steel thickness conversion table (gauge – inch – mM)
| Gauge No. | B.W.G | U.S.G | Gauge No. | B.W.G | U.S.G | |||||
| inch | mm | inch | mm | inch | mm | inch | mm | |||
| 6 | .203 | 5.156 | .2031 | 5.16 | 21 | .032 | .813 | .0344 | .873 | |
| 7 | .180 | 4.572 | .1875 | 4.76 | 22 | .028 | .711 | .0313 | .794 | |
| 8 | .165 | 4.191 | .1719 | 4.37 | 23 | .025 | .635 | .0281 | .714 | |
| 9 | .148 | 3.759 | .1563 | 3.97 | 24 | .022 | .559 | .0250 | .635 | |
| 10 | .134 | 3.404 | .1406 | 3.57 | 25 | .020 | .508 | .0219 | .556 | |
| 11 | .120 | 3.048 | .1250 | 3.18 | 26 | .018 | .457 | .0188 | .478 | |
| 12 | .109 | 2.769 | .1094 | 2.78 | 27 | .016 | .406 | .0172 | .437 | |
| 13 | .095 | 2.413 | .0938 | 2.38 | 28 | .014 | .356 | .0156 | .396 | |
| 14 | .083 | 2.108 | .0781 | 1.98 | 29 | .013 | .330 | .0141 | .358 | |
| 15 | .072 | 1.829 | .0703 | 1.79 | 30 | .012 | .305 | .0125 | .318 | |
| 16 | .065 | 1.651 | .0625 | 1.59 | 31 | .010 | .254 | .0109 | .277 | |
| 17 | .058 | 1.473 | .0563 | 1.43 | 32 | .009 | .229 | .0102 | .259 | |
| 18 | .049 | 1.245 | .0500 | 1.27 | 33 | .008 | .203 | .0094 | .239 | |
| 19 | .042 | 1.067 | .0438 | 1.11 | 34 | .007 | .178 | .0086 | .218 | |
| 20 | .035 | .889 | .0375 | .953 | 35 | .005 | .127 | .0078 | .198 | |
| BWG – Birmingham Wire Gauge for Iron & Steel Wire USG – US Standard Gauge for Stainless Steel |
Source MEsteel.com