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Gauge is the size of a wire. However, the size of a gauge in inches or millimeters varies depending on the association or standard being referenced.
Tables 1 and 2 provide a cross reference in terms of inches and millimeters between twelve industry standards.
Note: Coloring is for visual clarity only.
Gauge |
American (AWG), Brown & Sharpe |
Birmingham, Stubs' Iron Wire |
Washburn & Moen, Roebling, American Steel & Wire |
|||
Inches |
Millimeters |
Inches |
Millimeters |
Inches |
Millimeters |
|
7/0 |
- |
- |
- |
- |
0.4900 |
12.4460 |
6/0 |
0.5800 |
14.7320 |
- |
- |
0.4615 |
11.7221 |
5/0 |
0.5165 |
13.1191 |
0.500 |
12.7000 |
0.4305 |
10.9347 |
4/0 |
0.4600 |
11.6840 |
0.454 |
11.5316 |
0.3938 |
10.0025 |
3/0 |
0.4096 |
10.4038 |
0.425 |
10.7950 |
0.3625 |
9.2075 |
2/0 |
0.3648 |
9.2659 |
0.380 |
9.6520 |
0.3310 |
8.4074 |
0 |
0.3249 |
8.2525 |
0.340 |
8.6360 |
0.3065 |
7.7851 |
1 |
0.2893 |
7.3482 |
0.300 |
7.6200 |
0.2830 |
7.1882 |
2 |
0.2576 |
6.5430 |
0.284 |
7.2136 |
0.2625 |
6.6675 |
3 |
0.2294 |
5.8268 |
0.259 |
6.5786 |
0.2437 |
6.1900 |
4 |
0.2043 |
5.1892 |
0.238 |
6.0452 |
0.2253 |
5.7226 |
5 |
0.1819 |
4.6203 |
0.220 |
5.5880 |
0.2070 |
5.2578 |
6 |
0.1620 |
4.1148 |
0.203 |
5.1562 |
0.1920 |
4.8768 |
7 |
0.1443 |
3.6652 |
0.180 |
4.5720 |
0.1770 |
4.4958 |
8 |
0.1285 |
3.2639 |
0.165 |
4.1910 |
0.1620 |
4.1148 |
9 |
0.1144 |
2.9058 |
0.148 |
3.7592 |
0.1483 |
3.7668 |
10 |
0.1019 |
2.5883 |
0.134 |
3.4036 |
0.1350 |
3.4290 |
11 |
0.0907 |
2.3038 |
0.120 |
3.0480 |
0.1205 |
3.0607 |
12 |
0.0808 |
2.0523 |
0.109 |
2.7686 |
0.1055 |
2.6797 |
13 |
0.0720 |
1.8288 |
0.095 |
2.4130 |
0.0915 |
2.3241 |
14 |
0.0641 |
1.6281 |
0.083 |
2.1082 |
0.0800 |
2.0320 |
15 |
0.0571 |
1.4503 |
0.072 |
1.8288 |
0.0720 |
1.8288 |
16 |
0.0508 |
1.2903 |
0.065 |
1.6510 |
0.0625 |
1.5875 |
17 |
0.0453 |
1.1506 |
0.058 |
1.4732 |
0.0540 |
1.3716 |
18 |
0.0403 |
1.0236 |
0.049 |
1.2446 |
0.0475 |
1.2065 |
19 |
0.0359 |
0.9119 |
0.042 |
1.0668 |
0.0410 |
1.0414 |
20 |
0.0320 |
0.8128 |
0.035 |
0.8890 |
0.0348 |
0.8839 |
21 |
0.0285 |
0.7239 |
0.032 |
0.8128 |
0.0318 |
0.8077 |
22 |
0.0253 |
0.6426 |
0.028 |
0.7112 |
0.0286 |
0.7264 |
23 |
0.0226 |
0.5740 |
0.025 |
0.6350 |
0.0258 |
0.6553 |
24 |
0.0201 |
0.5105 |
0.022 |
0.5588 |
0.0230 |
0.5842 |
25 |
0.0179 |
0.4547 |
0.020 |
0.5080 |
0.0204 |
0.5182 |
26 |
0.0159 |
0.4039 |
0.018 |
0.4572 |
0.0181 |
0.4597 |
27 |
0.0142 |
0.3607 |
0.016 |
0.4064 |
0.0173 |
0.4394 |
28 |
0.0126 |
0.3200 |
0.014 |
0.3556 |
0.0162 |
0.4115 |
29 |
0.0113 |
0.2870 |
0.013 |
0.3302 |
0.0150 |
0.3810 |
30 |
0.0100 |
0.2540 |
0.012 |
0.3048 |
0.0140 |
0.3556 |
31 |
0.0089 |
0.2261 |
0.010 |
0.2540 |
0.0132 |
0.3353 |
32 |
0.0080 |
0.2032 |
0.009 |
0.2286 |
0.0128 |
0.3251 |
33 |
0.0071 |
0.1803 |
0.008 |
0.2032 |
0.0118 |
0.2997 |
34 |
0.0063 |
0.1600 |
0.007 |
0.1778 |
0.0104 |
0.2642 |
35 |
0.0056 |
0.1422 |
0.005 |
0.1270 |
0.0095 |
0.2413 |
36 |
0.0050 |
0.1270 |
0.004 |
0.1016 |
0.0090 |
0.2286 |
37 |
0.0045 |
0.1143 |
- |
- |
- |
- |
38 |
0.0040 |
0.1016 |
- |
- |
- |
- |
39 |
0.0035 |
0.0889 |
- |
- |
- |
- |
40 |
0.0031 |
0.0787 |
- |
- |
- |
- |
41 |
0.0028 |
0.0711 |
- |
- |
- |
- |
42 |
0.0025 |
0.0635 |
- |
- |
- |
- |
43 |
0.0022 |
0.0559 |
- |
- |
- |
- |
44 |
0.00198 |
0.0503 |
- |
- |
- |
- |
45 |
0.00176 |
0.0447 |
- |
- |
- |
- |
46 |
0.00157 |
0.0399 |
- |
- |
- |
- |
47 |
0.00140 |
0.0356 |
- |
- |
- |
- |
48 |
0.00124 |
0.0315 |
- |
- |
- |
- |
49 |
0.001108 |
0.0281 |
- |
- |
- |
- |
50 |
0.000990 |
0.0251 |
- |
- |
- |
- |