AWG ↔ mm² Converter

Free Tool

Enter any one of AWG gauge, cross-sectional area (mm²) or conductor diameter (mm) — the other two update live and snap to the nearest standard gauge. Built for matching US/imperial specs (AWG) with metric (mm²) cable selections.

AWG gauge

AWG (4/0, 3/0, 1/0, 1–40)

Area (mm²)

square millimetres (metric)

Conductor diameter (mm)

single conductor diameter

Tip: click any row in the table below to fill it in.

Conductor diameter (inch): —

Standard AWG reference table (click a row to fill)

AWG	Diameter (mm)	Diameter (inch)	Area (mm²)	Suggested mm²
4/0	11.684	0.4600	107.22	120
3/0	10.405	0.4096	85.03	95
2/0	9.266	0.3648	67.43	70
1/0	8.251	0.3249	53.48	70
1	7.348	0.2893	42.41	50
2	6.544	0.2576	33.63	35
3	5.827	0.2294	26.67	35
4	5.189	0.2043	21.15	25
5	4.621	0.1819	16.77	25
6	4.115	0.1620	13.30	16
7	3.665	0.1443	10.55	16
8	3.264	0.1285	8.366	10
9	2.906	0.1144	6.634	10
10	2.588	0.1019	5.261	6
11	2.305	0.0907	4.172	6
12	2.053	0.0808	3.309	4
13	1.828	0.0720	2.624	4
14	1.628	0.0641	2.081	2.5
15	1.450	0.0571	1.650	2.5
16	1.291	0.0508	1.309	1.5
17	1.150	0.0453	1.038	1.5
18	1.024	0.0403	0.823	1
19	0.912	0.0359	0.653	0.75
20	0.812	0.0320	0.518	0.75
21	0.723	0.0285	0.410	0.5
22	0.644	0.0253	0.326	0.5
23	0.573	0.0226	0.258	0.5
24	0.511	0.0201	0.205	0.5
25	0.455	0.0179	0.162	0.5
26	0.405	0.0159	0.129	0.5
27	0.361	0.0142	0.102	0.5
28	0.321	0.0126	0.081	0.5
29	0.286	0.0113	0.064	0.5
30	0.255	0.0100	0.051	0.5
31	0.227	0.0089	0.040	0.5
32	0.202	0.0080	0.032	0.5
33	0.180	0.0071	0.025	0.5
34	0.160	0.0063	0.020	0.5
35	0.143	0.0056	0.016	0.5
36	0.127	0.0050	0.013	0.5
37	0.113	0.0045	0.010	0.5
38	0.101	0.0040	0.008	0.5
39	0.090	0.0035	0.006	0.5
40	0.080	0.0031	0.005	0.5

Suggested mm² = the smallest standard IEC 60228 conductor size that is ≥ the AWG's actual area, so the metric cable's ampacity is never below the original AWG.

What's the difference between AWG and mm²?

AWG (American Wire Gauge) sizes wire by gauge number — the smaller the number, the thicker the wire (4/0 is the thickest common size, 40 the thinnest). mm² is the conductor cross-section used in metric/IEC standards — larger number means thicker. They describe the same wire in two different systems; this tool converts between them directly.

Why does entering mm² show "nearest standard gauge"?

mm² is a continuous value while AWG is a discrete set of standard sizes. When you enter a non-standard area (e.g. 5 mm²), the tool back-calculates the AWG index and snaps to the nearest real size (≈ 10 AWG) so you can pick a cable that actually exists.

What AWG matches common cable sizes?

Rough guide: 2.5 mm² ≈ 13 AWG, 6 mm² ≈ 10 AWG, 16 mm² ≈ 6 AWG, 25 mm² ≈ 4 AWG, 35 mm² ≈ 2 AWG, 50 mm² ≈ 1 AWG, 70 mm² ≈ 2/0, 95 mm² ≈ 3/0, 120 mm² ≈ 4/0. Always trust the live result above.

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