La onza (símbolo: oz) es una unidad de masa usada desde la Antigua Roma para pesar con mayor precisión las mercancías y otros artículos, especialmente si su peso era menor que una libra romana. La onza todavía se usa corrientemente en los países anglosajones, y antiguamente su uso era más extendido en toda Europa.[cita requerida]

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An ounce (abbreviated oz; apothecary symbol: ℥) is a unit of mass used in most British derived customary systems of measurement. It is most pervasive in the retail sale of groceries in the United States, but is also used in many other matters of domestic and international trade. Similar customary uses include recipes in cookbooks and sales of bulk dry goods. Whilst various definitions have been used throughout history, two remain in common use: the equal to approximately 28.3 grams and the of about 31.1 grams. The avoirdupois ounce is widely used as part of the United States customary and British imperial systems, but the troy ounce is now only commonly used for the mass of precious metals such as gold, silver, platinum, palladium, rhodium, etc..

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