Ounces to grains conversion factor is 437.5 (for troy weight it is 480). To find out how many grains in ounces, multiply the ounce value by the conversion factor.
1 Ounce = 437.5 Grains
Ounce is an imperial and US Customary mass unit. Troy ounce is used for the measurement of precious metals, gold, silver etc. The abbreviation is "oz".
Grain is a unit of mass and based on the average mass of a seed of a cereal, barley and wheat. 1 pound equals to 7000 grains. It is also commonly used to measure the hardness of water and the mass of gunpowder. The abbreviation is "gr".