Wire and Sheet Metal Gauge Equivalents

Number	Imperial Standard (swg)		Birmingham Wire (bwg)
	ins	mm	ins	mm
7/0	.500	12.70	-	-
6/0	.464	11.78	-	-
5/0	.432	10.97	-	-
4/0	.400	10.16	.454	11.53
3/0	.372	9.45	.425	10.69
2/0	.348	8.84	3.80	.965
0	.324	8.23	.340	8.63
1	.300	7.620	.300	7.62
2	.276	7.010	.284	7.21
3	.252	6.400	.259	6.58
4	.232	5.893	.238	6.05
5	.212	5.385	.220	5.59
6	.192	4.877	.203	5.16
7	.176	4.470	.180	4.57
8	.160	4.064	1.65	4.19
9	.144	3.657	.148	3.76
10	.128	3.251	.134	3.40
11	.116	2.946	.120	3.04
12	.104	2.641	.109	2.77
13	.092	2.337	.095	2.41
14	.080	2.032	.083	2.11
15	.072	1.828	.072	1.83
16	.064	1.626	.065	1.65
17	.056	1.422	.058	1.47
18	.048	1.219	.049	1.24
19	.040	1.02	.042	1.07
20	.036	.914	.035	.888
21	.032	.813	.032	.813
22	.028	.711	.028	.711
23	.024	.610	.025	.635
24	.0220	.559	.022	.559
25	.020	.508	.020	.508
26	.0180	.457	.018	.457
27	.0164	.417	.016	.406
28	.0148	.376	.014	.356
29	.0136	.345	.013	.330
30	.0124	.315	.012	.305
31	.0116	.295	.010	.254
32	.0108	.274	.009	.228
33	.0100	.254	.008	.203
34	.0092	.234	.007	.178
35	.0084	.213	.005	.127
36	.0076	.193	.004	.102
37	.0068	.173
38	.0060	.152
39	.0052	.132
40	.0048	.122

The values above are for guidance only and subject to revision