The grain or "troy grain" (gr) is the non-metric unit of mass used in the Imperial and U.S. customary units. Since 1958, 1 grain (gr) = 0.00228571429 ounces (oz) = 0.06479891 grams (g) = 64.79891 milligrams (mg) = 0.00006479891 kilogram (kg).
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