# Engineering Handbook/Engineering/Standard Wire Gauge

| Standard Wire Gauge | Diameter | Diameter | Turns of wire | Turns of wire | Cross-sectional area | Cross-sectional area | Res. per length (for copper wire) | Res. per length (for copper wire) | Mass per length | Mass per length | Current Capacity / A | Current Capacity / A |
| Standard Wire Gauge | in | mm | in$^{−1}$ | mm$^{−1}$ | kcmil | mm$^2$ | Ω/km | Ω/kft | lb/ft | kg/m | 750 kcmil/A | 500kcmil/A |
| 000000 (7/0) | 0.500 | 12.7 | 2.00 | 0.0787 | 250 | 127 | 0.136 | 0.447 | 0.759 | 1.13 | 333 | 500 |
| 000000 (6/0) | 0.464 | 11.8 | 2.16 | 0.0848 | 215 | 109 | 0.158 | 0.519 | 0.654 | 0.973 | 287 | 431 |
| 00000 (5/0) | 0.432 | 11.0 | 2.31 | 0.0911 | 187 | 94.6 | 0.182 | 0.598 | 0.567 | 0.844 | 249 | 373 |
| 0000 (4/0) | 0.400 | 10.2 | 2.50 | 0.0984 | 160 | 81.1 | 0.213 | 0.698 | 0.486 | 0.723 | 213 | 320 |
| 000 (3/0) | 0.372 | 9.45 | 2.69 | 0.106 | 138 | 70.1 | 0.246 | 0.807 | 0.420 | 0.625 | 185 | 277 |
| 00 (2/0) | 0.348 | 8.84 | 2.87 | 0.113 | 121 | 61.4 | 0.281 | 0.922 | 0.368 | 0.547 | 161 | 242 |
| 0 (1/0) | 0.324 | 8.23 | 3.09 | 0.122 | 105 | 53.2 | 0.324 | 1.06 | 0.319 | 0.474 | 140 | 210 |
| 1 | 0.300 | 7.62 | 3.33 | 0.131 | 90.0 | 45.6 | 0.378 | 1.24 | 0.273 | 0.407 | 120 | 180 |
| 2 | 0.276 | 7.01 | 3.62 | 0.143 | 76.2 | 38.6 | 0.447 | 1.47 | 0.231 | 0.344 | 102 | 152 |
| 3 | 0.252 | 6.40 | 3.97 | 0.156 | 63.5 | 32.2 | 0.536 | 1.76 | 0.193 | 0.287 | 84.7 | 127 |
| 4 | 0.232 | 5.89 | 4.31 | 0.170 | 53.8 | 27.3 | 0.632 | 2.07 | 0.163 | 0.243 | 71.8 | 108 |
| 5 | 0.212 | 5.38 | 4.72 | 0.186 | 44.9 | 22.8 | 0.757 | 2.48 | 0.137 | 0.203 | 59.9 | 89.9 |
| 6 | 0.192 | 4.88 | 5.21 | 0.205 | 36.9 | 18.7 | 0.923 | 3.03 | 0.112 | 0.167 | 49.2 | 73.7 |
| 7 | 0.176 | 4.47 | 5.68 | 0.224 | 31.0 | 15.7 | 1.10 | 3.60 | 0.0941 | 0.140 | 41.3 | 62.0 |
| 8 | 0.160 | 4.06 | 6.25 | 0.246 | 25.6 | 13.0 | 1.33 | 4.36 | 0.0778 | 0.116 | 34.1 | 51.2 |
| 9 | 0.144 | 3.66 | 6.94 | 0.273 | 20.7 | 10.5 | 1.64 | 5.38 | 0.0630 | 0.0937 | 27.6 | 41.5 |
| 10 | 0.128 | 3.25 | 7.81 | 0.308 | 16.4 | 8.30 | 2.08 | 6.81 | 0.0498 | 0.0741 | 21.8 | 32.8 |
| 11 | 0.116 | 2.95 | 8.62 | 0.339 | 13.5 | 6.82 | 2.53 | 8.30 | 0.0409 | 0.0608 | 17.9 | 26.9 |
| 12 | 0.104 | 2.64 | 9.62 | 0.379 | 10.8 | 5.48 | 3.15 | 10.3 | 0.0329 | 0.0489 | 14.4 | 21.6 |
| 13 | 0.0920 | 2.34 | 10.9 | 0.428 | 8.46 | 4.29 | 4.02 | 13.2 | 0.0257 | 0.0383 | 11.3 | 16.9 |
| 14 | 0.0800 | 2.03 | 12.5 | 0.492 | 6.40 | 3.24 | 5.32 | 17.4 | 0.0194 | 0.0289 | 8.53 | 12.8 |
| 15 | 0.0720 | 1.83 | 13.9 | 0.547 | 5.18 | 2.63 | 6.56 | 21.5 | 0.0157 | 0.0234 | 6.91 | 10.4 |
| 16 | 0.0640 | 1.63 | 15.6 | 0.615 | 4.10 | 2.08 | 8.31 | 27.3 | 0.0124 | 0.0185 | 5.46 | 8.19 |
| 17 | 0.0560 | 1.42 | 17.9 | 0.703 | 3.14 | 1.59 | 10.9 | 35.6 | 0.00952 | 0.0142 | 4.18 | 6.27 |
| 18 | 0.0480 | 1.22 | 20.8 | 0.820 | 2.30 | 1.17 | 14.8 | 48.5 | 0.00700 | 0.0104 | 3.07 | 4.61 |
| 19 | 0.0400 | 1.02 | 25.0 | 0.984 | 1.60 | 0.811 | 21.3 | 69.8 | 0.00486 | 0.00723 | 2.13 | 3.20 |
| 20 | 0.0360 | 0.914 | 27.8 | 1.09 | 1.30 | 0.657 | 26.3 | 86.1 | 0.00394 | 0.00586 | 1.73 | 2.59 |
| 21 | 0.0320 | 0.813 | 31.3 | 1.23 | 1.02 | 0.519 | 33.2 | 109 | 0.00311 | 0.00463 | 1.37 | 2.05 |
| 22 | 0.0280 | 0.711 | 35.7 | 1.41 | 0.784 | 0.397 | 43.4 | 142 | 0.00238 | 0.00354 | 1.05 | 1.57 |
| 23 | 0.0240 | 0.610 | 41.7 | 1.64 | 0.576 | 0.292 | 59.1 | 194 | 0.00175 | 0.00260 | 0.768 | 1.15 |
| 24 | 0.0220 | 0.559 | 45.5 | 1.79 | 0.484 | 0.245 | 70.3 | 231 | 0.00147 | 0.00219 | 0.645 | 0.968 |
| 25 | 0.0200 | 0.508 | 50.0 | 1.97 | 0.400 | 0.203 | 85.1 | 279 | 0.00121 | 0.00181 | 0.533 | 0.800 |
| 26 | 0.0180 | 0.457 | 55.6 | 2.19 | 0.324 | 0.164 | 105 | 345 | 984µ | 0.00146 | 0.432 | 0.648 |
| 27 | 0.0164 | 0.417 | 61.0 | 2.40 | 0.269 | 0.136 | 127 | 415 | 817µ | 0.00122 | 0.359 | 0.538 |
| 28 | 0.0148 | 0.376 | 67.6 | 2.66 | 0.219 | 0.111 | 155 | 510 | 665µ | 990µ | 0.292 | 0.438 |
| 29 | 0.0136 | 0.345 | 73.5 | 2.89 | 0.185 | 0.0937 | 184 | 604 | 562µ | 836µ | 0.247 | 0.370 |
| 30 | 0.0124 | 0.315 | 80.6 | 3.18 | 0.154 | 0.0779 | 221 | 726 | 467µ | 695µ | 0.205 | 0.308 |
| 31 | 0.0116 | 0.295 | 86.2 | 3.39 | 0.135 | 0.0682 | 253 | 830 | 409µ | 608µ | 0.179 | 0.269 |
| 32 | 0.0108 | 0.274 | 92.6 | 3.65 | 0.117 | 0.0591 | 292 | 957 | 354µ | 527µ | 0.156 | 0.233 |
| 33 | 0.0100 | 0.254 | 100 | 3.94 | 0.100 | 0.0507 | 340 | 1120 | 304µ | 452µ | 0.133 | 0.200 |
| 34 | 0.00920 | 0.234 | 109 | 4.28 | 0.0846 | 0.0429 | 402 | 1320 | 257µ | 383µ | 0.113 | 0.169 |
| 35 | 0.00840 | 0.213 | 119 | 4.69 | 0.0706 | 0.0358 | 482 | 1580 | 214µ | 319µ | 0.0941 | 0.141 |
| 36 | 0.00760 | 0.193 | 132 | 5.18 | 0.0578 | 0.0293 | 589 | 1930 | 175µ | 261µ | 0.0770 | 0.116 |
| 37 | 0.00680 | 0.173 | 147 | 5.79 | 0.0462 | 0.0234 | 736 | 2410 | 140µ | 209µ | 0.0617 | 0.0925 |
| 38 | 0.00600 | 0.152 | 167 | 6.56 | 0.0360 | 0.0182 | 945 | 3100 | 109µ | 163µ | 0.0480 | 0.0720 |
| 39 | 0.00520 | 0.132 | 192 | 7.57 | 0.0270 | 0.0137 | 1260 | 4130 | 82.1µ | 122µ | 0.0361 | 0.0541 |
| 40 | 0.00480 | 0.122 | 208 | 8.20 | 0.0230 | 0.0117 | 1480 | 4850 | 70.0µ | 104µ | 0.0307 | 0.0461 |
| 41 | 0.00440 | 0.112 | 227 | 8.95 | 0.0194 | 0.00981 | 1760 | 5770 | 58.8µ | 87.5µ | 0.0258 | 0.0387 |
| 42 | 0.00400 | 0.102 | 250 | 9.84 | 0.0160 | 0.00811 | 2130 | 6980 | 48.6µ | 72.3µ | 0.0213 | 0.0320 |
| 43 | 0.00360 | 0.0914 | 278 | 10.9 | 0.0130 | 0.00657 | 2630 | 8610 | 39.4µ | 58.6µ | 0.0173 | 0.0259 |
| 44 | 0.00320 | 0.0813 | 313 | 12.3 | 0.0102 | 0.00519 | 3320 | 10900 | 31.1µ | 46.3µ | 0.0137 | 0.0205 |
| 45 | 0.00280 | 0.0711 | 357 | 14.1 | 0.00784 | 0.00397 | 4340 | 14200 | 23.8µ | 35.4µ | 0.0105 | 0.0157 |
| 46 | 0.00240 | 0.0610 | 417 | 16.4 | 0.00576 | 0.00292 | 5910 | 19400 | 17.5µ | 26.0µ | 0.00768 | 0.0115 |
| 47 | 0.00200 | 0.0508 | 500 | 19.7 | 0.00400 | 0.00203 | 8510 | 27900 | 12.1µ | 18.1µ | 0.00533 | 0.00800 |
| 48 | 0.00160 | 0.0406 | 625 | 24.6 | 0.00256 | 0.00130 | 13300 | 43600 | 7.78µ | 11.6µ | 0.00341 | 0.00512 |
| 49 | 0.00120 | 0.0305 | 833 | 32.8 | 0.00144 | 730µ | 23600 | 77500 | 4.37µ | 6.51µ | 0.00192 | 0.00288 |
| 50 | 0.00100 | 0.0254 | 1000 | 39.4 | 0.00100 | 507µ | 34000 | 112000 | 3.04µ | 4.52µ | 0.00133 | 0.00200 |
| Notes: | All values are rounded to three significant figures. Values less than 1×10$^{−6}$ are shown with appropriate SI prefixes to avoid a large number of leading zeros. The IACS value of 58.0 MS/m is used as the conductivity of copper. These calculations do not take into account AC effects such as the skin effect - perform suitable calculations before using in a high-frequency application. Grid mains frequencies (50–60 Hz) should not have a noticeable effect, as the skin depth is over 8mm. A density of copper of 8920 kg/m$^3$ is used to derive the mass An allowance of 750 kcmil/A is generally sufficient for calculating current capacity. The more relaxed 500 kcmil/A is an absolute maximum. The values are guidelines − exact values will depend on the type of wire and operating conditions such as ambient temperature, thermal conductivity of the surroundings. | All values are rounded to three significant figures. Values less than 1×10$^{−6}$ are shown with appropriate SI prefixes to avoid a large number of leading zeros. The IACS value of 58.0 MS/m is used as the conductivity of copper. These calculations do not take into account AC effects such as the skin effect - perform suitable calculations before using in a high-frequency application. Grid mains frequencies (50–60 Hz) should not have a noticeable effect, as the skin depth is over 8mm. A density of copper of 8920 kg/m$^3$ is used to derive the mass An allowance of 750 kcmil/A is generally sufficient for calculating current capacity. The more relaxed 500 kcmil/A is an absolute maximum. The values are guidelines − exact values will depend on the type of wire and operating conditions such as ambient temperature, thermal conductivity of the surroundings. | All values are rounded to three significant figures. Values less than 1×10$^{−6}$ are shown with appropriate SI prefixes to avoid a large number of leading zeros. The IACS value of 58.0 MS/m is used as the conductivity of copper. These calculations do not take into account AC effects such as the skin effect - perform suitable calculations before using in a high-frequency application. Grid mains frequencies (50–60 Hz) should not have a noticeable effect, as the skin depth is over 8mm. A density of copper of 8920 kg/m$^3$ is used to derive the mass An allowance of 750 kcmil/A is generally sufficient for calculating current capacity. The more relaxed 500 kcmil/A is an absolute maximum. The values are guidelines − exact values will depend on the type of wire and operating conditions such as ambient temperature, thermal conductivity of the surroundings. | All values are rounded to three significant figures. Values less than 1×10$^{−6}$ are shown with appropriate SI prefixes to avoid a large number of leading zeros. The IACS value of 58.0 MS/m is used as the conductivity of copper. These calculations do not take into account AC effects such as the skin effect - perform suitable calculations before using in a high-frequency application. Grid mains frequencies (50–60 Hz) should not have a noticeable effect, as the skin depth is over 8mm. A density of copper of 8920 kg/m$^3$ is used to derive the mass An allowance of 750 kcmil/A is generally sufficient for calculating current capacity. The more relaxed 500 kcmil/A is an absolute maximum. The values are guidelines − exact values will depend on the type of wire and operating conditions such as ambient temperature, thermal conductivity of the surroundings. | All values are rounded to three significant figures. Values less than 1×10$^{−6}$ are shown with appropriate SI prefixes to avoid a large number of leading zeros. The IACS value of 58.0 MS/m is used as the conductivity of copper. These calculations do not take into account AC effects such as the skin effect - perform suitable calculations before using in a high-frequency application. Grid mains frequencies (50–60 Hz) should not have a noticeable effect, as the skin depth is over 8mm. A density of copper of 8920 kg/m$^3$ is used to derive the mass An allowance of 750 kcmil/A is generally sufficient for calculating current capacity. The more relaxed 500 kcmil/A is an absolute maximum. The values are guidelines − exact values will depend on the type of wire and operating conditions such as ambient temperature, thermal conductivity of the surroundings. | All values are rounded to three significant figures. Values less than 1×10$^{−6}$ are shown with appropriate SI prefixes to avoid a large number of leading zeros. The IACS value of 58.0 MS/m is used as the conductivity of copper. These calculations do not take into account AC effects such as the skin effect - perform suitable calculations before using in a high-frequency application. Grid mains frequencies (50–60 Hz) should not have a noticeable effect, as the skin depth is over 8mm. A density of copper of 8920 kg/m$^3$ is used to derive the mass An allowance of 750 kcmil/A is generally sufficient for calculating current capacity. The more relaxed 500 kcmil/A is an absolute maximum. The values are guidelines − exact values will depend on the type of wire and operating conditions such as ambient temperature, thermal conductivity of the surroundings. | All values are rounded to three significant figures. Values less than 1×10$^{−6}$ are shown with appropriate SI prefixes to avoid a large number of leading zeros. The IACS value of 58.0 MS/m is used as the conductivity of copper. These calculations do not take into account AC effects such as the skin effect - perform suitable calculations before using in a high-frequency application. Grid mains frequencies (50–60 Hz) should not have a noticeable effect, as the skin depth is over 8mm. A density of copper of 8920 kg/m$^3$ is used to derive the mass An allowance of 750 kcmil/A is generally sufficient for calculating current capacity. The more relaxed 500 kcmil/A is an absolute maximum. The values are guidelines − exact values will depend on the type of wire and operating conditions such as ambient temperature, thermal conductivity of the surroundings. | All values are rounded to three significant figures. Values less than 1×10$^{−6}$ are shown with appropriate SI prefixes to avoid a large number of leading zeros. The IACS value of 58.0 MS/m is used as the conductivity of copper. These calculations do not take into account AC effects such as the skin effect - perform suitable calculations before using in a high-frequency application. Grid mains frequencies (50–60 Hz) should not have a noticeable effect, as the skin depth is over 8mm. A density of copper of 8920 kg/m$^3$ is used to derive the mass An allowance of 750 kcmil/A is generally sufficient for calculating current capacity. The more relaxed 500 kcmil/A is an absolute maximum. The values are guidelines − exact values will depend on the type of wire and operating conditions such as ambient temperature, thermal conductivity of the surroundings. | All values are rounded to three significant figures. Values less than 1×10$^{−6}$ are shown with appropriate SI prefixes to avoid a large number of leading zeros. The IACS value of 58.0 MS/m is used as the conductivity of copper. These calculations do not take into account AC effects such as the skin effect - perform suitable calculations before using in a high-frequency application. Grid mains frequencies (50–60 Hz) should not have a noticeable effect, as the skin depth is over 8mm. A density of copper of 8920 kg/m$^3$ is used to derive the mass An allowance of 750 kcmil/A is generally sufficient for calculating current capacity. The more relaxed 500 kcmil/A is an absolute maximum. The values are guidelines − exact values will depend on the type of wire and operating conditions such as ambient temperature, thermal conductivity of the surroundings. | All values are rounded to three significant figures. Values less than 1×10$^{−6}$ are shown with appropriate SI prefixes to avoid a large number of leading zeros. The IACS value of 58.0 MS/m is used as the conductivity of copper. These calculations do not take into account AC effects such as the skin effect - perform suitable calculations before using in a high-frequency application. Grid mains frequencies (50–60 Hz) should not have a noticeable effect, as the skin depth is over 8mm. A density of copper of 8920 kg/m$^3$ is used to derive the mass An allowance of 750 kcmil/A is generally sufficient for calculating current capacity. The more relaxed 500 kcmil/A is an absolute maximum. The values are guidelines − exact values will depend on the type of wire and operating conditions such as ambient temperature, thermal conductivity of the surroundings. | All values are rounded to three significant figures. Values less than 1×10$^{−6}$ are shown with appropriate SI prefixes to avoid a large number of leading zeros. The IACS value of 58.0 MS/m is used as the conductivity of copper. These calculations do not take into account AC effects such as the skin effect - perform suitable calculations before using in a high-frequency application. Grid mains frequencies (50–60 Hz) should not have a noticeable effect, as the skin depth is over 8mm. A density of copper of 8920 kg/m$^3$ is used to derive the mass An allowance of 750 kcmil/A is generally sufficient for calculating current capacity. The more relaxed 500 kcmil/A is an absolute maximum. The values are guidelines − exact values will depend on the type of wire and operating conditions such as ambient temperature, thermal conductivity of the surroundings. | All values are rounded to three significant figures. Values less than 1×10$^{−6}$ are shown with appropriate SI prefixes to avoid a large number of leading zeros. The IACS value of 58.0 MS/m is used as the conductivity of copper. These calculations do not take into account AC effects such as the skin effect - perform suitable calculations before using in a high-frequency application. Grid mains frequencies (50–60 Hz) should not have a noticeable effect, as the skin depth is over 8mm. A density of copper of 8920 kg/m$^3$ is used to derive the mass An allowance of 750 kcmil/A is generally sufficient for calculating current capacity. The more relaxed 500 kcmil/A is an absolute maximum. The values are guidelines − exact values will depend on the type of wire and operating conditions such as ambient temperature, thermal conductivity of the surroundings. |
| This box: view • talk • |||||||||||||