Wire gauge chart:
Note: Table applies to solid construction copper wire.

Conductor size - (AWG)	Diameter - (mil)	Diameter - (mm)	Area - (CM)	Area - (mm2)	DC Resistance - (W/m)	Current Carrying capacity @ 1500CM/Amp
1	289.3	7.348	83693	42.408	0.000407	55.7
2	257.6	6.544	66371	33.631	0.000513	44.1
3	229.4	5.827	52635	26.670	0.000646	35
4	204.3	5.189	41741	21.151	0.000815	27.7
5	181.9	4.621	33102	16.773	0.00103	22
6	162	4.115	26251	13.302	0.0013	17.5
7	144.3	3.665	20818	10.549	0.00163	13.8
8	128.5	3.264	16510	8.366	0.00206	11
9	114.4	2.906	13093	6.634	0.0026	8.7
10	101.9	2.588	10383	5.261	0.00328	6.9
11	90.74	2.305	8234	4.172	0.00413	5.5
12	80.81	2.053	6530	3.309	0.00521	4.4
13	71.96	1.828	5178	2.624	0.00657	3.5
14	64.08	1.628	4107	2.081	0.00829	2.7
15	57.07	1.45	3257	1.650	0.0104	2.2
16	50.82	1.291	2583	1.309	0.0132	1.7
17	45.26	1.15	2048	1.038	0.0166	1.3
18	40.3	1.024	1624	0.823	0.0209	1.1
19	35.89	0.9116	1288	0.653	0.0264	0.86
20	31.96	0.8118	1022	0.518	0.0333	0.68
21	28.46	0.723	810.1	0.410	0.042	0.54
22	25.35	0.6438	642.4	0.326	0.053	0.43
23	22.57	0.5733	509.5	0.258	0.0668	0.34
24	20.1	0.5106	404	0.205	0.0842	0.27
25	17.9	0.4547	320.4	0.162	0.106	0.21
26	15.94	0.4049	254.1	0.129	0.134	0.17
27	14.2	0.3606	201.5	0.102	0.169	0.13
28	12.64	0.3211	159.8	0.081	0.213	0.11
29	11.26	0.2859	126.7	0.064	0.268	0.084
30	10.03	0.2546	100.5	0.051	0.339	0.067
31	9.92	0.2268	79.7	0.040	0.427	0.053
32	7.95	0.2019	63.21	0.032	0.538	0.042
33	7.08	0.1798	50.13	0.025	0.679	0.033
34	6.3	0.1601	39.75	0.020	0.856	0.026
35	5.61	0.1426	31.52	0.016	1.079	0.021
36	5	0.127	25	0.013	1.361	0.017
37	4.45	0.1131	19.83	0.010	1.716	0.013
38	3.96	0.1007	15.72	0.008	2.164	0.01
39	3.53	0.0897	12.47	0.006	2.729	0.008
40	3.14	0.0799	9.88	0.005	3.441	0.006