AWG gauge table with diameter in millimeters, cross-section in mm² and copper resistance in Ω/km.
| AWG | Diameter (mm) | Area (mm²) | Resistance (copper, 20 °C) (Ω/km) |
|---|---|---|---|
| 4/0 | 11.684 ✓ | 107.2 | 0.1608 |
| 3/0 | 10.404 ✓ | 85.03 | 0.2028 |
| 2/0 | 9.266 ✓ | 67.43 | 0.2557 |
| 1/0 | 8.252 ✓ | 53.48 | 0.3224 |
| 1 | 7.348 ✓ | 42.41 | 0.4066 |
| 2 | 6.543 ✓ | 33.63 | 0.5127 |
| 3 | 5.827 ✓ | 26.67 | 0.6465 |
| 4 | 5.189 ✓ | 21.15 | 0.8152 |
| 5 | 4.62 ✓ | 16.77 | 1.028 |
| 6 | 4.115 ✓ | 13.3 | 1.296 |
| 7 | 3.665 ✓ | 10.55 | 1.634 |
| 8 | 3.264 ✓ | 8.366 | 2.061 |
| 9 | 2.906 ✓ | 6.634 | 2.599 |
| 10 | 2.588 ✓ | 5.261 | 3.277 |
| 11 | 2.304 ✓ | 4.172 | 4.132 |
| 12 | 2.052 ✓ | 3.309 | 5.211 |
| 13 | 1.829 ✓ | 2.624 | 6.571 |
| 14 | 1.628 ✓ | 2.081 | 8.286 |
| 15 | 1.45 ✓ | 1.65 | 10.45 |
| 16 | 1.29 ✓ | 1.309 | 13.17 |
| 17 | 1.151 ✓ | 1.038 | 16.61 |
| 18 | 1.024 ✓ | 0.823 | 20.95 |
| 19 | 0.912 ✓ | 0.6527 | 26.42 |
| 20 | 0.813 ✓ | 0.5176 | 33.31 |
| 21 | 0.724 ✓ | 0.4105 | 42 |
| 22 | 0.643 ✓ | 0.3255 | 52.96 |
| 23 | 0.574 ✓ | 0.2582 | 66.79 |
| 24 | 0.511 ✓ | 0.2047 | 84.22 |
| 25 | 0.455 ✓ | 0.1624 | 106.2 |
| 26 | 0.404 ✓ | 0.1288 | 133.9 |
| 27 | 0.361 ✓ | 0.1021 | 168.9 |
| 28 | 0.32 ✓ | 0.08098 | 212.9 |
| 29 | 0.287 ✓ | 0.06422 | 268.5 |
| 30 | 0.254 ✓ | 0.05093 | 338.6 |
| 31 | 0.226 ✓ | 0.04039 | 426.9 |
| 32 | 0.203 ✓ | 0.03203 | 538.3 |
| 33 | 0.18 ✓ | 0.0254 | 678.8 |
| 34 | 0.16 ✓ | 0.02014 | 856 |
| 35 | 0.142 ✓ | 0.01597 | 1079 |
| 36 | 0.127 ✓ | 0.01267 | 1361 |
| 37 | 0.114 ✓ | 0.01005 | 1716 |
| 38 | 0.102 ✓ | 0.007967 | 2164 |
| 39 | 0.089 ✓ | 0.006318 | 2729 |
| 40 | 0.079 ✓ | 0.00501 | 3441 |
✓ = the diameter matches the standard's formula (ASTM B258). Resistance of standard annealed copper (100 % IACS: ρ = 1/58 Ω·mm²/m, by definition), computed by Simuveliq.
Source: BenchReference physical standards dataset (benchreference.com/data/), CC BY 4.0; values from the standards cited at benchreference.com/sources/. ↗
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