Standard wire gauge (SWG) and thickness conversion tables in inches and millimeters.
| Gauge No. | Standard Wire Gauge (in.) | Standard Wire Gauge (mm) | Birmingham Gauge (in.) | Birmingham Gauge (mm) |
|---|---|---|---|---|
| 15/0 | - | - | 1.000 | 25.4 |
| 14/0 | - | - | 0.9583 | 24.34 |
| 13/0 | - | - | 0.9167 | 23.28 |
| 12/0 | - | - | 0.8750 | 22.22 |
| 11/0 | - | - | 0.8333 | 21.17 |
| 10/0 | - | - | 0.7917 | 20.11 |
| 9/0 | - | - | 0.750 | 19.05 |
| 8/0 | - | - | 0.7083 | 17.99 |
| 7/0 | 0.500 | 12.700 | 0.6666 | 16.93 |
| 6/0 | 0.464 | 11.786 | 0.625 | 15.88 |
| 5/0 | 0.432 | 10.973 | 0.5883 | 14.94 |
| 4/0 | 0.400 | 10.160 | 0.5416 | 13.76 |
| 3/0 | 0.372 | 9.449 | 0.500 | 12.70 |
| 2/0 | 0.348 | 8.839 | 0.4452 | 11.31 |
| 0 | 0.324 | 8.230 | 0.3964 | 10.07 |
| 1 | 0.300 | 7.620 | 0.3532 | 8.971 |
| 2 | 0.276 | 7.010 | 0.3147 | 7.993 |
| 3 | 0.252 | 6.401 | 0.2804 | 7.122 |
| 4 | 0.232 | 5.893 | 0.250 | 6.350 |
| 5 | 0.212 | 5.385 | 0.2225 | 5.652 |
| 6 | 0.192 | 4.877 | 0.1981 | 5.032 |
| 7 | 0.716 | 4.470 | 0.1764 | 4.481 |
| 8 | 0.160 | 4.064 | 0.1570 | 3.988 |
| 9 | 0.144 | 3.658 | 0.1398 | 3.551 |
| 10 | 0.128 | 3.251 | 0.1250 | 3.175 |
| 11 | 0.116 | 2.946 | 0.1113 | 2.827 |
| 12 | 0.104 | 2.642 | 0.0991 | 2.517 |
| 13 | 0.092 | 2.337 | 0.0882 | 2.250 |
| 14 | 0.080 | 2.032 | 0.0785 | 1.994 |
| 15 | 0.072 | 1.829 | 0.0699 | 1.775 |
| 16 | 0.064 | 1.626 | 0.0625 | 1.588 |
| 17 | 0.056 | 1.422 | 0.0556 | 1.412 |
| 18 | 0.048 | 1.219 | 0.0495 | 1.257 |
| 19 | 0.040 | 1.016 | 0.0440 | 1.118 |
| 20 | 0.036 | 0.914 | 0.0392 | 0.9957 |
| 21 | 0.032 | 0.813 | 0.0349 | 0.08865 |
| 22 | 0.028 | 0.711 | 0.03125 | 0.7938 |
| 23 | 0.024 | 0.610 | 0.02782 | 0.7066 |
| 24 | 0.022 | 0.559 | 0.02476 | 0.6289 |
| 25 | 0.020 | 0.508 | 0.02204 | 0.5599 |
| 26 | 0.018 | 0.457 | 0.01961 | 0.4981 |
| 27 | 0.0164 | 0.4166 | 0.01745 | 0.4432 |
| 28 | 0.0148 | 0.3579 | 0.015625 | 0.3969 |
| 29 | 0.0136 | 0.3454 | 0.0139 | 0.3531 |
| 30 | 0.0124 | 0.3150 | 0.0123 | 0.3124 |
| 31 | 0.0116 | 0.2946 | 0.0110 | 0.2794 |
| 32 | 0.0108 | 0.2743 | 0.0098 | 0.2489 |
| 33 | 0.0100 | 02540 | 0.0087 | 0.2210 |
| 34 | 0.0092 | 0.2337 | 0.0070 | 0.1956 |
| 35 | 0.0084 | 0.2134 | 0.0069 | 0.1753 |
| 36 | 0.0076 | 0.1930 | 0.0061 | 0.1549 |
| 37 | 0.0068 | 0.1727 | 0.0054 | 0.1372 |
| 38 | 0.0060 | 0.1524 | 0.0048 | 0.1219 |
| 39 | 0.0052 | 0.1321 | 0.0043 | 0.1092 |
| 40 | 0.0048 | 0.1219 | 0.00386 | 0.09804 |
| 41 | 0.0044 | 0.1118 | 0.00343 | 0.08712 |
| 42 | 0.0040 | 0.1016 | 0.00306 | 0.07772 |
| 43 | 0.0036 | 0.0914 | 0.00272 | 0.06909 |
| 44 | 0.0032 | 0.0813 | 0.00242 | 0.06147 |
| 45 | 0.0028 | 0.0711 | 0.00215 | 0.05461 |
| 46 | 0.0024 | 0.0610 | 0.00192 | 0.04877 |
| 47 | 0.0020 | 0.0508 | 0.00170 | 0.04318 |
| 48 | 0.0016 | 0.0406 | 0.00152 | 0.03861 |
| 49 | 0.0012 | 0.0305 | 0.00135 | 0.03429 |
| 50 | 0.0010 | 0.0254 | 0.00120 | 0.03048 |
| 51 | - | 0.00107 | 0.02718 | |
| 52 | - | 0.00095 | 0.02413 |
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