Troy ounce is the standard for weighing precious metals. When purchasing precious metals, you will find that the terms “Troy ounce” and “ounces” are used interchangeably. Non-precious metals, such as copper, are weighed in regular ounces known as “avoirdupois” ounces. One Troy ounce weighs roughly 21.104 grams, while an avoirdupois ounce weighs roughly 28 grams. As an example, a 1 Kilo silver bar weighs 32.15 Troy ounces. Conversely, a 1 Kilo copper bar weighs 35.27 ounces.
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