
In the United States, the length of a nail is designated by its penny size. For example, a 10-penny nail is written as 10d. The penny measurement goes back to 15th-century England, where it referred to the price for 100 nails. A nail about 3 inches long would cost 10 pence per hundred. The larger the nail, the higher the cost.
| Characteristics | Values |
|---|---|
| Length | 3 inches |
| Price | 10 pence per hundred |
| Abbreviation | 10d |
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What You'll Learn
- The penny system for measuring nails goes back to 15th-century England, when it referred to the price for 100 nails
- The larger the nail, the higher the cost per long hundred
- Nails are still measured in pennies in the United States
- The penny size increases by one to two for every 1/4-inch of length added to the nail
- The word penny is abbreviated as d, which comes from the Latin name for a silver coin, the denarius

The penny system for measuring nails goes back to 15th-century England, when it referred to the price for 100 nails
In the United States, the length of a nail is designated by its penny size, written with a number and the abbreviation 'd' for penny, for example, 10d for a ten-penny nail. A larger number indicates a longer nail. The penny system is still commonly used in the United States, but it is growing more common for professionals to refer to the length of the nail to avoid confusion.
The word 'penny' is a reference to the Latin name of the most common silver coin used in ancient Rome, the denarius.
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The larger the nail, the higher the cost per long hundred
In the United States, the length of a nail is designated by its penny size, written with a number and the abbreviation 'd' for penny. For example, 10d refers to a ten-penny nail. The penny measurement goes back to 15th-century England, where it referred to the price for 100 or 120 nails. The larger the nail, the higher the cost per long hundred.
The penny system is still commonly used in the United States, although it is becoming more common for professionals to refer simply to the length of the nail to avoid confusion. Penny sizes typically increase by one to two for every 1/4 inch of length added to the nail. For example, a 2-inch nail is referred to as a "6-penny" nail or "6d".
The use of the word "penny" in the system is a reference to the Latin name of the most common silver coin used in ancient Rome, the denarius. While the term "penny" is typically abbreviated as "d" in writing, most people pronounce it as "penny" when speaking.
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Nails are still measured in pennies in the United States
While penny size is still commonly used in the United States, it is growing more common for professionals to refer to the length of the nail to avoid confusion. The penny system is often used by older, highly experienced construction workers or woodworkers.
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The penny size increases by one to two for every 1/4-inch of length added to the nail
In the United States, the length of a nail is designated by its penny size. This is written with a number and the abbreviation 'd' for penny, for example, 10d for a ten-penny nail. The penny measurement goes back to the 15th century in England and referred to the price for 100 nails. A nail about 3 inches long would cost 10 pence per hundred. The larger the nail, the higher the cost per long hundred.
Penny sizes are still commonly used in the United States, but it is becoming more common for professionals to refer to the length of the nail to avoid confusion.
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The word penny is abbreviated as d, which comes from the Latin name for a silver coin, the denarius
In the United States, the length of a nail is designated by its penny size, written with a number and the abbreviation 'd' for penny. For example, 10d for a ten-penny nail. The word 'penny' is abbreviated as 'd', which comes from the Latin name for a silver coin, the denarius. The penny measurement goes back to the 15th century in England and referred to the price for 100 nails. A nail about 3 inches long would cost 10 pence per hundred. The larger the nail, the higher the cost per long hundred. Penny sizes are still commonly used in the United States, but it is growing more common for professionals to refer to the length of the nail to avoid confusion.
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Frequently asked questions
10d refers to the length of a nail. The penny system goes back to 15th-century England, where the price for 100 nails was designated by their length. A nail about 3 inches long would cost 10 pence per hundred. The larger the nail, the higher the cost.
The 'd' in 10d is an abbreviation of the Latin name of the most common silver coin used in ancient Rome, the denarius.
While the penny system is still commonly used in the United States, it is becoming more common for professionals to refer to the length of the nail to avoid confusion.
From 2d to 16d nails, the penny size increases by one to two for every 1/4-inch of length added to the nail. For 20d nails and longer, the penny size increases by 10 per 1/2-inch of length.
The penny system is often used by older, highly experienced construction workers or woodworkers. Younger professionals or hobbyists may be unfamiliar with the system.


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