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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