American wire gauge

American wire gauge (AWG) is a way of specifying wire sizes, where each gauge represents a different wire diameter. It was originally applied to non-ferrous, conducting wire, but lately is commonly used to specify body piercing jewelry sizes in the United States.

In common with many non-metric gauging systems, the measurement involved (wire diameter in this case) decreases with increasing gauge number.

Table of AWGs and approximate corresponding sizes

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AWG	Diameter mm	Diameter inches
0000000 (6/0)	14.732	0.5800
000000 (5/0)	13.119	0.5165
00000 (4/0)	11.684	0.4600
000 (3/0)	10.404	0.4096
00 (2/0)	9.266	0.3648
0 (1/0)	8.252	0.3249
1	7.348	0.2893
2	6.543	0.2576
3	5.827	0.2294
4	5.189	0.2043
5	4.621	0.1819
6	4.115	0.1620
7	3.665	0.1443
8	3.264	0.1285
9	2.906	0.1144
10	2.588	0.1019
11	2.304	0.0907
12	2.052	0.0808
13	1.829	0.0720
14	1.628	0.0641
15	1.450	0.0571
16	1.291	0.0508
17	1.150	0.0453
18	1.024	0.0403
19	0.9119	0.0359
20	0.8128	0.0320
21	0.7239	0.0285
22	0.6426	0.0253
23	0.5740	0.0226
24	0.5106	0.0201
25	0.4547	0.0179
26	0.4038	0.0159
27	0.3606	0.0142
28	0.3200	0.0126
29	0.2870	0.0113
30	0.2540	0.0100
31	0.2261	0.0089
32	0.2032	0.0080
33	0.1803	0.0071
34	0.1601	0.0063
35	0.1422	0.0056
36	0.1270	0.0050
37	0.1143	0.0045
38	0.1016	0.0040
39	0.0889	0.0035
40	0.0787	0.0031