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Grain (mass)

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In many cultures, a grain is a unit of mass of the same order of magnitude as a single seed of a typical cereal crop. E.g. in Europe, the average mass of wheat or barley grains was historically used to define mass units. Since 1958, a grain or troy grain (symbol: gr) is internationally defined in terms of the metric system by the equation 1 gr = 64.79891 mg, i.e. 1 grain is exactly 64.79891 milligrams. The grain is the only unit which all three traditional English mass and weight systems (avoirdupois, Apothecaries’ and troy) have in common.

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In many cultures, a grain is a unit of mass of the same order of magnitude as a single seed of a typical cereal crop. E.g. in Europe, the average mass of wheat or barley grains was historically used to define mass units. Since 1958, a grain or troy grain (symbol: gr) is internationally defined in terms of the metric system by the equation 1 gr = 64.79891 mg, i.e. 1 grain is exactly 64.79891 milligrams. The grain is the only unit which all three traditional English mass and weight systems (avoirdupois, Apothecaries’ and troy) have in common. As a mass unit for pearls and diamonds, a metric grain or pearl grain is equal to 1⁄4 of a (metric) carat, i.e. 50 mg (0.77 gr).