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Apothecaries' Weight System

Apothecaries' fluid and weight system with ounces, drachms, grains, scruples and more.

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

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