Details: Published: 02 December 2014; Hits: 25407

Wire gauge chart

There are many different wire gauge designations. AWG = American Wire Gauge, SWG = Imperial Standard Wire Gauge - (British legal standard), B&S = Brown & Sharpe, International standard wire sizes (IEC 60228) etc.

In the American Wire Gauge(AWG), diameters can be calculated by applying the formula:

D(AWG)=0.005·92^{((36-AWG)/39)} (inch).

For the 00, 000, 0000 etc. gauges is using: -1, -2, -3. This means that in American wire gauge every 6 gauge decrease gives a doubling of the wire diameter area, and every 3 gauge decrease doubles the wire cross sectional area. Just like "dB" in signal levels!
In the Metric Gauge scale, the gauge is 10 times the diameter in millimeters, so a 50 gauge metric wire would be 5 mm in diameter.

For more information about Wire characteristics see here (with selecting the necessary wire size)

Note that in AWG the diameter goes up as the gauge goes down metric is the opposite. Probably because of this confusion, most of the time metric sized wire is specified in millimeters rather than metric gauges.

**American Wire Gauge(AWG)chart**
AWG	Diameter Inches	Diameter mm	Ohms per 1000 ft	Ohms per km	Maximum amps for chassis wiring	Maximum amps for power transmission
OOOO	0.46	11.684	0.049	0.16072	380	302
OOO	0.4096	10.40384	0.0618	0.202704	328	239
OO	0.3648	9.26592	0.0779	0.255512	283	190
0	0.3249	8.25246	0.0983	0.322424	245	150
1	0.2893	7.34822	0.1239	0.406392	211	119
2	0.2576	6.54304	0.1563	0.512664	181	94
3	0.2294	5.82676	0.197	0.64616	158	75
4	0.2043	5.18922	0.2485	0.81508	135	60
5	0.1819	4.62026	0.3133	1.027624	118	47
6	0.162	4.1148	0.3951	1.295928	101	37
7	0.1443	3.66522	0.4982	1.634096	89	30
8	0.1285	3.2639	0.6282	2.060496	73	24
9	0.1144	2.90576	0.7921	2.598088	64	19
10	0.1019	2.58826	0.9989	3.276392	55	15
11	0.0907	2.30378	1.26	4.1328	47	12
12	0.0808	2.05232	1.588	5.20864	41	9.3
13	0.072	1.8288	2.003	6.56984	35	7.4
14	0.0641	1.62814	2.525	8.282	32	5.9
15	0.0571	1.45034	3.184	10.44352	28	4.7
16	0.0508	1.29032	4.016	13.17248	22	3.7
17	0.0453	1.15062	5.064	16.60992	19	2.9
18	0.0403	1.02362	7.085	20.9428	16	2.3
19	0.0359	0.91186	8.051	26.40728	14	1.8
20	0.032	0.8128	10.15	33.292	11	1.5
21	0.0285	0.7239	12.8	41.984	9	1.2
22	0.0254	0.64516	16.14	52.9392	7	0.92
23	0.0226	0.57404	20.36	66.7808	4.7	0.729
24	0.0201	0.51054	25.67	84.1976	3.5	0.577
25	0.0179	0.45466	32.37	106.1736	2.7	0.457
26	0.0159	0.40386	40.81	133.8568	2.2	0.361
27	0.0142	0.36068	51.47	168.8216	1.7	0.288
28	0.0126	0.32004	64.9	212.872	1.4	0.226
29	0.0113	0.28702	81.83	268.4024	1.2	0.182
30	0.01	0.254	103.2	338.496	0.86	0.142
31	0.0089	0.22606	130.1	426.728	0.7	0.113
32	0.008	0.2032	164.1	538.248	0.53	0.091
33	0.0071	0.18034	206.9	678.632	0.43	0.072
34	0.0063	0.16002	260.9	855.752	0.33	0.056
35	0.0056	0.14224	329	1079.12	0.27	0.044
36	0.005	0.127	414.8	1360	0.21	0.035
37	0.0045	0.1143	523.1	1715	0.17	0.0289
38	0.004	0.1016	659.6	2163	0.13	0.0228
39	0.0035	0.0889	831.8	2728	0.11	0.0175
40	0.0031	0.07874	1049	3440	0.09	0.0137

**British SWG (Standard Wire Gauge) chart**
SWG	Diameter Inches	Diameter mm	SWG	Diameter Inches	Diameter mm
7/0	0.500	12.700	26	0.018	0.4572
6/0	0.464	11.786	27	0.0164	0.4166
5/0	0.432	10.973	28	0.0148	0.3759
4/0	0.400	10.160	29	0.0136	0.3454
3/0	0.372	9.449	30	0.0124	0.3150
2/0	0.348	8.839	31	0.0116	0.2946
0	0.324	8.230	32	0.0108	0.2743
1	0.300	7.620	33	0.0100	0.2540
2	0.276	7.010	34	0.0092	0.2337
3	0.252	6.401	35	0.0084	0.2134
4	0.232	5.893	36	0.0076	0.1930
5	0.212	5.385	37	0.0068	0.1727
6	0.192	4.877	38	0.0060	0.1524
7	0.176	4.470	39	0.0052	0.1321
8	0.160	4.064	40	0.0048	0.1219
9	0.144	3.658	41	0.0044	0.1118
10	0.128	3.251	42	0.004	0.1016
11	0.116	2.946	43	0.0036	0.0914
12	0.104	2.642	44	0.0032	0.0813
13	0.092	2.337	45	0.0028	0.0711
14	0.080	2.032	46	0.0024	0.0610
15	0.072	1.829	47	0.0020	0.0508
16	0.064	1.626	48	0.0016	0.0406
17	0.056	1.422	49	0.0012	0.0305
18	0.048	1.219	50	0.0010	0.0254
19	0.040	1.016
20	0.036	0.914
21	0.032	0.813
22	0.028	0.711
23	0.024	0.610
24	0.022	0.559
25	0.020	0.5080

**Metric Wire Gauge (IEC 60228)**
Wire diameter, mm	Cross-section mm²	Resistance of wire with 1Km lenghth at t=20°C, Ohm	Permissible current load according to standard 2.5A/mm², A
0,05	0,00196	9290	0,0049
0,06	0,00283	6440	0,0071
0,07	0,00385	4730	0,0097
0,08	0,00502	2630	0,0126
0,09	0,00636	2860	0,0159
0,10	0,00785	2240	0,0196
0,11	0,00950	1850	0,0238
0,12	0,01131	1550	0,0283
0,13	0,01327	1320	0,0333
0,14	0,01539	1140	0,0385
0,15	0,01767	984	0,0442
0,16	0,02011	873	0,0503
0,17	0,02270	773	0,0568
0,18	0,02545	688	0,0638
0,19	0,02835	618	0,0710
0,20	0,03142	558	0,0785
0,21	0,03464	507	0,0866
0,23	0,04165	423	0,1041
0,25	0,04909	357	0,1241
0,27	0,05726	605	0,1435
0,29	0,06605	266	0,1650
0,31	0,07548	233	0,1890
0,33	0,08553	205	0,2140
0,35	0,09621	182	0,2405
0,38	0,11341	155	0,283
0,41	0,13202	133	0,330
0,44	0,15205	115	0,380
0,47	0,17349	101	0,433
0,49	0,18848	93,1	0,478
0,51	0,20428	85,9	0,510
0,53	0,22051	79,3	0,533
0,55	0,23758	73,9	0,595
0,57	0,25565	68,4	0,643
0,59	0,28740	64,3	0,683
0,62	0,30191	57,8	0,755
0,64	0,32170	54,6	0,805
0,67	0,35256	49,7	0,893
0,69	0,37395	46,9	0,935
0,72	0,40715	43,0	1,018
0,74	0,43008	40,8	1,075
0,77	0,46656	37,6	1,166
0,80	0,50265	34,9	1,260
0,83	0,54060	32,4	1,350
0,86	0,58088	32	1,450
0,90	0,63617	27,5	1,590
0,93	0,67929	25,8	1,690
0,96	0,73282	24,2	1,810
1,00	0,78540	22,4	1,960

Comments (2)

Comments

Samim SK

2015-07-26 05:03

Heavy helpful. Thanks for design author.

Quote

Mehdi_es73

2017-02-12 11:24

Hi,
what is the reference of these tables?
actually, I want to design a multilayer air core inductor on a rectangular former(made of plexiglass) and I want to choose my wire but I don't know what is the proper diameter for it:(
I want to have 2A current flow continuously and obviously, don't melt or disfigure my former. Can you help me with this ?

Quote

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