تحويل الرطل التروي إلى بنيويت: المعادن الثمينة والمجوهرات وعلم النقود

Exactly 240 pennyweights equal 1 troy pound. This fixed relationship is the foundation of the troy weight system. To convert: multiply troy pounds by 240 to get pennyweights, or divide pennyweights by 240 to get troy pounds. For example, 2.5 troy pounds = 600 pennyweights. This precise 240:1 ratio has remained constant since the troy system standardization.

Pennyweights remain standard in American and British jewelry industries due to historical tradition and industry infrastructure. All jewelry scales, pricing systems, and supplier catalogs traditionally use pennyweights. One pennyweight = 1.555 grams approximately. While metric systems are increasingly adopted, pennyweights persist because existing tools, education, and supplier relationships are built around this unit. International jewelers often maintain dual systems for compatibility.