In Steel Structural design we often see steel plate thickness in SWG gauge or BWG gauge. However, we need plate thickness in mm or inches for their weight calculation. Below is the table in which plate thickness in mm and inches corresponding to their SWG are shown. Moreover, Weight /Area in kg/m2 and lb/ft2 is also provided in the table, which can be directly used in the calculation.
| Gauge (SWG) | Thickness | Weight Per Area | ||
| inch | mm | lb/ft² | kg/m² | |
| 1 | 0.300 | 7.620 | 12.250 | 59.817 |
| 2 | 0.276 | 7.010 | 11.269 | 55.029 |
| 3 | 0.252 | 6.401 | 10.290 | 50.248 |
| 4 | 0.232 | 5.893 | 9.474 | 46.260 |
| 5 | 0.212 | 5.385 | 8.657 | 42.272 |
| 6 | 0.192 | 4.877 | 7.840 | 38.284 |
| 7 | 0.176 | 4.470 | 7.186 | 35.090 |
| 8 | 0.160 | 4.064 | 6.533 | 31.902 |
| 9 | 0.144 | 3.658 | 5.881 | 28.715 |
| 10 | 0.128 | 3.251 | 5.226 | 25.520 |
| 11 | 0.116 | 2.946 | 4.736 | 23.126 |
| 12 | 0.104 | 2.642 | 4.247 | 20.740 |
| 13 | 0.092 | 2.337 | 3.757 | 18.345 |
| 14 | 0.080 | 2.032 | 3.267 | 15.951 |
| 15 | 0.072 | 1.829 | 2.940 | 14.358 |
| 16 | 0.064 | 1.626 | 2.614 | 12.764 |
| 17 | 0.056 | 1.422 | 2.286 | 11.163 |
| 18 | 0.048 | 1.219 | 1.960 | 9.569 |
| 19 | 0.040 | 1.016 | 1.633 | 7.976 |
| 20 | 0.036 | 0.914 | 1.469 | 7.175 |
| 21 | 0.032 | 0.813 | 1.307 | 6.382 |
| 22 | 0.028 | 0.711 | 1.143 | 5.581 |
| 23 | 0.024 | 0.610 | 0.981 | 4.789 |
| 24 | 0.022 | 0.559 | 0.899 | 4.388 |
| 25 | 0.020 | 0.508 | 0.817 | 3.988 |
| 26 | 0.018 | 0.457 | 0.735 | 3.589 |
| 27 | 0.016 | 0.417 | 0.670 | 3.270 |
| 28 | 0.015 | 0.376 | 0.604 | 2.951 |
| 29 | 0.014 | 0.345 | 0.555 | 2.711 |
| 30 | 0.012 | 0.315 | 0.506 | 2.473 |