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Troy Weight Units

Troy weights are currently in use for the measurement of the weight of precious metals, gems and gunpowder. The system currently in use is based on the British Imperial troy system, that is also incorporated in American customary units. In the past there were other troy weight systems including Holland troy, Paris troy, Bremen troy and Scottish troy in use in European countries.

The troy pound is 12 troy ounces rather than the 16 ounces that are usual in the avoirdupois system (British Imperial and American Customary units) with the troy pound being 5,760 grains as opposed to the 7,000 grains in the avoirdupois system. The grain has a common value between the two weight systems.

Table of Units

Relationships Between Troy Weights

• 1 troy pound = 12 troy ounces
• 1 troy ounce = 20 pennyweights
• 1 pennyweight = 24 grains