Wire Sizes

Copper Wire Table: AWG to Metric


American Wire Gauge Number (B&S)
Ohms per Meter at 20°C
Ohms Per Foot at 20°C
Meters per Ohm at 20°C
Nominal Diameter in mm *
Nominal Diameter in Inches *
Nominal Circular Mils
Maximum
Ampacity
Rating
Closest Metric Wire
1,000 MCM
.00003402
.00001037
29,392.5
29.26
1.152
1,000,000
   
750 MCM
.00004681
.00001427
21,364.6
25.35
.998
750,000
   
500 MCM
.00006804
.00002074
14,696.2
20.6
.813
500,000
   
350 MCM
.00009721
.00002963
10,286.9
17.3
.681
350,000
   
300 MCM
.00011341
.00003456
7,458.4
16.0
.630
300,000
   
250 MCM
.00013609
.00004148
7,348.1
14.6
.575
250,000
   
0000
.00016080
.00004901
6,219.0
13.4
.528
211,600
360
 
000
.00020276
.00006180
4,932.0
11.9
.470
167,800
   
00
.00025569
.00007793
3,911.0
10.6
.419
133,100
265
 
0
.00032237
.00009827
3,102.0
9.5
.373
105,600
170
 
1
.00040650
.0001239
2,460.0
8.4
.332
83,690
150
 
2
.00051256
.0001563
1,951.0
7.4
.292
66,360
130
 
3
.00064633
.0001970
1,547.2
6.6
.260
52,620
   
4
.00081500
.0002485
1,227.0
5.8
.232
41,740
95
 
6
.00129617
.0003951
771.5
4.7
.184
26,240
75
 
8
.00206100
.0006282
485.2
3.7
.146
16,510
55
 
10
.00328839
.0009989
305.1
(2.588) 2.9
(.1019) .116
10,380
40
 
12
.00521100
.001588
191.9
(2.053) 2.3
(.0808) .092
6,530
30
 
14
.00828500
.002525
120.7
(1.628) 1.8
(.0641) .073
4,110
25
 
Notes
* Stranded wire sizes. Solid wire sizes are shown in brackets.
Copper wire resistance is 10.37 ohms per circular mil per foot.
Aluminum wire resistance is 16.06 ohms per circular mil per foot.
To convert feet to meters or ohms per foot to ohms per meter, divide by .3048.
MCM is thousand circular mils. Circular mils is a measurement of area:
1 CM = .000001 square inch.
1 MCM = .001 square inch.
This chart has been compiled from several sources. Some data such as ohms per meter, ohms per foot and nominal diameter in mm have been calculated from equivalents and constants.

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