# Grains to Drams (gr to dr) Source: https://www.unitconvertercalculator.com/weight/grains-to-drams/ **1 gr = 0.036571428571429 dr** One grain equals exactly 1/27.34375 drams, or approximately 0.03657 drams. Both units belong to the avoirdupois system, with exactly 27.34375 grains per dram. The grain (the smallest avoirdupois unit) and the dram (the next step up) were both used in English trade, but the grain outlived the dram by finding an irreplaceable role in ammunition manufacturing. ## Formula Apply the conversion factor ## Conversion Table | Grains (gr) | Drams (dr) | |---|---| | 1 gr | 0.036571428571429 dr | | 5 gr | 0.18285714285714 dr | | 10 gr | 0.36571428571429 dr | | 15 gr | 0.54857142857143 dr | | 20 gr | 0.73142857142857 dr | | 27.34 gr | 0.99986285714286 dr | | 50 gr | 1.8285714285714 dr | | 100 gr | 3.6571428571429 dr | | 200 gr | 7.3142857142857 dr | | 437.5 gr | 16 dr | | 480 gr | 17.554285714286 dr | | 500 gr | 18.285714285714 dr | | 1000 gr | 36.571428571429 dr | | 5000 gr | 182.85714285714 dr | | 7000 gr | 256 dr | ## Units ### Grain (gr) A grain is a unit of mass equal to exactly 64.79891 milligrams. It is the same in the avoirdupois, troy, and apothecaries' systems, derived from the 1959 international agreement defining the pound as exactly 0.45359237 kilograms. ### Dram (dr) A dram (avoirdupois) is a unit of mass equal to 1/16 of an ounce or 1/256 of a pound (1.7718451953125 grams). Historically used in pharmacy and old cooking recipes. ## Background A 5-grain aspirin tablet is about 0.183 drams. A 150-grain rifle bullet is about 5.49 drams. Before metrication, a pharmacist might have dispensed both medicines and measured both in grains and drams, using the same balance for healing and (indirectly) for harming. Today, the grain serves ballistics while the dram has largely retired. ## Good to Know The avoirdupois system's survival depends almost entirely on the grain. The dram is obsolete, the ounce competes with grams, and the pound competes with kilograms. But the grain has no metric competitor at its scale - 64.8 milligrams is an awkward number in metric, while it is a clean 1 in grains. As long as the shooting sports industry uses grains, the avoirdupois system's smallest unit will continue to justify the system's existence. ## FAQ ### How many grains are in one dram? Exactly 27.34375 grains make one avoirdupois dram. This comes from the avoirdupois system: 7,000 grains per pound, 256 drams per pound, so 7,000 / 256 = 27.34375. ### Why is the ratio not a whole number? The grain and dram were standardized at different times for different purposes. The grain (1/7,000 of a pound) and the dram (1/256 of a pound) have a ratio that produces a fractional number. The avoirdupois system was not designed for mathematical elegance. ### Which unit is more useful today? The grain is far more useful. It remains the standard unit for bullet weights and powder charges in ammunition manufacturing worldwide. The dram is essentially obsolete. ## Non-Frequently Asked Questions ### Why did the grain survive while the dram faded? The grain found a niche that no other unit could fill: ammunition. Bullet weights of 55 to 300 grains produce manageable whole numbers. In drams, those same bullets weigh 2.01 to 10.97 drams - less tidy numbers. Grains also work well for powder charges of 15 to 60 grains. The grain's scale was perfectly matched to ammunition; the dram's was not matched to anything that survived. ### Is 27.34375 grains per dram a number any human remembers? Almost certainly not. Even dedicated handloaders, who know grain weights by heart, never need to convert to drams. They go from grains directly to grams if metric is needed. The 27.34375 factor is a mathematical artifact of a system designed long before anyone planned to connect its sub-units across levels. ### If drams made a comeback in ammunition, would anything improve? Nothing would improve. A 168-grain match bullet becoming '6.14 drams' offers no advantage. Powder charges of '42.5 grains' becoming '1.554 drams' adds an unnecessary decimal. The grain provides cleaner numbers at the scale ammunition operates. 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