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  2. Grain (unit) - Wikipedia

    en.wikipedia.org/wiki/Grain_(unit)

    The grain was also the name of a traditional French unit equal to 53.115 mg. [5] In both British Imperial units and United States customary units, there are precisely 7,000 grains per avoirdupois pound, and 5,760 grains per troy pound or apothecaries' pound. [6]:

  3. Troy weight - Wikipedia

    en.wikipedia.org/wiki/Troy_weight

    The only troy weight in widespread use is the British Imperial troy ounce and its American counterpart. Both are based on a grain of 0.06479891 gram (exact, by definition), with 480 grains to a troy ounce (compared with 437 + 1 ⁄ 2 grains for an ounce avoirdupois). The British Empire abolished the 12-ounce troy pound in the 19th century.

  4. Imperial and US customary measurement systems - Wikipedia

    en.wikipedia.org/wiki/Imperial_and_US_customary...

    The troy pound (5760 grains) was used for precious metals, the apothecaries' pound, (also 5760 grains) was used by pharmacists and the avoirdupois pound (7000 grains) was used for general purposes. The apothecaries and troy pounds are divided into 12 ounces (of 480 grains) while the avoirdupois pound has 16 ounces (of 437.5 grains).

  5. Avoirdupois - Wikipedia

    en.wikipedia.org/wiki/Avoirdupois

    In the early 14th century several other specialized weight systems were used, including the weight system of the Hanseatic League with a 16-ounce pound of 7200 grains and an 8-ounce mark. [citation needed] However, the main weight system, used for coinage and for everyday use, was based on the 12-ounce tower pound of 5400 grains.

  6. Apothecaries' system - Wikipedia

    en.wikipedia.org/wiki/Apothecaries'_system

    On the Iberian Peninsula, apothecaries' weights in the 19th century were relatively uniform, with 24 grains per scruple (576 grains per ounce), the standard in Romance countries. The weight of an apothecaries' pound was 345.1 g in Spain and 344.2 g in Portugal .

  7. Dram (unit) - Wikipedia

    en.wikipedia.org/wiki/Dram_(unit)

    An ounce consisted of 437.5 grains, thus making the dram approximately 27.34 grains. drachm now meant only apothecaries' drachms, which were 1 ⁄ 8 of an apothecaries' ounce of 480 grains, thus equal to 60 grains.

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  9. Ounce - Wikipedia

    en.wikipedia.org/wiki/Ounce

    A troy ounce (abbreviated oz t) is equal to 480 grains. Consequently, the international troy ounce is equal to exactly 31.1034768 grams. There are 12 troy ounces in the now obsolete troy pound. Today, the troy ounce is used only to express the mass of precious metals such as gold, platinum, palladium, rhodium or silver.