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General Information, Facts & Tables
[Old Weight Units]

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Overview

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The tables below list some of the older imperial weight measurement units.
 

Apothecaries Weight Measure 

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The apothecaries measurement system is primarily used for medicinal drugs.
 

1 scruple (s ap)

 = 20 grains

 = 0.0648 grams

1 dram apoth (dr ap)

 = 3 scruples

 = 0.1944 grams

1 ounce apoth (oz ap)

 = 8 drams apoth

 = 1.5552 grams

1 pound apoth (lb ap)

 = 12 ounces apoth

 = 18.6624 grams

 

Troy Weight Measure

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Troy weight measure is primarily used for weighing precious metals (gold, silver, etc.)
 

1 pennyweight (dwt) 

 = 24 grains 

 = 0.0648 gram

1 ounce troy (oz t) 

 = 20 pennyweights (dwt) 

 = 1.296 gram

1 pound troy (lb t) 

 = 12 ounces troy (oz t) 

 = 15.552 gram

 

Avoirdupois Weight Measure

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Avoirdupois weight measurement was used for all weight measure except medicinal drugs (Apothecaries) and precious metals (Troy).
 

1 dram (dr)

 = 27.3437 grains

 = 1.77187176 grams (g)

1 ounce (oz)

 = 16 drams (dr)

 = 28.34994816 grams (g)

1 pound (lb)

 = 16 ounces (oz)

 = 453.59917056 grams (g)

1 quarter

 = 25 pounds (lb)

 = 11.339979264 kilograms (kg)

1 hundredweight (cwt)

 = 4 quarters

 = 45.359917056 kilograms (kg)

1 ton (tn)

 = 20 hundredweights (cwt)

 = 907.19834112 tonne

1 short ton

 = 2000 pounds (lb)

 = 907.19834112 tonne

1 long ton

 = 2240 pounds (lb)

 = 1016.0621420544 tonne