American Wire Gauge - AWG - and circular mils 

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American Wire Gauge (AWG) is a U.S. standard set of wire conductor sizes. The "gauge" is related to the diameter of the wire.

The AWG standard includes copper, aluminum and other wire materials. Typical household copper wiring is AWG number 12 or 14. Telephone wire is usually 22, 24, or 26. The higher the gauge number, the smaller the diameter and the thinner the wire.

The Circular Mil - CM - is a unit of area used especially when denoting the cross-sectional size of a wire or cable.

American Wire Gauge (AWG)	Diameter Mil	Circular Mil (CM)	Area (mm2)	Diameter (mm)
0000	460	211,592	107	11.7
000	410	167,800	85.0	10.4
00	365	133,072	67.4	9.27
0	325	105,531	53.5	8.25
1	289	83,690	42.4	7.35
2	258	66,369	33.6	6.54
3	229	52,633	26.7	5.83
4	204	41,740	21.2	5.19
5	182	33,101	16.8	4.62
6	162	26,251	13.3	4.12
7	144	20,818	10.5	3.67
8	128	16,509	8.37	3.26
9	114	13,092	6.63	2.91
10	102	10,383	5.26	2.59
11	90.7	8,234	4.17	2.31
12	80.8	6,530	3.31	2.05
13	72.0	5,178	2.62	1.83
14	64.1	4,107	2.08	1.63
15	57.1	3,257	1.65	1.45
16	50.8	2,583	1.31	1.29
17	45.3	2,048	1.04	1.15
20	32.0	1,022	0.518	0.812
21	28.5	810.1	0.410	0.723
22	25.3	642.4	0.326	0.644
23	22.6	509.5	0.258	0.573
24	20.1	404.0	0.205	0.511
25	17.9	320.4	0.162	0.455