625.

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 = 3.90625e-5 cwt) verified against the following authoritative sources:

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