Apothecaries' Weight System

Apothecaries' Fluid Measure

• 1 U.S. fluid ounce = 8 drachms = 1.805 cubic inch = 1/128 U. S. gallon
• 1 fluid drachm = 60 minims
• 1 British fluid ounce = 1.732 cubic inch

Apothecaries' Weight

• 1 pound = 12 ounces = 5760 grains
• 1 ounce = 8 drachms = 480 grains
• 1 drachm = 3 scruples = 60 grains
• 1 scruple = 20 grains