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The troy ounce (oz t) is a unit of imperial measure, now commonly only used for the mass (weight, in common parlance) of precious metals. One troy ounce is now defined as exactly 31.1034768 g. The troy ounce is about 10% heavier (ratio 192/175) than the avoirdupois ounce which equals 28.349523125 g.
That unfortunately means that the people from the United States are at a small disadvantage, when it comes to properly measuring these things with the standard machines we might use in day to day life. 1  1 troy ounce = 31.1034768 grams or 480 grains.  1 ounce = 28.3495231 grams or 437.5 grains.