What is Troy Ounce?(2024) History & Conversion Guide

The concept of the “ounce” finds versatile applications in the field of metal measurement. One specific type of ounce is known as the troy ounce.  

This article aims to provide you with a comprehensive guide on troy ounces, compare with other ounces including their history, conversion factors, and common applications.

1. Definition of a Troy Ounce 

One troy ounce of gold and one troy ounce of silver value is equivalent to approximately 31.1035 grams or 0.0311034768 kilograms.

999 fine silver is 99.9% pure silver. It is a common standard for silver bullion and coins. One troy ounce of 999 fine silver weighs 31.1034768 grams.

A troy ounce is recognized as a weight unit primarily employed for measuring precious metals such as gold, silver, and platinum. It is different from the avoirdupois ounce, which is the standard ounce used for general weight measurement in many countries. 

2. The History of Troy Ounces

The troy ounce has been traced back to ancient Roman times. The system was refined during the medieval period and gained widespread acceptance in the trade of precious metals. The name “Troy” is believed to have come from Troyes, a French town where medieval fairs and marketplaces encouraged the interchange of gold and silver.

The Future of Troy Ounces

As the demand for precious metals continues to evolve, Troy ounces will likely maintain their significance in the global market. Advancements in technology and the emergence of digital currencies may introduce new forms of measurement, but troy ounces are expected to remain a standard unit for precious metal valuation.

What is Troy Ounce?

3. Difference Between Troy Ounce And Ounce

1. Troy Ounce vs. Avoirdupois Ounce 

The avoirdupois ounce, also known as the standard ounce, is used in everyday weight measurements for items like food, household objects, and non-precious metals. It is slightly larger than the troy ounce. 

One avoirdupois ounce is equivalent to approximately 28.3495 grams. 

2. Troy Ounce vs. Imperial Ounce 

The imperial ounce is another variant of the ounce used in the British Imperial System of measurement. It is also slightly larger than the troy ounce. 

One troy ounce is equivalent to approximately 1.0971 imperial ounces. 

3. 1 Troy Ounce and 1 Ounce 

When comparing 1 troy ounce and 1 ounce (avoirdupois ounce), the troy ounce is heavier. As mentioned earlier, one troy ounce is approximately equal to 31.1035 grams, whereas one avoirdupois ounce is roughly equivalent to 28.3495 grams

4. Troy Ounce Vs. Ounce Conversion

In the United States, the avoirdupois ounce is widely recognized as the “ounce” and serves as the primary unit of measurement for non-precious metal weights. Therefore, in the US context, the troy ounce and the ounce are different. The troy ounce is used specifically for weighing precious metals in the US market. 

5. Troy Ounce vs. Ounce Calculator 

If you need to convert between troy ounces and regular ounces, you can use an online converter or an ounce calculator to ensure accurate conversions. 

Why Are Troy Ounces Used for Precious Metals?

Troy ounces are specifically used for measuring precious metals due to their historical significance in the trade of these valuable commodities. The Troy weight system provides a standardized and widely accepted method for assessing the weight and purity of precious metals, ensuring transparency and accuracy in transactions.

4. Convert Troy Ounces to Grams and Other Units

Converting troy ounces to other units of measurement is essential for practical purposes. Here are some commonly used conversion factors:

  • 1 troy ounce = 31.1035 grams
  • 1 troy ounce = 20 pennyweights
  • 1 troy ounce = 480 grains
  • 1 troy ounce = 0.91146 troy pound

These conversion factors allow for seamless calculations and conversions when working with Troy ounces.

5. Troy Ounces in Gold and Silver Trading

The use of troy ounces is prevalent in the trading of gold and silver. Precious metal prices are typically quoted in troy ounces, and trading contracts are based on this unit of measurement. Understanding troy ounces is crucial for investors looking to buy or sell gold and silver on the market.

One troy ounce of gold price is $1,932.00 USD

one troy ounce of 999 silver price is $23.14 USD

6. The Role of Troy Ounces in Jewelry Making

Jewelers often use troy ounces to measure and calculate the weight of precious metals in their creations. Whether crafting gold necklaces, silver bracelets, or platinum rings, understanding troy ounces helps jewelers determine the metal’s value and price their designs accordingly.

7. Troy Ounces in Numismatics and Coin Collecting

Numismatists and coin collectors frequently rely on troy ounces to determine the precious metal content of coins. Many numismatic coins are minted with specific weights denominated in troy ounces, making it easier to assess their value based on the prevailing market prices for gold and silver.

What is Troy Ounce?

8. Troy Ounces in the Pharmaceutical Industry

In certain medical and pharmaceutical applications, troy ounces are used to measure the weight of active ingredients or compounds. This practice ensures accuracy in the preparation of medications and pharmaceutical formulations, where precise measurements are vital.

9. The Importance of Troy Ounces in Bullion Coins

Bullion coins, such as the American Gold Eagle or the Canadian Silver Maple Leaf, are often minted in troy-ounce denominations. This allows investors and collectors to easily determine the actual precious metal content of these coins and evaluate their worth in the market.

10. Troy Ounces & Weight Measurement in Sports

In the world of sports, troy ounces find relevance in the weight measurement of medals. Whether awarded at the Olympic Games or other prestigious sporting events, medals are often crafted using precious metals and are denominated in troy ounces.

11. The Price of Precious Metals in Troy Ounces

Precious metals market prices are typically quoted in troy ounces, reflecting the industry’s long-standing tradition. Investors and traders monitor these prices to assess the value of their holdings and make informed decisions about buying or selling precious metals.


In conclusion, troy ounces are an integral part of the world of precious metals. Understanding their history, applications, and conversion factors is crucial for investors, jewelers, and individuals interested in the weight of precious metals. By grasping the concept of troy ounces, you can navigate the intricacies of this field with confidence.

Are troy ounces only used for gold and silver?

No, troy ounces are used for precious metals such as gold, silver, platinum, and palladium.

How do I convert troy ounces to grams?

Multiply the number of troy ounces by the conversion factor of 31.1035 to get the equivalent weight in grams.

Can I sell my jewelry based on troy ounce weight?

Yes, jewelers often determine the value of precious metal jewelry based on the weight measured in troy ounces.

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