Single Core Copper Wire Size Chart

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This table relates the 5 major metric and imperial wire size standards
to their corresponding wire diameters and cross sectional areas.

IEC International Electrotechnical Commission
JIS Japanese Industrial Standards
ANSI American National Standards Institute
BSI British Standards Institution
AWG American Wire Gauge
SWG British Standard Wire Gauge
(std) Value provided by standard
(calc) Calculated value (mostly)

Formulas for calculating resistance are given in the table footnotes.

ROUND SINGLE-CORE COPPER WIRE SIZE CHART
Actual Bare Wire Dimensions *				Wire Size Standard Designation **
(std) mil⌀	(calc) mil ²	(std) mm⌀	(calc) mm ²	IEC mm ²	IEC mm⌀	JIS mm⌀	ANSI AWG	BSI SWG
1404.8	1550000	35.682	1000	1000
1256.5	1240000	31.915	800.0	800
1115.0	976400	28.322	630.0	630
993.4	775100	25.231	500.0	500
888.5	620000	22.568	400.0	400
769.5	465100	19.544	300.0	300
688.2	372000	17.481	240.0	240
604.2	286700	15.348	185.0	185
580.0	264200	14.732	170.5				6/0
544.1	232500	13.820	150.0	150
516.5	209500	13.119	135.2				5/0
500.0	196400	12.700	126.7					7/0
486.6	186000	12.361	120.0	120
464.0	169100	11.786	109.1					6/0
460.0	166200	11.684	107.2				4/0
433.0	147300	10.998	95.00	95
432.0	146600	10.973	94.57					5/0
409.6	131800	10.404	85.01				3/0
400.0	125700	10.160	81.07					4/0
393.7	121700	10.000	78.54			10
372.0	108700	9.449	70.12					3/0
371.7	108500	9.441	70.00	70
364.8	104500	9.266	67.43				2/0
354.3	98590	9.000	63.62			9
348.0	95120	8.839	61.36					2/0
324.9	82910	8.252	53.48				1/0
324.0	82450	8.230	53.20					1/0
315.0	77930	8.000	50.27			8
314.1	77490	7.979	50.00	50
306.6	73830	7.787	47.62				0.5
300.0	70690	7.620	45.60					1
289.3	65730	7.348	42.41				1
279.5	61360	7.100	39.59		7.1
276.0	59830	7.010	38.60					2
275.6	59660	7.000	38.49			7
273.0	58540	6.934	37.76				1.5
263.8	54660	6.700	35.26		6.7
262.8	54240	6.676	35.00	35
257.6	52120	6.543	33.62				2
255.9	51430	6.500	33.18			6.5
252.0	49880	6.401	32.18					3
248.0	48310	6.300	31.17		6.3
243.1	46420	6.175	29.95				2.5
236.2	43820	6.000	28.27		6	6
232.0	42270	5.893	27.28					4
229.4	41330	5.827	26.67				3
222.1	38740	5.642	25.00	25
220.5	38190	5.600	24.63		5.6
216.5	36810	5.500	23.76			5.5
216.5	36810	5.499	23.75				3.5
212.0	35300	5.385	22.78					5
208.7	34210	5.300	22.06		5.3
204.3	32780	5.189	21.15				4
196.9	30450	5.000	19.64		5	5
192.8	29200	4.897	18.83				4.5
192.0	28950	4.877	18.68					6
187.0	27470	4.750	17.72		4.75
181.9	25990	4.620	16.76				5
177.7	24800	4.514	16.00	16
177.2	24660	4.500	15.90		4.5	4.5
176.0	24330	4.470	15.69					7
171.7	23150	4.361	14.94				5.5
167.3	21980	4.250	14.19		4.25
162.0	20610	4.115	13.30				6
160.0	20110	4.064	12.97					8
157.5	19480	4.000	12.57		4	4
152.9	18360	3.884	11.85				6.5
147.6	17110	3.750	11.05		3.75
144.3	16350	3.665	10.55				7
144.0	16290	3.658	10.51					9
140.5	15500	3.568	10.00	10
139.8	15350	3.550	9.898		3.55
137.8	14910	3.500	9.621			3.5
136.2	14570	3.459	9.397				7.5
131.9	13660	3.350	8.814		3.35
128.5	12970	3.264	8.367				8
128.0	12870	3.251	8.301					10
126.0	12470	3.200	8.042			3.2
124.0	12080	3.150	7.793		3.15
121.3	11560	3.081	7.455				8.5
118.1	10950	3.000	7.069		3	3
116.0	10570	2.946	6.816					11
114.4	10280	2.906	6.633				9
114.2	10240	2.900	6.605			2.9
110.2	9538	2.800	6.158		2.8	2.8
108.8	9297	2.764	6.000	6
108.0	9161	2.743	5.909				9.5
106.3	8875	2.700	5.726			2.7
104.3	8544	2.650	5.515		2.65
104.0	8495	2.642	5.482					12
102.4	8235	2.600	5.309			2.6
101.9	8155	2.588	5.260				10
98.43	7609	2.500	4.909		2.5	2.5
96.20	7268	2.443	4.687				10.5
94.49	7012	2.400	4.524			2.4
92.91	6780	2.360	4.374		2.36
92.00	6648	2.337	4.290					13
90.70	6461	2.304	4.169				11
90.55	6440	2.300	4.155			2.3
88.85	6200	2.257	4.000	4
88.19	6108	2.240	3.941		2.24
86.61	5892	2.200	3.801			2.2
85.60	5755	2.174	3.712				11.5
83.46	5471	2.120	3.530		2.12
82.68	5369	2.100	3.464			2.1
80.80	5128	2.052	3.307				12
80.00	5027	2.032	3.243					14
78.74	4869	2.000	3.142		2	2
76.30	4572	1.938	2.950				12.5
74.80	4394	1.900	2.835		1.9	1.9
72.00	4072	1.829	2.627				13
72.00	4072	1.829	2.627					15
70.87	3945	1.800	2.545		1.8	1.8
70.24	3875	1.784	2.500	2.5
67.90	3621	1.725	2.337				13.5
66.93	3518	1.700	2.270		1.7	1.7
64.10	3227	1.628	2.082				14
64.00	3217	1.626	2.077					16
62.99	3116	1.600	2.011		1.6	1.6
60.50	2875	1.537	1.855				14.5
59.06	2740	1.500	1.767		1.5	1.5
57.10	2561	1.450	1.651				15
56.00	2463	1.422	1.588					17
55.12	2386	1.400	1.539		1.4	1.4
54.41	2325	1.382	1.500	1.5
53.90	2282	1.369	1.472				15.5
51.97	2121	1.320	1.369		1.32
51.18	2057	1.300	1.327			1.3
50.80	2027	1.290	1.307				16
49.21	1902	1.250	1.227		1.25
48.00	1810	1.219	1.167					18
48.00	1810	1.219	1.167				16.5
47.24	1753	1.200	1.131			1.2
46.46	1695	1.180	1.094		1.18
45.30	1612	1.151	1.041				17
44.42	1550	1.128	1.000	1
44.09	1527	1.120	.9852		1.12
43.31	1473	1.100	.9503			1.1
42.70	1432	1.085	.9246				17.5
41.73	1368	1.060	.8825		1.06
40.30	1276	1.024	.8235				18
40.00	1257	1.016	.8107					19
39.37	1217	1.000	.7854		1	1
38.47	1162	.9772	.7500	.75
38.00	1134	.9650	.7314				18.5
37.40	1099	.9500	.7088		.95	.95
36.00	1018	.9144	.6567					20
35.90	1012	.9120	.6533				19
35.43	985.9	.9000	.6362		.9	.9
33.90	902.6	.8610	.5822				19.5
33.46	879.3	.8500	.5675		.85	.85
32.00	804.2	.8130	.5191				20
32.00	804.2	.8128	.5189					21
31.50	779.3	.8000	.5027		.8	.8
31.41	774.9	.7979	.5000	.5
30.20	716.3	.7670	.4620				20.5
29.53	684.9	.7500	.4418		.75	.75
28.50	638.0	.7240	.4117				21
28.00	615.8	.7112	.3973					22
27.95	613.6	.7100	.3959		.71
27.56	596.6	.7000	.3849			.7
27.39	589.2	.6956	.3800	.38
26.90	568.3	.6830	.3664				21.5
26.38	546.6	.6700	.3526		.67
25.90	526.9	.6580	.3400	.34
25.59	514.3	.6500	.3318			.65
25.30	502.7	.6430	.3247				22
24.80	483.1	.6300	.3117		.63
24.00	452.4	.6096	.2919					23
23.90	448.6	.6070	.2894				22.5
23.62	438.2	.6000	.28274		.6	.6
22.60	401.2	.5740	.2588				23
22.21	387.4	.5642	.2500	.25
22.05	381.9	.5600	.2463		.56
22.00	380.1	.5588	.2453					24
21.65	368.1	.5500	.2376			.55
21.30	21.30	.5410	.22987				23.5
20.87	342.1	.5300	.2206		.53
20.10	317.3	.5110	.2051				24
20.00	314.2	.5080	.2027					25
19.69	304.5	.5000	.1964		.5	.5
19.00	283.6	.4830	.1832				24.5
18.70	274.7	.4750	.1772		.475
18.00	254.5	.4572	.16417					26
17.90	251.7	.4550	.1626				25
17.72	246.6	.4500	.1590		.45	.45
16.90	224.3	.4290	.1446				25.5
16.73	219.8	.4250	.1419		.425
16.62	217.0	.4222	.1400	.14
16.40	211.2	.4166	.1363					27
15.90	198.6	.4040	.1282				26
15.75	194.8	.4000	.1257		.4	.4
15.00	176.7	.3810	.1140				26.5
14.80	172.0	.3759	.1110					28
14.77	171.3	.3750	.1105		.375
14.57	166.7	.3700	.1075			.37
14.20	158.4	.3610	.1024				27
13.98	153.5	.3550	.09898		.355
13.78	149.1	.3500	.09621			.35
13.60	145.3	.3454	.09370					29
13.40	141.0	.3400	.09080				27.5
13.33	139.6	.3385	.09000	.09
13.19	136.6	.3350	.08814		.335
12.60	124.7	.3200	.08042			.32
12.60	124.7	.3200	.08042				28
12.57	124.1	.3192	.08000	.08
12.40	120.8	.3150	.07793		.315
12.40	120.8	.3150	.07793					30
11.90	111.2	.3020	.07163				28.5
11.81	109.5	.3000	.07069		.3	.3
11.60	105.7	.2946	.06816					31
11.42	102.4	.2900	.06605			.29
11.30	100.3	.2870	.06469				29
11.02	95.38	.2800	.06158		.28	.28
10.80	91.60	.2743	.05909					32
10.63	88.75	.2700	.05726			.27
10.60	88.25	.2690	.05683				29.5
10.43	85.44	.2650	.05515		.265
10.24	82.35	.2600	.05309			.26
10.00	78.54	.2540	.05067				30
10.00	78.54	.2540	.05067					33
9.934	77.50	.2523	.05000	.05
9.843	76.10	.2500	.04909		.25	.25
9.500	70.88	.2410	.04562				30.5
9.449	70.12	.2400	.04524			.24
9.291	67.80	.2360	.04374		.236
9.200	66.48	.2337	.04290					34
9.055	64.40	.2300	.04155			.23
8.900	62.21	.2260	.04012				31
8.819	61.08	.2240	.03941		.224
8.661	58.92	.2200	.03801			.22
8.400	55.42	.2134	.03577					35
8.400	55.42	.2130	.03563				31.5
8.347	54.72	.2120	.03530		.212
8.311	54.25	.2111	.03500	.035
8.268	53.69	.2100	.03464			.21
8.000	50.27	.2030	.03237				32
7.874	48.69	.2000	.03142		.2	.2
7.600	45.37	.1930	.02926					36
7.500	44.18	.1910	.02865				32.5
7.480	43.94	.1900	.02835		.19	.19
7.100	39.59	.1800	.02545				33
7.087	39.45	.1800	.02545		.18	.18
6.800	36.32	.1727	.02343					37
6.700	35.26	.1700	.02270				33.5
6.693	35.18	.1700	.02270		.17	.17
6.300	31.17	.1600	.02011				34
6.299	31.16	.1600	.02011		.16	.16
6.000	28.27	.1524	.01824					38
5.906	27.40	.1500	.01767		.15	.15
5.900	27.34	.1500	.01767				34.5
5.600	24.63	.1420	.01584				35
5.512	23.86	.1400	.01539		.14	.14
5.300	22.06	.1350	.01431				35.5
5.200	21.24	.1321	.01371					39
5.197	21.21	.1320	.01369		.132
5.118	20.57	.1300	.01327			.13
5.000	19.64	.1270	.01267				36
4.921	19.02	.1250	.01227		.125
4.800	18.10	.1219	.01167					40
4.724	17.53	.1200	.01131			.12
4.700	17.35	.1190	.01112				36.5
4.646	16.95	.1180	.01094		.118
4.500	15.90	.1140	.01021				37
4.409	15.27	.1120	.009852		.112
4.400	15.21	.1118	.009817					41
4.331	14.73	.1100	.009503			.11
4.173	13.68	.1060	.008825		.106
4.200	13.85	.1070	.008992				37.5
4.000	12.57	.1020	.008171				38
4.000	12.57	.1016	.008107					42
3.937	12.17	.1000	.007854		.1	.1
3.740	10.99	.0950	.007088		.095
3.700	10.75	.0940	.006940				38.5
3.600	10.18	.0914	.006561					43
3.543	9.859	.0900	.006362		.09	.09
3.500	9.621	.0890	.006221				39
3.347	8.798	.0850	.005675		.085
3.300	8.553	.0840	.005542				39.5
3.200	8.042	.0813	.005191					44
3.150	7.793	.0800	.005027		.08	.08
3.100	7.548	.0790	.004902				40
3.000	7.069	.0760	.004537				40.5
2.953	6.849	.0750	.004418		.075
2.800	6.158	.0711	.003970					45
2.800	6.158	.0710	.003959				41
2.795	6.136	.0710	.003959		.071
2.756	5.966	.0700	.003849			.07
2.638	5.309	.0670	.003526		.067
2.600	5.309	.0660	.003421				41.5
2.500	4.909	.0640	.003217				42
2.480	4.831	.0630	.003117		.063
2.400	4.524	.0610	.002923					46
2.400	4.524	.0610	.002923				42.5
2.362	4.382	.0600	.002827		.060	.06
2.205	3.819	.0560	.002463		.056
2.200	3.801	.0560	.002463				43
2.100	3.464	.0530	.002206				43.5
2.087	3.421	.0530	.002206		.053
2.000	3.142	.0510	.002043				44
2.000	3.142	.0508	.002027					47
1.969	3.045	.0500	.001964		.05	.05
1.900	2.835	.0480	.001810				44.5
1.890	2.806	.0480	.001810		.048
1.760	2.433	.0447	.001569				45
1.662	2.170	.0422	.001399				45.5
1.600	2.011	.0406	.001295					48
1.575	1.948	.0400	.001257			.04
1.570	1.936	.0399	.001250				46
1.480	1.720	.0376	.001110				46.5
1.400	1.539	.0356	.0009954				47
1.318	1.364	.0335	.0008814				47.5
1.240	1.208	.0315	.0007793				48
1.200	1.131	.0305	.0007306					49
1.181	1.095	.0300	.0007069			.03
1.117	.9800	.0298	.0006975				48.5
1.110	.9677	.0282	.0006246				49
1.045	.8577	.0265	.0005515				49.5
1.000	.7854	.0254	.0005067					50
.990	.7698	.0251	.0004948				50
.984	.7605	.0250	.0004909			.025
.931	.6808	.0236	.0004374				50.5
.880	.6082	.0224	.0003941				51
.829	.5398	.0211	.0003497				51.5
.787	.4865	.0200	.0003142			.02
.780	.4778	.0198	.0003079				52
.738	.4278	.0187	.0002747				52.5
.700	.3849	.0178	.0002489				53
.657	.3390	.0167	.0002190				53.5
.620	.3019	.0157	.0001936				54
.585	.2688	.0149	.0001744				54.5
.550	.2376	.0140	.0001539				55
.521	.2132	.0132	.0001369				55.5
.490	.1886	.0124	.0001208				56
.464	.1691	.0118	.0001094				56.5
.438	.1507	.0111	.00009677				57
.413	.1340	.0105	.00008659				57.5
.390	.1195	.00991	.00007713				58
.368	.1064	.00935	.00006866				58.5
.347	.09457	.00882	.00006110				59
.328	.08450	.00833	.00005450				59.5
.309	.07499	.00786	.00004852				60
This table was double checked but accuracy is not guaranteed so use it at your own risk! Be aware that that 1550000 mil² = 1.55 inch² and .00004852 mm² = 48.52 μm² thanks! * Small discrepancies between mil and mm diameters is reflected in the relevant standards. ** Some defacto standard sizes are included alongside the associated technical standards.
Resistance of pure Cu wire at 20°C in ohms-per-1000m = 21.9528 ÷ wire-size-in-mm ² Resistance of pure Cu wire at 20°C in ohms-per-1000ft = 10371.4 ÷ wire-size-in-mil ²

Q: I want to report a problem:

Some of the dimensions are given in in only 3 significant digits while others are shown in 5.
Some of the mil sizes don't match the mm sizes in accordance with normal unit conversion factors.
Dimensions are all slightly out of whack compared to calculated sizes obtained from a wire size formula.

A: Okay grasshopper but...

Look at the official standard document to see how each specific wire size is specified.
While it is possible and perhaps likely that the above table contains some mistakes,
chances are that the anomaly you noticed is actually built into the official standard.
Some standards actually quote slightly discrepant values between mil and mm sizes.
Most standards specify tabular sizes instead of invoking a mathematical formula.
If you can prove that the issue is in fact real then please email me and I will fix it.

Safety, accuracy and completeness of information provided herein is not guaranteed,
so be inspired by it but do not use it as a basis for experimentation or other actions.

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