Table of Contents

Troy Ounce: Definition, History, and Conversion Table


A Troy Ounce is a unit of measure used in the precious metals market to gauge the weight of gold, silver, platinum, and other valuable commodities. Originating from the French city of Troyes in the Middle Ages, it weighs approximately 31.1 grams. A conversion table would be used to convert this measure to other units such as grams or pounds.


The phonetic spelling for “Troy Ounce: Definition, History, and Conversion Table” is:Troy Ounce: /ˈtrɔɪ ˈaʊns/Definition: /ˌdefɪˈnɪʃən/History: /ˈhɪstəri/And: /ænd/Conversion: /kənˈvɝːʒən/Table: /ˈteɪbəl/

Key Takeaways

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  1. Definition

    A Troy Ounce is a unit of measure used primarily in the precious metals industry. It is slightly heavier than an avoirdupois ounce, with one Troy Ounce equal to 31.1034768 grams.

  2. History

    The Troy Ounce has its origins in the Roman monetary system, more specifically from the city of Troyes in France where the system was standardised. It was later adopted by the British and the Americans, evolving into the primary unit of measure for gold, silver, platinum, and palladium.

  3. Conversion Table

    Here is a simple conversion table for Troy Ounce:

    • 1 Troy Ounce = 31.1034768 grams
    • 1 Troy Ounce = 1.09714286 ounces (Avoirdupois)
    • 1 Troy Ounce = 0.0685714 pounds

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The term “Troy Ounce” is crucial in business and finance, particularly in the precious metals industry, as it represents the standard unit of measurement for precious metals like gold, silver, and platinum. Its historical significance dates back to the Middle Ages in the city of Troyes, France and has since been institutionalized in global trade. It aids in standardizing transactions, providing a universal conversion table and enhancing accuracy in trade, pricing, and valuation. Understanding how a troy ounce is converted to regular ounces (1 troy ounce equals 1.097 regular ounces) is important for investors and traders as misinterpretation could result in financial miscalculations and impact profitability, making the understanding of the troy ounce an essential aspect of financial literacy in commodity investment and trading.


The term “Troy Ounce” originates from the monetary system of the ancient city of Troy and is primarily employed in the precious metals market to measure the weight and value of gold, silver, platinum, and palladium. Conventionally, the troy ounce is utilized due to its precision and universality in the industry. This measurement system allows buyers and sellers from different countries to communicate and carry out transactions consistently and effectively. When pricing these precious metals, the quote is usually given per troy ounce, thus functioning as a benchmark globally.Amid its historical context, the unique value of the troy ounce lies in its durability over centuries in assuring consistent standards in the trading of precious metals. Each troy ounce is precisely equal to 31.1034768 grams, larger than the conventional or avoirdupois ounce which is 28.3495231 grams. This difference, though slight, can significantly impact the value of large precious metal transactions. Therefore, it is central to understand the implication of the weight system used when engaging in precious metal deals. A universally accepted, purposefully precise system like the troy ounce enables both transparency and uniformity in worldwide trade.


1. Gold Trading: The most evident real-world example of the use of a troy ounce is in the trading of gold. Dealers, sellers, and buyers communicate gold prices and measurements in troy ounces worldwide. For example, when you look at the current price of gold, whether it’s in the news or online, the price quoted is almost always in troy ounces. 2. Coin Minting: Many countries, including the United States, Canada, and Britain, mint bullion coins (precious metal coins). These coins’ weights are also usually measured using troy ounces. Notably, the American Gold Eagle, the Canadian Gold Maple Leaf, and the British Britannia Gold coins all have some versions that weigh a troy ounce. 3. Jewelery Industry: Another prominent example of troy ounce usage is in the jewelry industry, where precious metals like gold and silver are frequently measured using this unit. When a jeweler quotes a price for a piece of jewelry, it’s largely based on the weight of the precious metal used, measured in troy ounces. For example, a necklace described as “18-karat gold and weighing 0.5 troy ounces” uses half a troy ounce of 18-karat gold. The weight of the gold is a significant portion of the item’s total cost.

Frequently Asked Questions(FAQ)

What is Troy Ounce?

A Troy Ounce is a unit of measure used specifically for weighing precious metals, gemstones and gunpowder. It is equal to approximately 31.1 grams.

How does Troy Ounce differ from the standard Ounces?

The difference lies in their weight. A standard ounce is equal to 28.35 grams while a Troy Ounce weighs 31.1 grams. It’s a common misconception that they are identical reiterate.

What is the history behind Troy Ounce?

The term ‘Troy Ounce’ originated from the French town of Troyes during the Middle Ages. This was a center of trade and many merchants would come to buy and sell goods, including precious metals. In order to standardize the measure of these metals, the Troy weight system was developed and is still in use today.

Is Troy Ounce used everywhere in the world?

Yes, the Troy Ounce is an internationally recognized unit of measure for precious metals. It is used in the pricing of Gold, Silver, Platinum, and Palladium on global commodity markets.

How do I convert grams into Troy Ounce?

To convert grams into Troy Ounces, you need to divide the number of grams by 31.1035.

How can I convert Troy Ounces into grams?

To convert Troy Ounces into grams, you need to multiply the number of Troy Ounces by 31.1035.

Why is the Troy Ounce measurement still important in finance and business today?

As the standard unit of measure for precious metals, the Troy Ounce plays a crucial part in the global trade and valuing of these commodities. Precious metals continue to play a significant role in finance, representing safe-haven assets, and form an important part of many investment portfolios. Precise and consistent measurement using the Troy Ounce helps to facilitate this trade.

Related Finance Terms

  • Definition: Troy Ounce is a unit of weight often used to measure precious metals like gold, silver, and platinum. It is slightly heavier than the conventional ounce used in grocery stores and is approximately equal to 31.1034768 grams.
  • History: The term “Troy Ounce” originates from Troyes, a town in France where it was widely used in trade during the Middle Ages. It was officially adopted by the International Troy Ounce in the year 1828.
  • Conversion Table: A Conversion Table for Troy Ounce indicates the equivalent values in different units of weight measurement. For instance, 1 Troy Ounce is equivalent to 31.1035 grams, 1.097 regular ounces, or 480 grains.
  • Troy Weight System: The Troy Ounce is part of the Troy weight system which also includes other units like pennyweight and grains. This system is commonly used in the precious metals industry worldwide.
  • Gold Price: The international trading price of gold is typically quoted per Troy Ounce. This provides a standard, internationally accepted measurement for investors and traders.

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