| Standard Wire Gauge | Diameter | |
| inches | mm | |
| 7/0 | 0.5 | 12.7 |
| 6/0 | 0.46 | 11.79 |
| 5/0 | 0.43 | 10.97 |
| 4/0 | 0.40 | 10.16 |
| 3/0 | 0.37 | 9.45 |
| 2/0 | 0.35 | 8.84 |
| 1/0 | 0.32 | 8.24 |
| 1 | 0.30 | 7.62 |
| 2 | 0.28 | 7.01 |
| 3 | 0.25 | 6.40 |
| 4 | 0.23 | 5.89 |
| 5 | 0.21 | 5.39 |
| 6 | 0.19 | 4.88 |
| 7 | 0.18 | 4.47 |
| 8 | 0.16 | 4.06 |
| 9 | 0.14 | 3.66 |
| 10 | 0.13 | 3.25 |
| 11 | 0.12 | 2.95 |
| 12 | 0.10 | 2.64 |
| 13 | 0.09 | 2.34 |
| 14 | 0.08 | 2.03 |
| 15 | 0.07 | 1.83 |
| 16 | 0.06 | 1.63 |
| 17 | 0.06 | 1.42 |
| 18 | 0.05 | 1.22 |
| 19 | 0.04 | 1.02 |
| 20 | 0.04 | 0.91 |