Leather Thickness and Conversion Chart

How is leather thickness measured?

Leather thickness is typically measured in ounces. This unit of measurement does not convey weight in the colloquial sense, but rather the thickness. And since it is critical to have the necessary thickness of leather for a particular project, it is therefore also critical to know ounce measurements.

A device used to measure ounce thickness.
So how thick is each ounce of leather?

An ounce of leather equals 1/64 of an inch. So, 9 ounces are equal to 9/64 of an inch and so on. To help out even further, here is a leather thickness chart for quick and easy conversions. Bear in mind, a piece of leather will have slightly variable thickness, so our chart reflects that.

Ounce Thickness Inch Thickness Millimeter Thickness
2 – 3 oz 1/32 – 3/64 in .8 – 1.2 mm
3 – 4 oz 3/64 – 1/16 1.2 – 1.6 mm
4 – 5 oz 1/16 – 5/64 in 1.6 – 2.0 mm
5 – 6 oz 5/64 – 3/32 in 2.0 – 2.4 mm
6 – 7 oz 3/32 – 7/64 in 2.4 – 2.8 mm
7 – 8 oz 7/64 – 1/8 in 2.8 – 3.2 mm
8 – 9 oz 1/8 – 9/64 in 3.2 – 3.6 mm
9 – 10 oz 9/64 – 5/32 in 3.6 – 4.0 mm
10 – 11 oz 5/32 – 11/64 in 4.0 – 4.4 mm
So what thickness of leather do I need?

As mentioned before, it is essential that you get the right thickness of leather for your project. Some variance is allowed for personal taste, but the chart below is a good guide to give you an idea of what you may need.

Ounce Thickness Common Projects
2 – 3 oz lining, embossing
3 – 4 oz lining, embossing, light bags, light wallets
4 – 5 oz wallets, bags, chaps
5 – 6 oz phone and tablet cases, book covers, light moccasins, chaps
6 – 7 oz heavy cases, covers, chaps, moccasins
7 – 8 oz moccasins, light sheaths, light holsters, belts
8 – 9 oz standard belts, standard sheaths, straps, medium holsters
9 – 10 oz heavy holsters, heavy belts, light armor
10 – 11 oz heavy straps, medium armor