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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.
A possible source of confusion is that gold is often priced on the open market in the more traditional troy ounce (one troy ounce is exactly 31.1034768 grams, which is larger than the avoirdupois ounce generally in use in the United States and has a mass of 28.35 grams). Kilogram gold prices are commonly used by the Zurich Gold Pool where 1,000 ...
[1]: 74 Since the implementation of the international yard and pound agreement of 1 July 1959, the grain or troy grain (symbol: gr) measure has been defined in terms of units of mass in the International System of Units as precisely 64.798 91 milligrams. [6]: C-19 [9] One gram is thus approximately equivalent to 15.432 36 grains. [6]:
The mithkal or sextula (in Persian and Arabic: مثقال) is an Arabic unit of weight used in Middle East, mostly for weighing gold and Saffron. It is equivalent to a little over 4.6 grams. It is equivalent to a little over 4.6 grams.
Gold dinar of Umayyad Caliph Abd al-Malik ibn Marwan, minted at Damascus, Syria in AH 75 (697/698 CE), having a weight of almost 1 mithqāl (4.25 grams). Mithqāl (Arabic: مثقال) is a unit of mass equal to 4.25 grams (0.137 ozt) which is mostly used for measuring precious metals, such as gold, and other commodities, like saffron.
(A kilogram bullion bar contains 32.151 troy ounces.) For historical measurement of gold, a fine ounce is a troy ounce of pure gold content in a gold bar, computed as fineness multiplied by gross weight [5] a standard ounce is a troy ounce of 22 carat gold, 91.66% pure (an 11 to 1 proportion of gold to alloy material)
1/4 imp gal or 40 imp fl oz 1.0 imp qt (1,100 ml; 38 US fl oz) imperial pint: imppt imp pt 1/8 imp gal or 20 imp fl oz 1.0 imp pt (0.57 L) imperial fluid ounce: impoz (impfloz) imp fl oz 1/160 imp gal 1.0 imp fl oz (28 ml; 0.96 US fl oz) impoz USoz; impoz U.S.oz; impoz ml; impoz mL; US customary liquid measure: US barrel: USbbl US bbl
Conversions between units in the metric system are defined by their prefixes (for example, 1 kilogram = 1000 grams, 1 milligram = 0.001 grams) and are thus not listed in this article. Exceptions are made if the unit is commonly known by another name (for example, 1 micron = 10 −6 metre).