Homepage / Bullion Investment Basics: Troy - Weight


'Troy'
a System of Weight




Understanding the differences between the
Troy & Avoirdupois
systems of weight








The Troy and the Avoirdupois (pronounced: a-ver-du-pois) weight measurement systems, have many differences.

The Troy measurement system is used to weigh precious metals bullion, gemstones, and gunpowder.

The Avoirdupois measurement system is most commonly used in the United States, and it is used to weighing one's self or for weighing produce.

The majority of the world's population uses the Metric system of weight measurement.



troy oz scale


The place where people often get confused between the two systems of weight is when it comes to understanding their conversions between ounces and pounds.

  • One Troy ounce (ozt.)                = 31.10 grams
  • One Avoirdupois ounce (oz.)    = 28.35 grams


troy lbs scale


When weighing in pounds there are 12 Troy ounces in every Troy pound, however, there are 16 ounces in every Avoirdupois pound.

Furthermore, even though there are more grams in 1 Troy ounce, a Troy pound is lighter than 1 Avoirdupois pound (lb.):


  • Troy pound - 12ozt. x 31.10grams = 372.20 grams
  • Avoirdupois pound (lb) - 16oz. x 28.35grams = 453.60grams

It can get confusing if you try to weigh bullion in the Avoirdupois weight system, and it's not recommended, especially because precious metals bullion is priced on the market in Troy ounces. (gold, silver, platinum, palladium)

Although there is one exception: Copper.

Copper is the one precious metal that isn't price it Troy Ounces, instead it's priced by the Avoirdupois pound (lb.)

The conversion chart below can help you figure out the differences between the two systems of weight.

Copper per pound (lb.)






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Troy / Avoirdupois Conversion Chart

troy  avoirdupois conversion chart



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