Measuring the Thickness of Leather

In our reviews, we often talk about the thickness of leather. The thickness of a piece of leather affects its durability and flexibility, meaning it’s important for the informed consumer to have a general idea of leather thickness is and what types of products each range is used for. There are several ways to measure the thickness of leather, which we will explain below.

The Ounce
We most frequently refer to the thickness of leather in terms of “ounces.” This can be confusing because the term actually refers to a linear measurement as opposed to weight. In the leather industry, an ounce is 1/64 of an inch. So, if you have a piece of leather that is 8 ounces, it’s 8/64 of an inch. An easy reference point is to remember that a U.S. quarter is 4 ounces in thickness.

Hides can be through a splitting machine that can skive a piece of leather down to the desired measurement. But each animal is different and a hide can vary in thickness, so most of the time you’ll see each measurement presented as a range, such as 6-7 oz. The image below, from the Tandy Leather Buying Guide, shows a conversion chart between ounces, irons, inches, and millimeters, as well as a visual representation of the measurement.

The Iron
The Iron is an old, but still occasionally used standard for measuring the thickness of leather. It is most often seen in shoe manufacturing, especially in the UK, although the millimeter is a much more common measurement now. There are 48 irons in an inch, so each iron is a little larger than an ounce.

 

 

What are different thicknesses used for?

Shoes
An average leather outsole on a shoe is around 12oz (9 irons) thick. A leather insole is typically around 14oz in thickness to accommodate the welt. A shoe upper is around 5oz on a typical dress/business shoe, and the lining is about 1oz.

Of course, these thicknesses often vary with the type of shoe, type of welt, and type of leather used. Italian dress shoes are usually sleeker and thus use thinner leather in the soles and uppers. Blake stitched or bonded soles don’t require a thick insole like Goodyear welted shoes.

Bags
Bags are generally crafted from medium weight leather, and can be anywhere from 3-7 ounces, depending the desired weight and durability. Many bags are lined with pigskin or another thin layer of leather, which usually measures in at around 2 ounces.

Belts 
The standard weight for a sturdy men’s belt is 7-8 ounces.

Wallets and Accessories
Most wallets, notebook covers, and billfolds are made with leather that is 2-4 oz. Heavy accessories like knife sheaths, hard sided cases, and holsters are in the 7-9 oz range.

About Author

I'm just your average guy with an appreciation for above average goods. My goal is to introduce you to products that will see you through thick and thin, and then some.

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Italian leather Shoes Womens
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My son just began a leather working hobby. This is a great article to expand his knowledge. Thanks!

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Jim Ramoz

Great info! Great to learn about these kind of things.

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