Structural Wire Conversion Tables
[ for mm diameter, multiply inches below by 25.4 ]
For electrical wire physical comparisons - metric to AWG, click here
For sheet metal gauge to metric click here

Wire Number	Imperial Standard Wire Gauge	American Wire Gauge
gauge	ins. dia.	ins. dia.
0000000 (7/0)	0.5000	-
000000 (6/0)	0.4640	0.580000
00000 (5/0)	0.4320	0.516500
0000 (4/0)	0.4000	0.460000
000 (3/0)	0.3720	0.409642
00 (2/0)	0.3480	0.364796
0 (1/0)	0.3240	0.324861
1	0.3000	0.289297
2	0.2760	0.257627
3	0.2520	0.229423
4	0.2320	0.2043
5	0.2120	0.1819
6	0.1920	0.1620
7	0.1760	0.1443
8	0.1600	0.1285
9	0.1440	0.1144
10	0.1280	0.1019
11	0.1160	0.0907
12	0.1040	0.0808
13	0.0920	0.0720
14	0.0800	0.0641
15	0.0720	0.0571
16	0.0640	0.0508
17	0.0560	0.0453
18	0.0480	0.0403
19	0.0400	0.0359
20	0.0360	0.0320
21	0.0320	0.0285
22	0.0280	0.0253
23	0.0240	0.0226
24	0.0220	0.0201
25	0.0200	0.0179
26	0.0180	0.0159
27	0.0164	0.0142
28	0.0148	0.0126
29	0.0136	0.0113
30	0.0124	0.0100
31	0.0116	0.0089
32	0.0108	0.0080
33	0.0100	0.0071
34	0.0092	0.0063
35	0.0084	0.0056
36	0.0076	0.0050
37	0.0068	0.0045
38	0.0060	0.0040
39	0.0052	0.0035
40	0.0048	0.0031
41	0.0044	0.0028
42	0.0040	0.0025
43	0.0036	0.0022
44	0.0032	0.0020
45	0.0028	0.0018
46	0.0024	0.0016
47	0.0020	0.0014
48	0.0016	0.0012
49	0.0012	0.0011
50	0.0010	0.0010
51	-	0.00088
52	-	0.00078
53	-	0.00070
54	-	0.00062
55	-	0.00055
56	-	0.00049

For metric conversions go to a unit starting with -
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