Convert Ounces to Grains
Convert Ounces (oz) to Grains (gr) instantly and accurately.
Conversion Formula
gr = oz × 437.5
About Ounces
The avoirdupois ounce (oz) is 1/16 of a pound, equal to approximately 28.35 grams. It is the everyday ounce used in the United States and United Kingdom for food portions, household quantities, and general trade. US food packages, recipe measurements, and nutrition labels reference ounces; a standard stick of butter is 4 oz, a can of soup typically 10.75 oz, and a baseball weighs 5-5.25 oz. Unlike the troy ounce (31.10 g) used for precious metals, the avoirdupois ounce (28.35 g) is lighter.
About Grains
A grain (gr) is the smallest unit in both the avoirdupois and troy weight systems, equal to exactly 64.79891 milligrams. Originally defined as the mass of a single grain of barley or wheat from the middle of an ear, it has been a standard of weight since ancient times. Today, grains are used to weigh gunpowder charges and bullets (a standard .308 rifle bullet weighs 168 gr), pharmaceutical preparations in apothecary compounding, and the fineness of gold alloys. Arrowhead and fishing hook weights are also specified in grains.
Quick Reference Table
| Ounces (oz) | Grains (gr) |
|---|---|
| 1 oz | 437.5 gr |
| 2 oz | 875 gr |
| 5 oz | 2187.5 gr |
| 10 oz | 4375 gr |
| 25 oz | 10937.5 gr |
| 50 oz | 21875 gr |
| 100 oz | 43750 gr |