One ounce equals 0.4mm (1/64") in thickness.
The thickness of leather varies to some extent throughout the hide. This is why leathers are usually shown with a range of thickness such as 4 to 5 oz., or 6 to 7 oz.
| Ounce |
Milimeter |
Inch |
| 1 |
0.4 |
1/64" |
| 2 |
0.8 |
1/32" |
| 3 |
1.2 |
3/64" |
| 4 |
1.6 |
1/16" |
| 5 |
2 |
5/64" |
| 6 |
2.4 |
3/32" |
| 7 |
2.8 |
7/64" |
| 8 |
3.2 |
1/8" |
| 9 |
3.6 |
9/64" |
| 10 |
4 |
5/32" |
| 11 |
4.4 |
11/64" |
| 12 |
4.8 |
3/16" |
| 13 |
5.2 |
13/64" |
| 14 |
5.6 |
7/32" |
| 15 |
6 |
15/64" |
| 16 |
6.4 |
1/4" |
| 17 |
6.8 |
17/64" |
| 18 |
7.2 |
9/32" |
| 19 |
7.6 |
19/64" |
| 20 |
8 |
5/16" |