Leather Thickness Guide: Ounces, mm, and Inches

Thickness determines how a hide cuts, folds, and performs — here is how it is measured and adjusted at the tannery.

By United Leather Editorial, Editorial Team · August 30, 2026 · 3 min read

Leather thickness is measured in ounces, where one ounce equals 1/64 inch, or approximately 0.4 mm. A tannery brings a hide to a target thickness through splitting, which slices the hide horizontally into layers, and shaving, which removes fine amounts of material from the flesh side to even it out. The number you see on a spec sheet is the finished thickness after these processes, not the raw thickness of the animal skin.

Why raw hides need processing

An animal skin is naturally uneven: the back and butt are thick and dense, while the belly and shank are thin and looser in fiber structure. Left unprocessed, a single hide could vary by several ounces from one edge to the other. Splitting separates a thick hide into a top grain layer and one or more split layers underneath, letting a tannery sell a single raw hide as multiple thickness-appropriate products. Shaving then fine-tunes the top layer to hit an exact ounce target for consistency across the run.

Ounce, inch, and millimeter conversion

| Ounces | Inches (fraction) | Inches (decimal) | Millimeters | |---|---|---|---| | 1 oz | 1/64 in | 0.016 in | 0.4 mm | | 2 oz | 2/64 in | 0.031 in | 0.8 mm | | 3 oz | 3/64 in | 0.047 in | 1.2 mm | | 4 oz | 4/64 in | 0.063 in | 1.6 mm | | 5 oz | 5/64 in | 0.078 in | 2.0 mm | | 6 oz | 6/64 in | 0.094 in | 2.4 mm | | 7 oz | 7/64 in | 0.109 in | 2.8 mm | | 8 oz | 8/64 in | 0.125 in | 3.2 mm | | 10 oz | 10/64 in | 0.156 in | 4.0 mm |

How thickness affects making decisions

Thin leather (1-3 oz) folds cleanly, gathers, and is easy to feed through a domestic sewing machine, which is why it dominates garment and lining use. As thickness climbs past 5 oz, edges become thick enough to skive, burnish, or bevel as a visible design feature, which is standard on belts and structured bag panels. Beyond 8-10 oz, leather is generally cut with a strap cutter or clicker press rather than shears, and stitching typically calls for a walking-foot or heavy-duty machine.

Thickness and temper are related but distinct: two hides at the same ounce weight can feel very different depending on tannage and how firm or soft the fiber structure is left. See our leather temper guide for that half of the equation.

Thickness by product recommendation

For thin, foldable work, Plongé Lightweight Cowhide and Pearlized Lambskin sit in the lighter ounce ranges. For mid-thickness handbag and footwear panels, Atlas Full Grain Cowhide and Monte Carlo Natural Grain Cowhide offer the substance needed for structured pieces. For heavier strap and belt work where a beveled edge matters, Lorenzo Veg-Tanned Firm Cowhide and Sorrento Veg-Tanned Natural Cowhide are cut at firmer, thicker specs. For suede applications that need moderate body, Calf Suede holds a consistent nap-friendly thickness.

Related guides

For the difference between ounce weight and firmness, read our leather temper guide. For product-level weight recommendations, see our leather weight guide and the interactive leather weights guide chart. Shop by thickness category in our lightweight leather and heavyweight leather collections.

Measuring thickness yourself

If you want to verify a hide's thickness before cutting, a dial or digital leather thickness gauge gives the most accurate reading in millimeters, which you can then cross-check against the ounce conversion table above. Calipers are a reasonable substitute if a dedicated gauge is not available, though they compress soft leather more than a purpose-built gauge and can under-read slightly on soft-tempered pieces. Always take several readings across a hide — near the shoulder, the center, and toward the belly — rather than relying on a single spot check, since thickness is rarely perfectly uniform even within a tightly graded piece.

Order swatches before you cut

Because a single hide can vary in thickness across its surface, order swatches from our leather hides and check the specific area you plan to cut from before committing a full skin to a pattern.