Wire Gauge (AWG) Calculator

AWG wire gauge chart from 0000 to 40: diameter in mm and inches, area in mm² and kcmil, and copper resistance per km, with the formula.

AWG 10 has

2.588 mm · 5.261 mm²

Estimate only. Not engineering or safety advice. Check the result against the applicable standard and the equipment data, and have a competent engineer review it before it is relied on. Terms of use.

Open in the calculator with these values

Formula

d = 0.127 mm × 92^((36 − n) / 39) A = π d² / 4

AWG chart

AWG	Diameter (mm)	Diameter (in)	Area (mm²)	kcmil	Copper Ω/km
0000	11.684	0.46	107.2193	211.6	0.1608
000	10.4049	0.4096	85.0288	167.806	0.2028
00	9.2658	0.3648	67.4309	133.077	0.2557
0	8.2515	0.3249	53.4751	105.535	0.3224
1	7.3481	0.2893	42.4077	83.693	0.4066
2	6.5437	0.2576	33.6308	66.371	0.5127
3	5.8273	0.2294	26.6705	52.635	0.6464
4	5.1894	0.2043	21.1506	41.741	0.8152
5	4.6213	0.1819	16.7732	33.102	1.0279
6	4.1154	0.162	13.3018	26.251	1.2961
7	3.6649	0.1443	10.5488	20.818	1.6344
8	3.2636	0.1285	8.3656	16.51	2.0609
9	2.9064	0.1144	6.6342	13.093	2.5988
10	2.5882	0.1019	5.2612	10.383	3.277
11	2.3048	0.0907	4.1723	8.234	4.1323
12	2.0525	0.0808	3.3088	6.53	5.2107
13	1.8278	0.072	2.624	5.178	6.5706
14	1.6277	0.0641	2.0809	4.107	8.2853
15	1.4495	0.0571	1.6502	3.257	10.4476
16	1.2908	0.0508	1.3087	2.583	13.1742
17	1.1495	0.0453	1.0378	2.048	16.6123
18	1.0237	0.0403	0.823	1.624	20.9478
19	0.9116	0.0359	0.6527	1.288	26.4147
20	0.8118	0.032	0.5176	1.022	33.3083
21	0.7229	0.0285	0.4105	0.81	42.0009
22	0.6438	0.0253	0.3255	0.642	52.9622
23	0.5733	0.0226	0.2582	0.509	66.7841
24	0.5106	0.0201	0.2047	0.404	84.2132
25	0.4547	0.0179	0.1624	0.32	106.1909
26	0.4049	0.0159	0.1288	0.254	133.9043
27	0.3606	0.0142	0.1021	0.202	168.8502
28	0.3211	0.0126	0.081	0.16	212.9161
29	0.2859	0.0113	0.0642	0.127	268.4823
30	0.2546	0.01	0.0509	0.101	338.5499
31	0.2268	0.0089	0.0404	0.08	426.9036
32	0.2019	0.008	0.032	0.063	538.3155
33	0.1798	0.0071	0.0254	0.05	678.8033
34	0.1601	0.0063	0.0201	0.04	855.9551
35	0.1426	0.0056	0.016	0.032	1,079.3395
36	0.127	0.005	0.0127	0.025	1,361.0219
37	0.1131	0.0045	0.01	0.02	1,716.217
38	0.1007	0.004	0.008	0.016	2,164.1097
39	0.0897	0.0035	0.0063	0.012	2,728.8919
40	0.0799	0.0031	0.005	0.01	3,441.0692

The full chart runs from AWG 0000 to 40. Open the chart in Elecmetric to look up the nearest AWG for a size in mm².

Assumptions

Solid round conductor
Standard AWG definition

Frequently asked questions

How do I find the diameter and area of an AWG wire?

d = 0.127 mm × 92^((36 − n) / 39); A = π d² / 4. Worked example: AWG 10 has 2.588 mm · 5.261 mm².

Does a smaller AWG number mean a thicker wire?

Yes. Gauge numbers run the opposite way to size: AWG 4 is much thicker than AWG 20, and each step of 6 gauges roughly halves the diameter.

Is AWG the same as SWG or a size in mm²?

No. AWG and SWG are different gauge systems with different sizes for the same number, and mm² is the cross-section area. Check which system a data sheet uses before converting. The AWG chart in Elecmetric looks up the nearest AWG for a size in mm².

How accurate are the results?

Every figure comes from the same tested engine as the Elecmetric calculators and is meant for estimating. Check design values against the standard and the equipment data you work to.

Formula guides: AWG and SWG Wire Gauge Converter Conductor Resistance Formulas and Temperature
All 78 conversions AWG to Diameter and Area in Elecmetric