The troy ounce is a unit of measurement for precious metals . Their mass corresponds to the pharmacist's ounce (1 oz.tr. = 31.1034768 g, 1 kg ≈ 32.15075 oz.tr.), but only refers to the precious metal content. The mass of any alloy components of base metals and impurities is therefore subtracted from the total mass. It is also known as the Troy ounce in the Anglo-American system of measurement , named after the French city of Troyes , an important medieval trading center. The ounce is derived from the Roman unit uncia ( Latin uncia means "twelfth").
The troy ounce is mainly used to indicate the mass of precious metals ( gold , silver , platinum and palladium ), for example for investment coins . Internationally, gold , silver , platinum and palladium prices are given in US dollars per troy ounce.
- 1 troy ounce (oz.tr., troy ounce ) = 1 ⁄ 12 troy-pound (lb.tr.) = 20 pennyweight (dwt.) = 480 grain (gr.) = 31.1034768 grams (g)
- 175 troy ounces = 192 ounces of the Avoirdupois system
- 175 Troy pounds = 144 Avoirdupois pounds