Reference / Conductor Resistance
Quick reference · Grade G
Conductor Resistance
DC resistance of solid-equivalent copper and aluminum conductors at 20, 75 and 90 °C, with conductor mass per length.
Copper (annealed, 100% IACS) 30 sizes
| Size | Ω/km @ 20 °C | Ω/km @ 75 °C | Ω/km @ 90 °C | Ω/1000 ft @ 20 °C | Ω/1000 ft @ 75 °C | Ω/1000 ft @ 90 °C | kg/km |
|---|---|---|---|---|---|---|---|
| 18 AWG | 20.95 | 25.48 | 26.71 | 6.385 | 7.765 | 8.142 | 7.3 |
| 16 AWG | 13.17 | 16.02 | 16.80 | 4.016 | 4.884 | 5.120 | 11.6 |
| 14 AWG | 8.286 | 10.08 | 10.56 | 2.525 | 3.071 | 3.220 | 18.5 |
| 12 AWG | 5.211 | 6.337 | 6.644 | 1.588 | 1.932 | 2.025 | 29.4 |
| 10 AWG | 3.277 | 3.985 | 4.179 | 0.9989 | 1.215 | 1.274 | 46.8 |
| 8 AWG | 2.061 | 2.506 | 2.628 | 0.6282 | 0.7640 | 0.8010 | 74.4 |
| 6 AWG | 1.296 | 1.576 | 1.653 | 0.3951 | 0.4805 | 0.5038 | 118.3 |
| 4 AWG | 0.8152 | 0.9914 | 1.039 | 0.2485 | 0.3022 | 0.3168 | 188.0 |
| 3 AWG | 0.6465 | 0.7862 | 0.8243 | 0.1970 | 0.2396 | 0.2512 | 237.1 |
| 2 AWG | 0.5127 | 0.6235 | 0.6537 | 0.1563 | 0.1900 | 0.1992 | 299.0 |
| 1 AWG | 0.4066 | 0.4944 | 0.5184 | 0.1239 | 0.1507 | 0.1580 | 377.0 |
| 1/0 AWG | 0.3224 | 0.3921 | 0.4111 | 0.09827 | 0.1195 | 0.1253 | 475.4 |
| 2/0 AWG | 0.2557 | 0.3110 | 0.3260 | 0.07793 | 0.09478 | 0.09937 | 599.5 |
| 3/0 AWG | 0.2028 | 0.2466 | 0.2586 | 0.06180 | 0.07516 | 0.07881 | 755.9 |
| 4/0 AWG | 0.1608 | 0.1956 | 0.2050 | 0.04901 | 0.05961 | 0.06250 | 953.2 |
| 250 kcmil | 0.1361 | 0.1655 | 0.1735 | 0.04148 | 0.05045 | 0.05290 | 1126.2 |
| 300 kcmil | 0.1134 | 0.1379 | 0.1446 | 0.03457 | 0.04204 | 0.04408 | 1351.4 |
| 350 kcmil | 0.09722 | 0.1182 | 0.1240 | 0.02963 | 0.03604 | 0.03778 | 1576.6 |
| 400 kcmil | 0.08507 | 0.1035 | 0.1085 | 0.02593 | 0.03153 | 0.03306 | 1801.9 |
| 500 kcmil | 0.06805 | 0.08276 | 0.08677 | 0.02074 | 0.02523 | 0.02645 | 2252.3 |
| 600 kcmil | 0.05671 | 0.06897 | 0.07231 | 0.01729 | 0.02102 | 0.02204 | 2702.8 |
| 700 kcmil | 0.04861 | 0.05912 | 0.06198 | 0.01482 | 0.01802 | 0.01889 | 3153.2 |
| 750 kcmil | 0.04537 | 0.05517 | 0.05785 | 0.01383 | 0.01682 | 0.01763 | 3378.5 |
| 800 kcmil | 0.04253 | 0.05173 | 0.05423 | 0.01296 | 0.01577 | 0.01653 | 3603.7 |
| 900 kcmil | 0.03781 | 0.04598 | 0.04821 | 0.01152 | 0.01401 | 0.01469 | 4054.2 |
| 1000 kcmil | 0.03403 | 0.04138 | 0.04339 | 0.01037 | 0.01261 | 0.01322 | 4504.6 |
| 1250 kcmil | 0.02722 | 0.03310 | 0.03471 | 0.00830 | 0.01009 | 0.01058 | 5630.8 |
| 1500 kcmil | 0.02268 | 0.02759 | 0.02892 | 0.00691 | 0.00841 | 0.00882 | 6756.9 |
| 1750 kcmil | 0.01944 | 0.02365 | 0.02479 | 0.00593 | 0.00721 | 0.00756 | 7883.1 |
| 2000 kcmil | 0.01701 | 0.02069 | 0.02169 | 0.00519 | 0.00631 | 0.00661 | 9009.3 |
Aluminum (1350, 61% IACS) 29 sizes
| Size | Ω/km @ 20 °C | Ω/km @ 75 °C | Ω/km @ 90 °C | Ω/1000 ft @ 20 °C | Ω/1000 ft @ 75 °C | Ω/1000 ft @ 90 °C | kg/km |
|---|---|---|---|---|---|---|---|
| 16 AWG | 21.60 | 26.38 | 27.69 | 6.583 | 8.042 | 8.440 | 3.5 |
| 14 AWG | 13.58 | 16.59 | 17.41 | 4.140 | 5.058 | 5.308 | 5.6 |
| 12 AWG | 8.542 | 10.44 | 10.95 | 2.604 | 3.181 | 3.338 | 9.0 |
| 10 AWG | 5.372 | 6.563 | 6.888 | 1.637 | 2.000 | 2.099 | 14.2 |
| 8 AWG | 3.379 | 4.128 | 4.332 | 1.030 | 1.258 | 1.320 | 22.6 |
| 6 AWG | 2.125 | 2.596 | 2.724 | 0.6477 | 0.7912 | 0.8304 | 36.0 |
| 4 AWG | 1.336 | 1.633 | 1.713 | 0.4073 | 0.4976 | 0.5222 | 57.2 |
| 3 AWG | 1.060 | 1.295 | 1.359 | 0.3230 | 0.3946 | 0.4141 | 72.1 |
| 2 AWG | 0.8404 | 1.027 | 1.078 | 0.2562 | 0.3129 | 0.3284 | 91.0 |
| 1 AWG | 0.6665 | 0.8142 | 0.8545 | 0.2031 | 0.2482 | 0.2605 | 114.7 |
| 1/0 AWG | 0.5286 | 0.6457 | 0.6777 | 0.1611 | 0.1968 | 0.2066 | 144.7 |
| 2/0 AWG | 0.4192 | 0.5121 | 0.5374 | 0.1278 | 0.1561 | 0.1638 | 182.4 |
| 3/0 AWG | 0.3324 | 0.4061 | 0.4262 | 0.1013 | 0.1238 | 0.1299 | 230.0 |
| 4/0 AWG | 0.2636 | 0.3220 | 0.3380 | 0.08035 | 0.09816 | 0.1030 | 290.0 |
| 250 kcmil | 0.2231 | 0.2726 | 0.2861 | 0.06801 | 0.08308 | 0.08719 | 342.7 |
| 300 kcmil | 0.1859 | 0.2271 | 0.2384 | 0.05667 | 0.06923 | 0.07266 | 411.2 |
| 350 kcmil | 0.1594 | 0.1947 | 0.2043 | 0.04858 | 0.05934 | 0.06228 | 479.7 |
| 400 kcmil | 0.1395 | 0.1704 | 0.1788 | 0.04250 | 0.05193 | 0.05450 | 548.3 |
| 500 kcmil | 0.1116 | 0.1363 | 0.1430 | 0.03400 | 0.04154 | 0.04360 | 685.3 |
| 600 kcmil | 0.09297 | 0.1136 | 0.1192 | 0.02834 | 0.03462 | 0.03633 | 822.4 |
| 700 kcmil | 0.07969 | 0.09735 | 0.1022 | 0.02429 | 0.02967 | 0.03114 | 959.5 |
| 750 kcmil | 0.07437 | 0.09086 | 0.09536 | 0.02267 | 0.02769 | 0.02906 | 1028.0 |
| 800 kcmil | 0.06973 | 0.08518 | 0.08940 | 0.02125 | 0.02596 | 0.02725 | 1096.5 |
| 900 kcmil | 0.06198 | 0.07572 | 0.07946 | 0.01889 | 0.02308 | 0.02422 | 1233.6 |
| 1000 kcmil | 0.05578 | 0.06814 | 0.07152 | 0.01700 | 0.02077 | 0.02180 | 1370.6 |
| 1250 kcmil | 0.04462 | 0.05452 | 0.05721 | 0.01360 | 0.01662 | 0.01744 | 1713.3 |
| 1500 kcmil | 0.03719 | 0.04543 | 0.04768 | 0.01133 | 0.01385 | 0.01453 | 2056.0 |
| 1750 kcmil | 0.03187 | 0.03894 | 0.04087 | 0.00972 | 0.01187 | 0.01246 | 2398.6 |
| 2000 kcmil | 0.02789 | 0.03407 | 0.03576 | 0.00850 | 0.01039 | 0.01090 | 2741.3 |
Computed from IACS resistivity (IEC 60028) and the AWG geometric definition. © RokBench.