The Leather Bench

Leather Thickness Unit Converter

Convert between ounces, millimetres and inches instantly.

Tool Operation Area

Converts leather thickness between the American ounce scale, millimetres and inches, and suggests typical projects for that weight.

How It Works

  • One ounce of leather thickness equals 1/64 inch, which is 0.396875 mm.
  • So millimetres = ounces x 0.396875, and ounces = millimetres / 0.396875.
  • Inches convert directly at 25.4 mm per inch.
  • The suggested use band is drawn from common workshop practice for each thickness range.
1 oz = 1/64 in = 0.397 mm
|--1oz--|--2oz--|--3oz--|--4oz--|
Schematic diagram of the calculation.

How to Use

  1. 1Enter the number printed on the supplier listing and pick its unit.
  2. 2Read the equivalent values and check the typical-use line against your project.
  3. 3For split leather, measure with a gauge — listings are nominal.

FAQ

Why do suppliers use ounces for thickness?

It is a historic American convention: one ounce per square foot of leather corresponded to 1/64 inch of thickness.

My leather measures thinner than advertised.

Normal. Hides vary by up to half an ounce across a single panel.

What thickness for a wallet?

1.2-1.6 mm (3-4 oz) for exteriors, 0.8-1.0 mm for card slots.

Can I glue two thin pieces instead of one thick one?

Yes, and laminated panels are often more stable than a single thick piece.

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