This chart prescribes standard nominal diameters and cross-sectional areas of American Wire Gauge (AWG) sizes of solid round wires, used as electrical conductors.
Unlike many other charts you can find on the Internet, the chart on this page contains completely reliable values, as it is fully compliant with ASTM B258-18.
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| Size | Diameter | Cross-sectional area | Resistance for copper wire | ||||
| AWG | mils | mm | inches | cmils | mm2 | Ω/1000 ft | Ω/km |
| 4/0 | 460 | 11.68 | 0.46 | 211 600 | 107.2 | 0.0490 | 0.1608 |
| 3/0 | 409.6 | 10.4 | 0.4096 | 167 800 | 85.01 | 0.0618 | 0.2028 |
| 2/0 | 364.8 | 9.266 | 0.3648 | 133 100 | 67.43 | 0.0779 | 0.2556 |
| 1/0 | 324.9 | 8.252 | 0.3249 | 105 600 | 53.49 | 0.0983 | 0.3225 |
| 1 | 289.3 | 7.348 | 0.2893 | 83 690 | 42.41 | 0.1239 | 0.4065 |
| 2 | 257.6 | 6.543 | 0.2576 | 66 360 | 33.62 | 0.1563 | 0.5128 |
| 3 | 229.4 | 5.827 | 0.2294 | 52 620 | 26.66 | 0.1971 | 0.6467 |
| 4 | 204.3 | 5.189 | 0.2043 | 41 740 | 21.15 | 0.2485 | 0.8153 |
| 5 | 181.9 | 4.62 | 0.1819 | 33 090 | 16.77 | 0.3135 | 1.0285 |
| 6 | 162 | 4.115 | 0.162 | 26 240 | 13.3 | 0.3952 | 1.2966 |
| 7 | 144.3 | 3.665 | 0.1443 | 20 820 | 10.55 | 0.4981 | 1.6342 |
| 8 | 128.5 | 3.264 | 0.1285 | 16 510 | 8.367 | 0.6281 | 2.0607 |
| 9 | 114.4 | 2.906 | 0.1144 | 13 090 | 6.631 | 0.7925 | 2.6001 |
| 10 | 101.9 | 2.588 | 0.1019 | 10 380 | 5.261 | 0.9988 | 3.2769 |
| 11 | 90.7 | 2.304 | 0.0907 | 8 230 | 4.168 | 1.2607 | 4.1362 |
| 12 | 80.8 | 2.052 | 0.0808 | 6 530 | 3.308 | 1.5886 | 5.2119 |
| 13 | 72 | 1.829 | 0.072 | 5 180 | 2.627 | 2.0007 | 6.5640 |
| 14 | 64.1 | 1.628 | 0.0641 | 4 110 | 2.082 | 2.5242 | 8.2815 |
| 15 | 57.1 | 1.45 | 0.0571 | 3 260 | 1.652 | 3.1810 | 10.4364 |
| 16 | 50.8 | 1.29 | 0.0508 | 2 580 | 1.308 | 4.0190 | 13.1857 |
| 17 | 45.3 | 1.151 | 0.0453 | 2 050 | 1.04 | 5.0541 | 16.5817 |
| 18 | 40.3 | 1.024 | 0.0403 | 1 620 | 0.823 | 6.3860 | 20.9514 |
| 19 | 35.9 | 0.912 | 0.0359 | 1 290 | 0.653 | 8.0473 | 26.4019 |
| 20 | 32 | 0.813 | 0.032 | 1 020 | 0.519 | 10.1284 | 33.2297 |
| 21 | 28.5 | 0.724 | 0.0285 | 812 | 0.412 | 12.7688 | 41.8924 |
| 22 | 25.3 | 0.643 | 0.0253 | 640 | 0.324 | 16.2031 | 53.1598 |
| 23 | 22.6 | 0.574 | 0.0226 | 511 | 0.259 | 20.3059 | 66.6204 |
| 24 | 20.1 | 0.511 | 0.0201 | 404 | 0.205 | 25.6713 | 84.2234 |
| 25 | 17.9 | 0.455 | 0.0179 | 320 | 0.162 | 32.3694 | 106.1988 |
| 26 | 15.9 | 0.404 | 0.0159 | 253 | 0.128 | 41.0247 | 134.5955 |
| 27 | 14.2 | 0.361 | 0.0142 | 202 | 0.102 | 51.4356 | 168.7520 |
| 28 | 12.6 | 0.32 | 0.0126 | 159 | 0.0804 | 65.3279 | 214.3304 |
| 29 | 11.3 | 0.287 | 0.0113 | 128 | 0.0647 | 81.2238 | 266.4823 |
| 30 | 10 | 0.254 | 0.01 | 100 | 0.0507 | 103.7146 | 340.2710 |
| 31 | 8.9 | 0.226 | 0.0089 | 79.2 | 0.0401 | 130.9363 | 429.5811 |
| 32 | 8 | 0.203 | 0.008 | 64 | 0.0324 | 162.0541 | 531.6736 |
| 33 | 7.1 | 0.18 | 0.0071 | 50.4 | 0.0255 | 205.7422 | 675.0072 |
| 34 | 6.3 | 0.16 | 0.0063 | 39.7 | 0.0201 | 261.3118 | 857.3222 |
| 35 | 5.6 | 0.142 | 0.0056 | 31.4 | 0.0159 | 330.7227 | 1085.0483 |
| 36 | 5 | 0.127 | 0.005 | 25 | 0.0127 | 414.8586 | 1361.0847 |
| 37 | 4.5 | 0.114 | 0.0045 | 20.2 | 0.0103 | 512.1711 | 1680.3514 |
| 38 | 4 | 0.102 | 0.004 | 16 | 0.00811 | 648.2165 | 2126.6946 |
| 39 | 3.5 | 0.0889 | 0.0035 | 12.2 | 0.00621 | 846.6502 | 2777.7238 |
| 40 | 3.1 | 0.0787 | 0.0031 | 9.61 | 0.00487 | 1079.2367 | 3540.8029 |
| 41 | 2.8 | 0.0711 | 0.0028 | 7.84 | 0.00397 | 1322.8909 | 4340.1934 |
| 42 | 2.5 | 0.0635 | 0.0025 | 6.25 | 0.00317 | 1659.4343 | 5444.3384 |
| 43 | 2.2 | 0.0559 | 0.0022 | 4.84 | 0.00245 | 2142.8646 | 7030.3959 |
| 44 | 2 | 0.0508 | 0.002 | 4 | 0.00203 | 2592.8661 | 8506.7788 |
| 45 | 1.76 | 0.0447 | 0.0018 | 3.1 | 0.00157 | 3348.2259 | 10984.9935 |
