We’re often asked about leather thickness and leather weights. The thickness of leather is generally measured using weight per square foot. So for a 7oz leather, your thickness would be a little over .1” (0.1094). To calculate this, simply divide your weight in ounces by 64. Example, 7 ounces / 64 = 0.1094.
And if you need to quickly convert leather weight to thickness, just use the calculator below. *Regarding the irons measurement, the “iron” is an old standard to measure the thickness of leather. It can still be found in use in the shoe industry. One iron equals 1/48th of a inch.
And as a last resort, reference the leather thickness chart below. Since leather is usually talked about in even numbers, there’s a very likely chance what you’re looking for is in this table:
| Ounces | Inches | Inches | Millimeters | Irons | Mils |
|---|---|---|---|---|---|
| 1 oz | 1/64 | 0.0156 | 0.3969 | 0.750 | 15.625 |
| 2 oz | 1/32 | 0.0313 | 0.7938 | 1.500 | 31.250 |
| 3 oz | 3/64 | 0.0469 | 1.1906 | 2.250 | 46.875 |
| 4 oz | 1/16 | 0.0625 | 1.5875 | 3.000 | 62.500 |
| 5 oz | 5/64 | 0.0781 | 1.9844 | 3.750 | 78.125 |
| 6 oz | 3/32 | 0.0938 | 2.3813 | 4.500 | 93.750 |
| 7 oz | 7/64 | 0.1094 | 2.7781 | 5.250 | 109.375 |
| 8 oz | 1/8 | 0.1250 | 3.1750 | 6.000 | 125.000 |
| 9 oz | 9/64 | 0.1406 | 3.5719 | 6.750 | 140.625 |
| 10 oz | 5/32 | 0.1563 | 3.9688 | 7.500 | 156.250 |
| 11 oz | 11/64 | 0.1719 | 4.3656 | 8.250 | 171.875 |
| 12 oz | 3/16 | 0.1875 | 4.7625 | 9.000 | 187.500 |
| 13 oz | 13/64 | 0.2031 | 5.1594 | 9.750 | 203.125 |
| 14 oz | 7/32 | 0.2188 | 5.5563 | 10.500 | 218.750 |
| 15 oz | 15/64 | 0.2344 | 5.9531 | 11.250 | 234.375 |
| 16 oz | 1/4 | 0.2500 | 6.3500 | 12.000 | 250.000 |
| 17 oz | 17/64 | 0.2656 | 6.7469 | 12.750 | 265.625 |
| 18 oz | 9/32 | 0.2813 | 7.1438 | 13.500 | 281.250 |
| 19 oz | 19/64 | 0.2969 | 7.5406 | 14.250 | 296.875 |
| 20 oz | 5/16 | 0.3125 | 7.9375 | 15.000 | 312.500 |
