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The standard unit of mass in United States is the Avoirdupois system. There are other systems used around the world such as Troy Weight system (United Kingdom) or the Apothecaries' Weight system.
Different weight systems have different measurements for the pound unit.
Pound (lb) is an Imperial system mass unit. 1 Pound is equal to 16 ounces and 1 troy pound is equal to 12 troy ounces. The symbol is lb.
Ounce is an imperial system mass unit. The symbol is oz
For more information, the formula and other conversions you can use our free Mass Converter