Ounce - Definitions

Definitions

Historically, in different parts of the world, at different points in time, and for different applications, the ounce (or its translation) has referred to broadly similar but different standards of mass.

Summary of ounce units
ounce variant equivalent in grams equivalent in grains
International avoirdupois ounce 28.3495231 437.5
International troy ounce 31.1034768 480
Apothecaries' ounce
Maria Theresa ounce 28.0668
Spanish ounce 28.75
Dutch metric ounce 100
Chinese metric ounce 50

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