Troy Ounce (oz t): Definition, Weight, Conversion & Uses
The troy ounce (symbol: oz t) is a traditional unit of mass primarily used to measure precious metals. It is part of the troy weight system and is commonly used for gold, silver, platinum, and palladium. A troy ounce is defined as exactly 31.1034768 grams, making it different from the ordinary ounce used for most commercial goods.
What Is a Troy Ounce?
A troy ounce is a unit of mass equal to exactly 31.1034768 grams. It is larger than the avoirdupois ounce, which is commonly used for everyday products and weighs approximately 28.3495 grams.
The distinction is especially important in precious-metal markets. When the price of gold or silver is quoted per ounce, it normally refers to a troy ounce rather than an ordinary avoirdupois ounce.
History of the Troy Ounce
The troy weight system has historical connections with the French city of Troyes and was widely used in European trade. The system became particularly important for weighing precious metals and coins. Over time, the troy ounce became the standard unit used in international precious-metal markets.
Current Uses of the Troy Ounce
The troy ounce is widely used in gold, silver, platinum, and palladium trading. Bullion coins, investment bars, jewellery materials, and precious-metal prices are commonly measured or quoted in troy ounces.
For example, when a market reports the price of gold per ounce, the quoted weight normally refers to one troy ounce. This makes understanding the difference between a troy ounce and an ordinary ounce important when buying or selling precious metals.
Troy Ounce Conversion
One troy ounce is equal to:
- 31.1034768 grams (g)
- 0.0311034768 kilograms (kg)
- 1.097142857 avoirdupois ounces (oz)
- 20 pennyweights (dwt)
- 480 grains (gr)
You can use ChangeUnit to convert troy ounce to gram, kilogram, avoirdupois ounce, and other mass units.