Steel Thickness Conversion Table – Quick Reference
| GAUGE | FRACTION | INCH | MM |
| 0 | 1/2 | 0.5 | 12.7 |
| 0 | 3/8 | 0.375 | 9.525 |
| 3 | 1/4 | 0.25 | 6.35 |
| 7 | 3/16 | 0.1875 | 4.7625 |
| 10 | 9/64 | 0.1406 | 3.571875 |
| 11 | 1/8 | 0.125 | 3.175 |
| 12 | 7/64 | 0.1093 | 2.778125 |
| 14 | 5/64 | 0.078125 | 1.984375 |
| 16 | 1/16 | 0.0625 | 1.5875 |
| 18 | 1/20 | 0.05 | 1.27 |
| 20 | 3/80 | 0.0375 | 0.9525 |
| 22 | 1/32 | 0.03125 | 0.79375 |
* 3/16 and thicker is plate.