تحويل الرطل التروي إلى أونصة تروي: المعادن الثمينة والمجوهرات والأحجار الكريمة

Exactly 12 troy ounces equal 1 troy pound. This is a fixed, unchanging ratio used exclusively in precious metals. It differs from the avoirdupois system (used for everyday items), where 1 pound equals 16 ounces. The troy system's 12-ounce pound reflects its medieval origins in precious metals trading and remains the international standard for gold, silver, platinum, and gemstones.

The troy system developed independently for precious metals trading in medieval Europe because these commodities required different measurement standards than bulk goods. Precious metals are valuable in smaller quantities, so the troy ounce was defined as 480 grains (compared to avoirdupois ounce at 437.5 grains), making troy ounces heavier. The troy pound with 12 ounces proved more practical for precious metals commerce than the avoirdupois 16-ounce pound. This specialized system became standardized internationally and remains mandatory for all precious metals trading.