Have you heard a coin’s load being given in “troy ounces” or “avoirdupois ounces” and also wondered, “what’s the difference?!”

Word HistoryAvoirdupois (pronounced avwa-du-pwah) This word comes from the Old French “aveir de peis,” or “goods that weight.” for most any item other than precious metals, if who lists a load in ounces, it’s assumed the this is the measurement they mean. The most commonly held explanation because that the origin of trojan ounces comes not from ancient Greece, yet instead native the city of Troyes, France sometime roughly the center ages.

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Turns out, over there IS other in a name. Trojan ounces are generally used as soon as weighing precious steels (like in America’s renowned Silver Eagle series). Things prefer groceries or every day items space weighed in avoirdupois ounces. For example, whenever you action on a range you’re gift weighed based on the avoirdupois system. We’ve supplied avoirdupois ounces together our every job weight system for so long, it’s not really essential to clues which form of oz we’re measuring in.

It’s favor comparing to apologize and… gold.

You can be wonder – but isn’t an ounce an ounce? In short, no. One avoirdupois oz weighs 28.3495 grams, when a troy ounce weighs 31.1035 grams. It’s believed that this is a throwback to the historic importance of precious steels in profession markets, and merchants’ need to have a typical unit of weight for gold, silver, gemstones and the like.

It could not seem prefer a great difference between the two varieties of ounces. However, the does become much more noticeable when you start talking about larger amounts. Not to mention that that’s once the real fun beginning – since even though a trojan ounce is an ext than one avoirdupois ounce, a troy pound weighs less than one avoirdupois pound.

Wait – how’s the possible? it is because a trojan pound is a particular unit, characterized as 12 troy ounces. Yet under the metric system, a pound is 16 ounces.

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Therefore if you measure pounds in grams:

1 trojan pound = 373.242 grams1 avoirdupois lb = 453.592 grams

It deserve to be a hefty principle to grasp, i know! yet it’s necessary information for anyone that buys valuable metal. For this reason the next time you see a gold, silver- or copper piece whose weight is provided in ounces, be sure you understand if you’re buying troy, or avoirdupois!


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