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Yes thanks. Twelve troy ounces to one troy pound.
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https://www.investopedia.com/terms/t/troyounce.asp

Troy Ounce: Definition, History, and Conversion Table

By JAMES CHEN Updated February 05, 2023
Reviewed by SOMER ANDERSON
Fact checked by KATRINA MUNICHIELLO

What Is a Troy Ounce?

A troy ounce is a unit of measure used for weighing precious metals that dates back to the Middle Ages. Originally used in Troyes, France, one troy ounce is equal to 31.1034768 grams, according to the U.K. Royal Mint.
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One standard ounce (also known as an avordupois ounce) is used to weigh other commodities such as sugar and grain. A standard ounce is slightly less than a troy ounce, at 28.35 grams.

The troy ounce is to this day the standard unit of measurement in the precious metals market to ensure purity standards. The troy ounce is often abbreviated to read “t oz” or “oz t.”

KEY TAKEAWAYS

The troy ounce is a metric used in weighing precious metals.

The troy ounce is the equivalent of 31.1034768 grams.

A standard ounce is the equivalent of 28.349 grams, or around 10% less.

A troy pound (12 troy ounces) is lighter than a standard pound (14.6 troy ounces).
The troy ounce is the last remaining metric still used in the troy weighting system.

Understanding the Troy Ounce
The troy ounce is the only measure of the troy weighting system that is still used in modern times. It is used in the pricing of metals, such as gold, platinum, and silver. Thus, when prices of precious metals are listed per-ounce, it is often referencing the troy ounce.

It was also used when weighing certain gemstones. The troy weight system, however, has largely been replaced by the carat system in the world of precious gems and stones.

History of the Troy Ounce
The troy system for weights and measures is believed to have gotten its name from the French city of Troyes, a business hub in the Middle Ages that attracted merchants from around Europe and Britain.
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In Troyes, merchants measured 480 grains of barley to equal a troy ounce, and 12 troy ounces equaled one troy pound.

Some historians, however, believe the troy ounce had its origins in Roman times. Romans standardized their monetary system using bronze bars that could be broken down into 12 pieces called “uncia” or ounce, with each piece weighing around 31.1 grams.

As Europe’s economic importance grew from the 10th century onward, merchants came from all over the world to buy and sell goods there. It was, therefore, necessary to develop a new standardized monetary weight system to make doing business much easier. Some believe the merchants of Troyes modeled their new monetary system on the weights developed by their Roman ancestors.

Before the adoption of the metric system across Europe, the French-born King Henry II of England adjusted the British coinage system to better reflect the French troy system. The system was adjusted periodically, but troy weights, as we know them today, were first used in England in the 15th century.

Prior to the adoption of the troy system, the British used an Anglo-Norman French system called the avoirdupois system. The word means “goods of weight” and was used to weigh both precious metals and non-precious metal goods. By 1527, the troy ounce became the official standard measurement for gold and silver in Britain, and the U.S. followed suit in 1828.
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Troy Ounce vs. Ounce
The avoirdupois ounce, simply referred to as ounce (oz), is the standard used in the US to measure foods and other items, with the exception of precious metals and gems. It is the equivalent of 28.349 grams or 437.5 grains. A troy ounce is a little heavier, with a gram equivalent of 31.1. The difference (2.751) may be minute for a small quantity, but can be substantial for large quantities.
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When the price of gold is said to be US $653/ounce, the ounce being referred to is a troy ounce, not a standard ounce. Because a troy ounce is heavier than a standard ounce, there are 14.6 troy ounces—compared to 16 standard ounces—in one pound. This pound is not to be confused with a troy pound, which is lighter and is made up of 12 troy ounces.
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