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What Is The Difference Between Troy And Avoirdupois Weight?

apothecaries' system

Troy weight is a measure of mass and not weight, which is how much something weighs. Troy weight is also known as troy ounces, or troy lb. (lb. stands for pound). Apothecaries’ weight is also known as avoirdupois pounds and is used in the United States, and Canada. Other countries follow the English system to measure volume respectively. Troy weights originated from Troyes, France, and were used to weigh gold and silver by traders who were not part of the French government’s monopolistic system at the time.

What is Troy’s Weight?

Troy weight is a system of measurement that was historically used for precious metals and gemstones. The troy ounce (abbreviated as out) is the standard unit of measure in the troy weight system. It is equal to 31.1034768 grams. The troy pound (abbreviated as lbs) is equal to 12 ozt, or 373.2417216 grams.

In the United States, the troy ounce is still used when referring to the weight of gold, silver, and other precious metals and gemstones. For example, when buying gold bullion or coins, you will usually see the price quoted in terms of troy ounces. When weighing these items, they are typically placed on a balance scale that uses Troy weights.

What is Avoirdupoi’s Weight?

Avoirdupois weight is a system of measurement that was created in the 13th century. This system uses a unit of measure called the pound. The pound is divided into 16 ounces. The avoirdupois ounce is 28.35 grams, and the avoirdupois pound is 453.59 grams.

The avoirdupois system is used to measure the weight of many different objects, including food, gems, and other materials. This system is also used to measure the weight of people and animals.

The term “avoirdupois weight” is derived from the French words for “goods of weight,” and it is the system of measurement we use in the United States for most everyday objects. The avoirdupois pound is equal to 16 ounces, or 7,000 grains. The grain is the smallest unit of measurement in the avoirdupois system and is equal to 1/7,000th of a pound. The ounce is the next largest unit and is equal to 1/16th of a pound.

In addition to the pound and ounce, other units of measure in the avoirdupois system include the ton, which equals 2,000 pounds; the hundredweight, which equals 100 pounds; and the stone, which equals 14 pounds.

What is Apothecaries’ Weight?

Apothecaries’ weight is a system of units used to measure the weight or mass of substances like drugs and other chemicals. The apothecaries’ system is similar to the avoirdupois system, but there are some key differences. For instance, in the apothecaries’ system, the pound is divided into 12 ounces instead of 16. In addition, the ounce is further subdivided into 20 parts called grains.

Apothecaries’ weight is a system of units used to measure the weight or mass of a substance. The most common unit of apothecaries’ weight is the grain (gr), which is equal to 1/7000th of a pound (lb), or 0.0648 grams (g). Other units of apothecaries’ weight include the dram (dr), ounce (oz), and pound (lb).

The apothecaries’ system was originally developed by medieval European pharmacists and physicians to standardize the weights and measures of medicinal ingredients. The system continued to be used into the 19th century when it was replaced by the metric system in many countries. In the United States, however, the apothecaries’ system remained in use until 1971, when it was officially replaced by the avoirdupois system.

Why do we have these different weights and how are they different from each other?

The answer to this question can be found by looking at the history of each weight system. The Troy system originated in the Middle Ages and was used for weighing precious metals like gold and silver. The Avoirdupois system, on the other hand, is a more modern system that was developed in the 18th century.

The main difference between these two systems is that the Troy system uses a different set of weights than the Avoirdupois system. For example, in the Troy system, 1 pound equals 12 ounces while in the Avoirdupois system, 1 pound equals 16 ounces. This means that when you are comparing weights between these two systems, you need to be aware of this difference.

One more contrast between these two frameworks is that the Troy framework is utilized basically for weighing valuable metals. While the Avoirdupois framework is utilized for universally useful gauging. This means that if you are trying to compare weights between different objects. It is best to use the Avoirdupois system.

Overall, the main difference between these two weight systems is their history and their intended use. If you are trying to compare weights between different objects, it is best to use the Avoirdupois system since it will give you the most accurate results.


We hope this article has helped to clear up any confusion you may have had about the difference between Troy’s and Avoirdupois’s weight. In short, Troy weight is used when measuring precious metals and gems, while Avoirdupois weight is used for everything else. When in doubt, always consult a professional to get an accurate measurement.