American wire gauge

American wire gauge (AWG) tells the diameter of an electrical conductor. The conductor's current capacity depends upon the resistance per unit length and the temperature rating of the insulation. Wire type THHN is rated at 90 °C.

Tables of AWG wire sizes simplified from Wikipedia

AWG	Diameter		Turns of wire, without insulation		Area		Copper wire
							Resistance/length		Ampacity
									60 °C	75 °C	90 °C
	(in)	(mm)	(per in)	(per cm)	(kcmil)	(mm2)	(mΩ/m	(mΩ/ft	(A)
0000 (4/0)	0.4600	11.684	2.17	0.856	212	107	0.1608	0.04901	195	230	260
000 (3/0)	0.4096	10.405	2.44	0.961	168	85.0	0.2028	0.06180	165	200	225
00 (2/0)	0.3648	9.266	2.74	1.08	133	67.4	0.2557	0.07793	145	175	195
0 (1/0)	0.3249	8.251	3.08	1.21	106	53.5	0.3224	0.09827	125	150	170
1	0.2893	7.348	3.46	1.36	83.7	42.4	0.4066	0.1239	110	130	145
2	0.2576	6.544	3.88	1.53	66.4	33.6	0.5127	0.1563	95	115	130
3	0.2294	5.827	4.36	1.72	52.6	26.7	0.6465	0.1970	85	100	115
4	0.2043	5.189	4.89	1.93	41.7	21.2	0.8152	0.2485	70	85	95
5	0.1819	4.621	5.50	2.16	33.1	16.8	1.028	0.3133
6	0.1620	4.115	6.17	2.43	26.3	13.3	1.296	0.3951	55	65	75
7	0.1443	3.665	6.93	2.73	20.8	10.5	1.634	0.4982
8	0.1285	3.264	7.78	3.06	16.5	8.37	2.061	0.6282	40	50	55
9	0.1144	2.906	8.74	3.44	13.1	6.63	2.599	0.7921
10	0.1019	2.588	9.81	3.86	10.4	5.26	3.277	0.9989	30	35	40
11	0.0907	2.305	11.0	4.34	8.23	4.17	4.132	1.260
12	0.0808	2.053	12.4	4.87	6.53	3.31	5.211	1.588	20	25	30
13	0.0720	1.828	13.9	5.47	5.18	2.62	6.571	2.003
14	0.0641	1.628	15.6	6.14	4.11	2.08	8.286	2.525	15	20	25
15	0.0571	1.450	17.5	6.90	3.26	1.65	10.45	3.184
16	0.0508	1.291	19.7	7.75	2.58	1.31	13.17	4.016	22*free air	13*enclosed	18
17	0.0453	1.150	22.1	8.70	2.05	1.04	16.61	5.064
18	0.0403	1.024	24.8	9.77	1.62	0.823	20.95	6.385	10	14	16
19	0.0359	0.912	27.9	11.0	1.29	0.653	26.42	8.051	—	—	—
20	0.0320	0.812	31.3	12.3	1.02	0.518	33.31	10.15	7.5	11	—
21	0.0285	0.723	35.1	13.8	0.810	0.410	42.00	12.80	—	—	—
22	0.0253	0.644	39.5	15.5	0.642	0.326	52.96	16.14	7	5	—
23	0.0226	0.573	44.3	17.4	0.509	0.258	66.79	20.36	—	—	—
24	0.0201	0.511	49.7	19.6	0.404	0.205	84.22	25.67	3.5	2.1	—
25	0.0179	0.455	55.9	22.0	0.320	0.162	106.2	32.37	—	—	—
26	0.0159	0.405	62.7	24.7	0.254	0.129	133.9	40.81	2.2	1.3	—
27	0.0142	0.361	70.4	27.7	0.202	0.102	168.9	51.47	—	—	—
28	0.0126	0.321	79.1	31.1	0.160	0.0810	212.9	64.90	1.4	0.85	—
29	0.0113	0.286	88.8	35.0	0.127	0.0642	268.5	81.84	—	—	—
30	0.0100	0.255	99.7	39.3	0.101	0.0509	338.6	103.2	0.86	0.52	—
31	0.00893	0.227	112	44.1	0.0797	0.0404	426.9	130.1	—	—	—
32	0.00795	0.202	126	49.5	0.0632	0.0320	538.3	164.1	0.53	0.3	—
33	0.00708	0.180	141	55.6	0.0501	0.0254	678.8	206.9	—	—	—
34	0.00630	0.160	159	62.4	0.0398	0.0201	856.0	260.9	0.3	0.180	—
35	0.00561	0.143	178	70.1	0.0315	0.0160	1079	329.0	—	—	—
36	0.00500	0.127	200	78.7	0.0250	0.0127	1361	414.8	—	—	—
37	0.00445	0.113	225	88.4	0.0198	0.0100	1716	523.1	—	—	—
38	0.00397	0.101	252	99.3	0.0157	0.00797	2164	659.6	—	—	—
39	0.00353	0.0897	283	111	0.0125	0.00632	2729	831.8	—	—	—
40	0.00314	0.0799	318	125	0.00989	0.00501	3441	1049	—	—	—