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Wire Gauges in
Approximate Decimals of an Inch

Wire Gauges

No. of Wire Gauge Steel Wire Gauge (US)* British Standard
Wire Gauge
(Imperial Wire Gauge)
7/0 0.4900 0.5000
6/0 0.4615 0.4640
5/0 0.4305 0.4320
4/0 0.3938 0.4000
3/0 0.3625 0.3720
2/0 0.3310 0.3480
1/0 0.3065 0.3240
1 0.2830 0.3000
2 0.2625 0.2760
3 0.2437 0.2520
4 0.2253 0.2320
5 0.2070 0.2120
6 0.1920 0.1920
7 0.1770 0.1760
8 0.1620 0.1600
9 0.1483 0.1440
10 0.1350 0.1280
11 0.1205 0.1160
12 0.1055 0.1040
13 0.0915 0.0920
14 0.0800 0.0800
15 0.0720 0.0720
16 0.0625 0.0640
17 0.0540 0.0560
18 0.0475 0.0480
19 0.0410 0.0400
20 0.0348 0.0360
21 0.0318 0.0320
22 0.0286 0.0280
23 0.0258 0.0240
24 0.0230 0.0220
25 0.0204 0.0200
26 0.0181 0.0180
27 0.0173 0.0164
28 0.0162 0.0149
29 0.0150 0.0136
30 0.0140 0.0124
31 0.0132 0.0116
32 0.0128 0.0108
33 0.0118 0.0100
34 0.0104 0.0092
35 0.0095 0.0084
36 0.0090 0.0076
37 0.0085 0.0068
38 0.0080 0.0060
39 0.0075 0.0052
40 0.0070 0.0048
41 0.0066 0.0044
42 0.0062 0.0040
43 0.0060 0.0036
44 0.0058 0.0032
45 0.0055 0.0028
46 0.0052 0.0024
47 0.0050 0.0020
48 0.0048 0.0016
49 0.0046 0.0012
50 0.0044 0.0010
* Also known as Wasburn and Moen, American Steel and Wire Co. and Roebling Wire Gauges. A greater selection of sizes is avaiable and is specified by what are kown as split gauge numbers. They can be recognized by 1/2 fractions which follow the gauge number; i.e., 4-1/2. The decimal equivalents of split gauge numbers are in the Steel Products Manual entitled: Wire and Rods, Carbon Steel published by the American Iron and steel Institute, Washington, DC.