How Many Grams Are There in a 1-Ounce Gold Bar?

The troy ounce is almost exclusively used to measure precious metals such as silver, gold, and platinum. The avoirdupois ounce is used to measure most other goods such as foods, dyes and livestock. The troy ounce and avoirdupois ounce each have a corresponding pound unit. There are 12 troy ounces in a troy pound, and 16 avoirdupois ounces in an avoirdupois pound. Both troy and avoirdupois units originated in France.