AWG wire gauge chart

Diameter, cross-section and copper resistance at 20 °C for AWG 0000 to 40, computed from the AWG definition, with the nearest IEC 60228 metric size. For a metric size or a measured diameter, use the calculator.

Indicative values; verify before use.

AWG 0000 to 40, solid copper at 20 °C

AWG	Diameter mm	Diameter in	Area mm²	Area cmil	Copper Ω/km	Copper Ω/1000 ft	Nearest IEC 60228 mm² (difference)
0000	11.68	0.4600	107.2	211600	0.1608	0.04901	> 50
000	10.40	0.4096	85.03	167806	0.2028	0.06180	> 50
00	9.266	0.3648	67.43	133077	0.2557	0.07793	> 50
0	8.251	0.3249	53.48	105535	0.3224	0.09827	> 50
1	7.348	0.2893	42.41	83693	0.4065	0.1239	50 (+18 %)
2	6.544	0.2576	33.63	66371	0.5126	0.1562	35 (+4 %)
3	5.827	0.2294	26.67	52635	0.6464	0.1970	25 (−6 %)
4	5.189	0.2043	21.15	41741	0.8151	0.2484	25 (+18 %)
5	4.621	0.1819	16.77	33102	1.028	0.3133	16 (−5 %)
6	4.115	0.1620	13.30	26251	1.296	0.3950	16 (+20 %)
7	3.665	0.1443	10.55	20818	1.634	0.4981	10 (−5 %)
8	3.264	0.1285	8.366	16510	2.061	0.6281	10 (+20 %)
9	2.906	0.1144	6.634	13093	2.599	0.7921	6 (−10 %)
10	2.588	0.1019	5.261	10383	3.277	0.9988	6 (+14 %)
11	2.305	0.09074	4.172	8234	4.132	1.259	4 (−4 %)
12	2.053	0.08081	3.309	6530	5.210	1.588	4 (+21 %)
13	1.828	0.07196	2.624	5178	6.570	2.003	2.5 (−5 %)
14	1.628	0.06408	2.081	4107	8.285	2.525	2.5 (+20 %)
15	1.450	0.05707	1.650	3257	10.45	3.184	1.5 (−9 %)
16	1.291	0.05082	1.309	2583	13.17	4.015	1.5 (+15 %)
17	1.150	0.04526	1.038	2048	16.61	5.063	1 (−4 %)
18	1.024	0.04030	0.8230	1624	20.95	6.385	0.75 (−9 %)
19	0.9116	0.03589	0.6527	1288	26.41	8.051	0.75 (+15 %)
20	0.8118	0.03196	0.5176	1022	33.31	10.15	0.5 (−3 %)
21	0.7229	0.02846	0.4105	810.1	42.00	12.80	< 0.5
22	0.6438	0.02535	0.3255	642.4	52.96	16.14	< 0.5
23	0.5733	0.02257	0.2582	509.5	66.78	20.35	< 0.5
24	0.5106	0.02010	0.2047	404.0	84.21	25.67	< 0.5
25	0.4547	0.01790	0.1624	320.4	106.2	32.37	< 0.5
26	0.4049	0.01594	0.1288	254.1	133.9	40.81	< 0.5
27	0.3606	0.01420	0.1021	201.5	168.8	51.46	< 0.5
28	0.3211	0.01264	0.08098	159.8	212.9	64.89	< 0.5
29	0.2859	0.01126	0.06422	126.7	268.5	81.83	< 0.5
30	0.2546	0.01003	0.05093	100.5	338.5	103.2	< 0.5
31	0.2268	0.008928	0.04039	79.70	426.9	130.1	< 0.5
32	0.2019	0.007950	0.03203	63.21	538.3	164.1	< 0.5
33	0.1798	0.007080	0.02540	50.13	678.8	206.9	< 0.5
34	0.1601	0.006305	0.02014	39.75	855.9	260.9	< 0.5
35	0.1426	0.005615	0.01597	31.52	1079	329.0	< 0.5
36	0.1270	0.005000	0.01267	25.00	1361	414.8	< 0.5
37	0.1131	0.004453	0.01005	19.83	1716	523.1	< 0.5
38	0.1007	0.003965	0.007967	15.72	2164	659.6	< 0.5
39	0.08969	0.003531	0.006318	12.47	2729	831.7	< 0.5
40	0.07987	0.003145	0.005010	9.888	3441	1049	< 0.5

d = 0.127 mm × 92^((36 − n)/39) (0 = 1/0, 00 = −1, 000 = −2, 0000 = −3); A = π/4 × d²; R = ρ / A with ρ = 1.724 × 10⁻⁸ Ω·m (annealed copper, IACS 100 %, 20 °C). 4 significant digits. cmil = (diameter in mil)². The IEC column is the nearest nominal size of 0.5, 0.75, 1, 1.5, 2.5, 4, 6, 10, 16, 25, 35 and 50 mm², and the difference is how much larger (+) or smaller (−) it is than the AWG wire.

No current (ampacity) ratings: they depend on the wiring rules that apply (for example the NEC or IEC 60364-5-52), the insulation, the ambient temperature, bundling and the installation, not on the gauge alone.

Sources (checked 2026-11-03): AWG definition (ASTM B258) https://en.wikipedia.org/wiki/American_wire_gauge; annealed copper standard https://en.wikipedia.org/wiki/International_Annealed_Copper_Standard; IEC 60228 sizes https://en.wikipedia.org/wiki/IEC_60228.