Every 3 gauges the area halves and the resistance doubles; every 6 gauges the diameter halves. Values are for solid copper at 20 °C.
| AWG | Diameter (in) | Diameter (mm) | Area (mm²) | Circular mils | Ω / 1,000 ft | Ω / km |
|---|---|---|---|---|---|---|
| 4/0 AWG | 0.4600 | 11.684 | 107.22 | 211,600 | 0.0490 | 0.161 |
| 3/0 AWG | 0.4096 | 10.405 | 85.03 | 167,806 | 0.0618 | 0.203 |
| 2/0 AWG | 0.3648 | 9.266 | 67.43 | 133,077 | 0.0779 | 0.256 |
| 1/0 AWG | 0.3249 | 8.251 | 53.48 | 105,535 | 0.0983 | 0.322 |
| 1 AWG | 0.2893 | 7.348 | 42.41 | 83,693 | 0.1239 | 0.407 |
| 2 AWG | 0.2576 | 6.544 | 33.63 | 66,371 | 0.1563 | 0.513 |
| 3 AWG | 0.2294 | 5.827 | 26.67 | 52,635 | 0.1970 | 0.646 |
| 4 AWG | 0.2043 | 5.189 | 21.15 | 41,741 | 0.2485 | 0.815 |
| 5 AWG | 0.1819 | 4.621 | 16.77 | 33,102 | 0.3133 | 1.028 |
| 6 AWG | 0.1620 | 4.115 | 13.30 | 26,251 | 0.3951 | 1.296 |
| 7 AWG | 0.1443 | 3.665 | 10.55 | 20,818 | 0.4982 | 1.634 |
| 8 AWG | 0.1285 | 3.264 | 8.37 | 16,510 | 0.6282 | 2.061 |
| 9 AWG | 0.1144 | 2.906 | 6.63 | 13,093 | 0.7921 | 2.599 |
| 10 AWG | 0.1019 | 2.588 | 5.26 | 10,383 | 0.9988 | 3.277 |
| 11 AWG | 0.0907 | 2.305 | 4.17 | 8,234 | 1.260 | 4.132 |
| 12 AWG | 0.0808 | 2.053 | 3.31 | 6,530 | 1.588 | 5.211 |
| 13 AWG | 0.0720 | 1.828 | 2.62 | 5,178 | 2.003 | 6.571 |
| 14 AWG | 0.0641 | 1.628 | 2.08 | 4,107 | 2.525 | 8.285 |
| 15 AWG | 0.0571 | 1.450 | 1.65 | 3,257 | 3.184 | 10.45 |
| 16 AWG | 0.0508 | 1.291 | 1.31 | 2,583 | 4.015 | 13.17 |
| 17 AWG | 0.0453 | 1.150 | 1.04 | 2,048 | 5.063 | 16.61 |
| 18 AWG | 0.0403 | 1.024 | 0.823 | 1,624 | 6.385 | 20.95 |
| 19 AWG | 0.0359 | 0.912 | 0.653 | 1,288 | 8.051 | 26.41 |
| 20 AWG | 0.0320 | 0.812 | 0.518 | 1,022 | 10.152 | 33.31 |
| 21 AWG | 0.0285 | 0.723 | 0.410 | 810 | 12.802 | 42.00 |
| 22 AWG | 0.0253 | 0.644 | 0.326 | 642 | 16.143 | 52.96 |
| 23 AWG | 0.0226 | 0.573 | 0.258 | 509 | 20.356 | 66.78 |
| 24 AWG | 0.0201 | 0.511 | 0.205 | 404 | 25.668 | 84.21 |
| 25 AWG | 0.0179 | 0.455 | 0.162 | 320 | 32.367 | 106.19 |
| 26 AWG | 0.0159 | 0.405 | 0.129 | 254 | 40.814 | 133.90 |
| 27 AWG | 0.0142 | 0.361 | 0.102 | 202 | 51.466 | 168.85 |
| 28 AWG | 0.0126 | 0.321 | 0.081 | 160 | 64.897 | 212.92 |
| 29 AWG | 0.0113 | 0.286 | 0.064 | 127 | 81.833 | 268.48 |
| 30 AWG | 0.0100 | 0.255 | 0.051 | 101 | 103.190 | 338.55 |
Diameter d = 0.127 mm × 92^((36 − n) ÷ 39). Stranded wire has a slightly larger outside diameter for the same gauge.
For estimating and educational purposes only. Results are approximate and are not a substitute for a licensed professional, the manufacturer's instructions or your local code. Disclaimer
Metric cable is sold by cross-section in mm². The closest equivalents are 14 AWG ≈ 2.5 mm², 12 AWG ≈ 4 mm², 10 AWG ≈ 6 mm², 8 AWG ≈ 10 mm² and 6 AWG ≈ 16 mm² (always round up to the larger metric size).
2.05 mm (0.0808 in) for solid copper.
No. Higher AWG numbers are thinner: 10 AWG is thicker than 14 AWG.
