The table below shows various data including both the resistance of the various wire gauges and the allowable current (ampacity) based on plastic insulation. The diameter information in the table applies to solid wires. Stranded wires are calculated by calculating the equivalent cross sectional copper area. Fusing Current (melting wire) is estimated based on 25 °C. The table below assumes DC, or AC frequencies equal to or less than 60 Hz, and does not take skin effect into account. Turns of wire is on a best-case scenario when winding tightly packed coils with no insulation.

AWG	Diameter		Turns of wire		Area		Copper resistance		NEC copper wire ampacity with 60/75/ 90 °C insulation (A)	Approximate stranded metric equivalents	Fusing Current (copper)
	(inch)	(mm)	(per inch)	(per cm)	(kcmil)	(mm2)	(Ω/km)	(Ω/kFT)			Preese (~10s)	Onderdonk (1s)	Onderdonk (32ms)
0000 (4/0)	0.4600	11.684	2.17	0.856	212	107	0.1608	0.04901	195 / 230 / 260			31KA	173KA
000 (3/0)	0.4096	10.404	2.44	0.961	168	85.0	0.2028	0.06180	165 / 200 / 225			24.5KA	137KA
00 (2/0)	0.3648	9.266	2.74	1.08	133	67.4	0.2557	0.07793	145 / 175 / 195			19.5KA	109KA
0 (1/0)	0.3249	8.252	3.08	1.21	106	53.5	0.3224	0.09827	125 / 150 / 170		1.9KA	15.5KA	87KA
1	0.2893	7.348	3.46	1.36	83.7	42.4	0.4066	0.1239	110 / 130 / 150		1.6KA	12KA	68KA
2	0.2576	6.544	3.88	1.53	66.4	33.6	0.5127	0.1563	95 / 115 / 130		1.3KA	9.7KA	54KA
3	0.2294	5.827	4.36	1.72	52.6	26.7	0.6465	0.1970	85 / 100 / 110	196/0.4	1.1KA	7.7KA	43KA
4	0.2043	5.189	4.89	1.93	41.7	21.2	0.8152	0.2485	70 / 85 / 95		946A	6.1KA	34KA
5	0.1819	4.621	5.50	2.16	33.1	16.8	1.028	0.3133		126/0.4	795A	4.8KA	27KA
6	0.1620	4.115	6.17	2.43	26.3	13.3	1.296	0.3951	55 / 65 / 75		668A	3.8KA	21KA
7	0.1443	3.665	6.93	2.73	20.8	10.5	1.634	0.4982		80/0.4	561A	3KA	17KA
8	0.1285	3.264	7.78	3.06	16.5	8.37	2.061	0.6282	40 / 50 / 55		472A	2.4KA	13.5KA
9	0.1144	2.906	8.74	3.44	13.1	6.63	2.599	0.7921		84/0.3	396A	1.9KA	10.7KA
10	0.1019	2.588	9.81	3.86	10.4	5.26	3.277	0.9989	30 / 35 / 40		333A	1.5KA	8.5KA
11	0.0907	2.305	11.0	4.34	8.23	4.17	4.132	1.260		56/0.3	280A	1.2KA	6.7KA
12	0.0808	2.053	12.4	4.87	6.53	3.31	5.211	1.588	25 / 25 / 30		235A	955A	5.3KA
13	0.0720	1.828	13.9	5.47	5.18	2.62	6.571	2.003		50/0.25	198A	758A	4.2KA
14	0.0641	1.628	15.6	6.14	4.11	2.08	8.286	2.525	20 / 20 / 25		166A	601A	3.3KA
15	0.0571	1.450	17.5	6.90	3.26	1.65	10.45	3.184		30/0.25	140A	477A	2.7KA
16	0.0508	1.291	19.7	7.75	2.58	1.31	13.17	4.016	— / — / 18		117A	377A	2.1KA
17	0.0453	1.150	22.1	8.70	2.05	1.04	16.61	5.064		32/0.2	99A	300A	1.7KA
18	0.0403	1.024	24.8	9.77	1.62	0.823	20.95	6.385	— / — / 14	24/0.2	83A	237A	1.3KA
19	0.0359	0.912	27.9	11.0	1.29	0.653	26.42	8.051			70A	189A	1KA
20	0.0320	0.812	31.3	12.3	1.02	0.518	33.31	10.15		16/0.2	58.5A	149A	834A
21	0.0285	0.723	35.1	13.8	0.810	0.410	42.00	12.80		13/0.2	49A	119A	662A
22	0.0253	0.644	39.5	15.5	0.642	0.326	52.96	16.14		7/0.25	41A	94A	525A
23	0.0226	0.573	44.3	17.4	0.509	0.258	66.79	20.36			35A	74A	416A
24	0.0201	0.511	49.7	19.6	0.404	0.205	84.22	25.67		1/0.5, 7/0.2, 30/0.1	29A	59A	330A
25	0.0179	0.455	55.9	22.0	0.320	0.162	106.2	32.37			24A	47A	262A
26	0.0159	0.405	62.7	24.7	0.254	0.129	133.9	40.81		7/0.15	20A	37A	208A
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
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		1/0.25, 7/0.1
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		1/0.2, 7/0.08
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
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