Troy Weight Converter
Switch between the Troy system used for precious metals and the standard Avoirdupois system. Essential for investors and jewelers.
What is Troy weight and where is it used?
Troy weight is a system of units of mass used for precious metals (gold, silver, platinum) and gemstones. One Troy ounce is heavier than a standard (Avoirdupois) ounce.
What is the difference between Troy and Avoirdupois weight?
The standard system used in the US for groceries and mail is Avoirdupois. 1 standard ounce ≈ 28.35 grams. 1 Troy ounce ≈ 31.10 grams. There are 12 Troy ounces in a Troy pound, compared to 16 Avoirdupois ounces in a standard pound.
How many grains are in a Troy ounce?
There are exactly 480 grains in one Troy ounce. The "grain" is the only unit that is the same size in both the Troy and Avoirdupois systems.
Why do we use Troy ounces for gold?
The system dates back to the Middle Ages (specifically the fair of Troyes in France) and remains the international standard for precious metals to ensure consistency in trading and valuation.