What is wire gauge?

Wire gauge is a measuring system to denote the diameter (thickness) of wire. The system goes from 0000 through to 40. The larger the wire gauge number, the thinner the wire.

The chart below shows the Wire Gauge Chart with diameter conversions into inches and millimetres. We have only gone to 32 as we do not supply wire in smaller diameters.

Wire Gauge	Diameter in mm	Diameter in inches
0000	11.68	0.46
000	10.40	0.41
00	9.27	0.36
0	8.25	0.32
1	7.35	0.29
2	6.54	0.26
3	5.83	0.23
4	5.19	0.20
5	4.62	0.18
6	4.11	0.16
7	3.67	0.14
8	3.26	0.13
9	2.91	0.114
10	2.59	0.102
11	2.30	0.091
12	2.05	0.081
13	1.83	0.072
14	1.63	0.064
15	1.45	0.057
16	1.29	0.051
17	1.15	0.045
18	1.02	0.040
19	0.91	0.036
20	0.81	0.032
21	0.72	0.029
22	0.65	0.025
23	0.57	0.023
24	0.51	0.020
25	0.45	0.018
26	0.40	0.016
27	0.36	0.014
28	0.32	0.013
29	0.29	0.011
30	0.25	0.010
31	0.23	0.009
32	0.20	0.008