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AWG HISTORY:

The American Wire Gauge system (originally called the Brown and Sharpe (B + S) Gauge) originated in the wire drawing industry. The gauge is calculated so that the next largest diameter always has a cross-sectional area that is 26% greater than the previous diameter. The AWG system is a geometrical progression that came about due to the method of wire drawing. For example 36 AWG is defined as 5 mil diameter going all the way to (and beyond) 4/0 AWG at 460 mil diameter.

To calculate mm from the inch measurement: multiply the inch figure by 25.4

To obtain the cross sectional area use the formula: A = 3.142 (Pi) x D (squared)/4

AWG	Inch	Metric
40	0.0031	0.079
39	0.0035	0.89
38	0.004	0.102
37	0.0045	0.114
36	0.005	0.127
35	0.0056	0.142
34	0.0063	0.16
33	0.0071	0.18
32	0.008	0.203
31	0.0089	0.226
30	0.01	0.254
29	0.0113	0.287
28	0.0126	0.32
27	0.0142	0.361
26	0.0159	0.404
25	0.0179	0.455
24	0.0201	0.511
23	0.0226	0.574
22	0.0253	0.643
21	0.0285	0.724
20	0.032	0.813
19	0.0359	0.912
18	0.0403	1.02
17	0.0453	1.15
16	0.0508	1.29
15	0.0571	1.45
14	0.0641	1.63
13	0.072	1.83
12	0.0808	2.05
11	0.0905	2.3
10	0.102	2.6
9	0.114	2.91
8	0.128	3.26
7	0.144	3.67
6	0.162	4.11
5	0.182	4.62
4	0.204	5.19
3	0.229	5.83
2	0.257	6.54
1	0.289	7.35
0	0.324	8.25
00	0.364	9.26
000	0.409	10.4
0000	0.460	11.7
E&OE