how many grains in a troy ounce
That unfortunately means that the people from the United States are at a small disadvantage, when it comes to properly measuring these things with the standard machines we might use in day to day life. 1  1 troy ounce = 31.1034768 grams or 480 grains.  1 ounce = 28.3495231 grams or 437.5 grains.