Grains to Ounces converter

To convert grains to ounces, enter the value in the first field. The result in ounces is calculated automatically using the exact conversion factor.

1 gr ≈ 0.00228571428571 oz
1 oz = 437.5 gr

Formula: oz ≈ gr × 0.00228571428571
gr = oz × 437.5

Definitions: 1 gr = 1/7000 lb; 1 oz = 1/16 lb

The grain (gr) is exactly 64.79891 milligrams and is the base of the avoirdupois, troy and apothecaries weight systems, originally based on a grain of barley. It is used today mostly for the weight of bullets and powder charges in ammunition.

The ounce (oz) here is the avoirdupois ounce, one sixteenth of a pound, or exactly 28.349523125 grams. It is used in the United States for food packages, postage and small goods, and it is not the same as the troy ounce used for precious metals or the fluid ounce, which measures volume.

See the conversion table with commonly used values, handy for quick reference or study.