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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 |
Stubs' Steel |
Imperial (S.G.W.) |
Whitworth's |
Steel Wire Gauge, Waterbury |
||||
Inches |
Millimeters |
Inches |
Millimeters |
Inches |
Millimeters |
Inches |
Millimeters |
|
9/0 |
- |
- |
- |
- |
- |
- |
0.0050 |
0.1270 |
8/0 |
- |
- |
- |
- |
- |
- |
0.0055 |
0.1397 |
7/0 |
- |
- |
0.5000 |
12.7000 |
- |
- |
0.0060 |
0.1524 |
6/0 |
- |
- |
0.4640 |
11.7856 |
- |
- |
0.0065 |
0.1651 |
5/0 |
- |
- |
0.4320 |
10.9728 |
- |
- |
0.0070 |
0.1778 |
4/0 |
- |
- |
0.4000 |
10.1600 |
- |
- |
0.0075 |
0.1905 |
3/0 |
- |
- |
0.3720 |
9.4488 |
- |
- |
0.0080 |
0.2032 |
2/0 |
- |
- |
0.3480 |
8.8392 |
- |
- |
0.0085 |
0.2159 |
0 |
- |
- |
0.3240 |
8.2296 |
- |
- |
0.0090 |
0.2286 |
1 |
0.227 |
5.7658 |
0.3000 |
7.6200 |
0.001 |
0.0254 |
0.010 |
0.2540 |
2 |
0.219 |
5.5626 |
0.2760 |
7.0104 |
0.002 |
0.0508 |
0.011 |
0.2794 |
3 |
0.212 |
5.3848 |
0.2520 |
6.4008 |
0.003 |
0.0762 |
0.012 |
0.3048 |
4 |
0.207 |
5.2578 |
0.2320 |
5.8928 |
0.004 |
0.1016 |
0.013 |
0.3302 |
5 |
0.204 |
5.1816 |
0.2120 |
5.3848 |
0.005 |
0.1270 |
0.014 |
0.3556 |
6 |
0.201 |
5.1054 |
0.1920 |
4.8768 |
0.006 |
0.1524 |
0.016 |
0.4064 |
7 |
0.199 |
5.0546 |
0.1760 |
4.4704 |
0.007 |
0.1778 |
0.018 |
0.4572 |
8 |
0.197 |
5.0038 |
0.1600 |
4.0640 |
0.008 |
0.2032 |
0.020 |
0.5080 |
9 |
0.194 |
4.9276 |
0.1440 |
3.6576 |
0.009 |
0.2286 |
0.022 |
0.5588 |
10 |
0.191 |
4.8514 |
0.1280 |
3.2512 |
0.010 |
0.2540 |
0.024 |
0.6096 |
11 |
0.188 |
4.7752 |
0.1160 |
2.9464 |
0.011 |
0.2794 |
0.026 |
0.6604 |
12 |
0.185 |
4.6990 |
0.1040 |
2.6416 |
0.012 |
0.3048 |
0.028 |
0.7112 |
13 |
0.182 |
4.6228 |
0.0920 |
2.3368 |
0.013 |
0.3302 |
0.030 |
0.7620 |
14 |
0.180 |
4.5720 |
0.0800 |
2.0320 |
0.014 |
0.3556 |
0.032 |
0.8128 |
15 |
0.178 |
4.5212 |
0.0720 |
1.8288 |
0.015 |
0.3810 |
0.034 |
0.8636 |
16 |
0.175 |
4.4450 |
0.0640 |
1.6256 |
0.016 |
0.4064 |
0.036 |
0.9144 |
17 |
0.172 |
4.3688 |
0.0560 |
1.4224 |
0.017 |
0.4318 |
0.038 |
0.9652 |
18 |
0.168 |
4.2672 |
0.0480 |
1.2192 |
0.018 |
0.4572 |
0.040 |
1.0160 |
19 |
0.164 |
4.1656 |
0.0400 |
1.0160 |
0.019 |
0.4826 |
0.042 |
1.0668 |
20 |
0.161 |
4.0894 |
0.0360 |
0.9144 |
0.020 |
0.5080 |
0.044 |
1.1176 |
21 |
0.157 |
3.9878 |
0.0320 |
0.8128 |
0.021 |
0.5334 |
0.046 |
1.1684 |
22 |
0.155 |
3.9370 |
0.0280 |
0.7112 |
0.022 |
0.5588 |
0.048 |
1.2192 |
23 |
0.153 |
3.8862 |
0.0240 |
0.6996 |
0.023 |
0.5842 |
0.051 |
1.2954 |
24 |
0.151 |
3.8354 |
0.0220 |
0.5588 |
0.024 |
0.6096 |
0.055 |
1.3970 |
25 |
0.148 |
3.7592 |
0.0200 |
0.5080 |
0.025 |
0.6350 |
0.059 |
1.4986 |
26 |
0.146 |
3.7084 |
0.0180 |
0.4572 |
0.026 |
0.6604 |
0.063 |
1.6002 |
27 |
0.143 |
3.6322 |
0.0164 |
0.4166 |
0.027 |
0.6858 |
0.067 |
1.7018 |
28 |
0.139 |
3.5306 |
0.0149 |
0.3785 |
0.028 |
0.7112 |
0.071 |
1.8034 |
29 |
0.134 |
3.4036 |
0.0136 |
0.3454 |
0.029 |
0.7366 |
0.074 |
1.8796 |
30 |
0.127 |
3.2258 |
0.0124 |
0.3150 |
0.030 |
0.7620 |
0.078 |
1.9812 |
31 |
0.120 |
3.0480 |
0.0116 |
0.2946 |
0.031 |
0.7874 |
0.082 |
2.0828 |
32 |
0.115 |
2.9210 |
0.0108 |
0.2743 |
0.032 |
0.8128 |
0.086 |
2.1844 |
33 |
0.112 |
2.8448 |
0.0100 |
0.2540 |
0.033 |
0.8382 |
0.090 |
2.2860 |
34 |
0.110 |
2.7940 |
0.0092 |
0.2337 |
0.034 |
0.8636 |
0.094 |
2.3876 |
35 |
0.108 |
2.7432 |
0.0084 |
0.2134 |
0.035 |
0.8890 |
0.098 |
2.4892 |
36 |
0.106 |
2.6924 |
0.0076 |
0.1930 |
0.036 |
0.9144 |
0.102 |
2.5908 |
37 |
0.103 |
2.6162 |
0.0068 |
0.1727 |
0.037 |
0.9398 |
0.106 |
2.6924 |
38 |
0.101 |
2.5654 |
0.0060 |
0.1524 |
0.038 |
0.9652 |
0.112 |
2.8448 |
39 |
0.099 |
2.5146 |
0.0052 |
0.1321 |
0.039 |
0.9906 |
0.118 |
2.9972 |
40 |
0.097 |
2.4638 |
0.0048 |
0.1219 |
0.040 |
1.0160 |
0.125 |
3.1750 |
41 |
0.095 |
2.4130 |
0.0044 |
0.1118 |
0.041 |
1.0414 |
0.132 |
3.3528 |
42 |
0.092 |
2.3368 |
0.0040 |
0.1016 |
0.042 |
1.0668 |
0.139 |
3.5306 |
43 |
0.088 |
2.2352 |
0.0036 |
0.0914 |
0.043 |
1.0922 |
0.146 |
3.7084 |
44 |
0.085 |
2.1590 |
0.0032 |
0.0813 |
0.044 |
1.1176 |
0.153 |
3.8862 |
45 |
0.081 |
2.0574 |
0.0028 |
0.0711 |
0.045 |
1.1430 |
0.160 |
4.0640 |
46 |
0.079 |
2.0066 |
0.0024 |
0.0610 |
0.046 |
1.1684 |
- |
- |
47 |
0.077 |
1.9558 |
0.0020 |
0.0508 |
0.047 |
1.1938 |
- |
- |
48 |
0.075 |
1.9050 |
0.0016 |
0.0406 |
0.048 |
1.2192 |
- |
- |
49 |
0.072 |
1.8288 |
0.0012 |
0.0305 |
0.049 |
1.2446 |
- |
- |
50 |
0.069 |
1.7526 |
0.0010 |
0.0254 |
0.050 |
1.2700 |
- |
- |
51 |
0.066 |
1.6764 |
- |
- |
0.051 |
1.2954 |
- |
- |
52 |
0.063 |
1.6002 |
- |
- |
0.052 |
1.3208 |
- |
- |
53 |
0.058 |
1.4732 |
- |
- |
0.053 |
1.3462 |
- |
- |
54 |
0.055 |
1.3970 |
- |
- |
0.054 |
1.3716 |
- |
- |
55 |
0.050 |
1.2700 |
- |
- |
0.055 |
1.3970 |
- |
- |
56 |
0.045 |
1.1430 |
- |
- |
0.056 |
1.4224 |
- |
- |
57 |
0.042 |
1.0668 |
- |
- |
0.057 |
1.4478 |
- |
- |
58 |
0.041 |
1.0414 |
- |
- |
0.058 |
1.4732 |
- |
- |
59 |
0.040 |
1.0160 |
- |
- |
0.059 |
1.4986 |
- |
- |
60 |
0.039 |
0.9906 |
- |
- |
0.060 |
1.4240 |
- |
- |
61 |
0.038 |
0.9652 |
- |
- |
0.061 |
1.5494 |
- |
- |
62 |
0.037 |
0.9398 |
- |
- |
0.062 |
1.5748 |
- |
- |
63 |
0.036 |
0.9144 |
- |
- |
0.063 |
1.6002 |
- |
- |
64 |
0.035 |
0.8890 |
- |
- |
0.064 |
1.6256 |
- |
- |
65 |
0.033 |
0.8382 |
- |
- |
0.065 |
1.6510 |
- |
- |
66 |
0.032 |
0.8128 |
- |
- |
0.066 |
1.6764 |
- |
- |
67 |
0.031 |
0.7874 |
- |
- |
0.067 |
1.7018 |
- |
- |
68 |
0.030 |
0.7620 |
- |
- |
0.068 |
1.7272 |
- |
- |
69 |
0.029 |
0.7366 |
- |
- |
0.069 |
1.7526 |
- |
- |
70 |
0.027 |
0.6858 |
- |
- |
0.070 |
1.7780 |
- |
- |
71 |
0.026 |
0.6604 |
- |
- |
0.071 |
1.8034 |
- |
- |
72 |
0.024 |
0.6096 |
- |
- |
0.072 |
1.8288 |
- |
- |
73 |
0.023 |
0.5842 |
- |
- |
0.073 |
1.8542 |
- |
- |
74 |
0.022 |
0.5588 |
- |
- |
0.074 |
1.8796 |
- |
- |
75 |
0.020 |
0.5080 |
- |
- |
0.075 |
1.9050 |
- |
- |
76 |
0.018 |
0.4572 |
- |
- |
0.076 |
1.9304 |
- |
- |
77 |
0.016 |
0.4064 |
- |
- |
0.077 |
1.9558 |
- |
- |
78 |
0.015 |
0.3810 |
- |
- |
0.078 |
1.9812 |
- |
- |
79 |
0.014 |
0.3556 |
- |
- |
0.079 |
2.0066 |
- |
- |
80 |
0.013 |
0.3302 |
- |
- |
0.080 |
2.0320 |
- |
- |