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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.
One troy ounce = 480 grains, or 31.10 grams. There are also 20 pennyweights to a troy ounce. A troy pound contains 12 troy ounces (over 13 avoirdupois ounces) and is equivalent to 373.24 grams. 32.15 troy ounces = 1 kilogram. Consequently, a grocery store pound which weighs 16 avoirdupois ounces (or 453.59 grams) will contain about 14.58 troy ounces.