Troy ounce

One troy ounce of gold in bar form

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.

According to today's definition, a troy ounce corresponds exactly to 31.1034768 grams .

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

The LBMA and LPPM standard ingots have a fine weight of 400 troy ounces.

See also

• Tola
• Metric carat , unit of precious stones
• Lot

literature

• Erich Robens: The Troy System . In: Balances, Instruments, Manufacturers, History . Springer, Heidelberg 2014, ISBN 978-3-642-36447-1 , p. 60–61 , doi : 10.1007 / 978-3-642-36447-1 (English, limited preview in Google book search).