Conversions Between Troy Weight Units


For most weight conversions you can use our multi-unit converter to select the unit to convert and the amount to be converted by selecting the unit from the drop down and entering the amount in the box below. Change the weight system by selecting from the top selecters.

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

Unit Abbreviation As Grains As Grams Notes
grain gr 1 0.06479891 The smallest unit of the troy system
pennyweight dwt 24 1.55517384
troy ounce oz t 480 31.1034768 The most commonly seen troy unit
troy pound troy 5,760 373.2417216 Abolished in British troy, still extant in the American system

Relationships Between Troy Weights

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