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What is AWG - American Wire Gauge?

Used in the United States and other countries as a standard method of denoting wire diameter. The higher the number the thinner the wire. Thicker wire is generally capable of carrying larger amount of current over greater distances with less loss (though there are other things that cause current loss in wire). Sometimes the loss of cables is rated in Ohms per one thousand feet and for a particular type of wire the lower gauges (larger wires) have less resistance to current flow. (Sweetwater Archive)

AWG American Wire Gauge Table:
AWG  Diameter  Diameter  Square  Resistance  Resistance 
  mm  inch    mm2  ohm/km  ohm/1000 feet 
46 0,04   0,0013 13700  
44 0,05   0,0020 8750  
42 0,06   0,0028 6070  
41 0,07   0,0039 4460  
40 0,08   0,0050 3420  
39 0,09   0,0064 2700  
38 0,10 0,0040 0,0078 2190  
37 0,11 0,0045 0,0095 1810  
36 0,13 0.005 0,013 1300 445
35 0,14 0,0056 0,015 1120  
34 0,16 0.0063 0,020 844 280
33 0,18 0,0071 0,026 676  
32 0,20 0.008 0,031 547 174
30 0,25 0.01 0,049 351 113
28 0,33 0.013 0,08 232.0 70.8
27 0,36 0.018 0,096 178 54.4
26 0,41 0.016 0,13 137 43.6
25 0,45 0,0179 0,16 108  
24 0,51 0.02 0,20 87,5 27.3
22 0,64 0.025 0,33 51,7 16.8
20 0,81 0.032 0,50 34,1 10.5
18 1,02 0.04 0,82 21,9 6.6
16 1,29 0.051 1,3 13,0 4.2
14 1,63 0.064 2,0 8,54 2.6
13 1,80 0,0720 2,6 6,76  
12 2,05 0.081 3,3 5.4 1.7
10 2.59 0.102 5.26 3.4 1.0
8 3.73 0.147 8.00 2.2 0.67
6 4.67 0.184 13.6 1.5 0.47
4 5.90 0.232 21.73 0.8 0.24
2 7.42 0.292 34.65 0.5 0.15
1 8.33 0.328 43.42 0.4 0.12
0 9.35 0.368 55.10 0.31 0.096
00 10.52 0.414 69.46 0.25 0.077
000 11.79 0.464 83.23 0.2 0.062
0000 13.26 0.522 107.30 0.16 0.049


Metric Gauge  Diameter  Square  Resistance 
  mm    mm2  ohm/m 
5 0,5 0,20 0,0838
6 0,6 0,28 0,0582
8 0,8 0,5 0,0328
10 1,0 0,8 0,0210
14 1,4 1,54 0,0107
16 1,6 2,0 0,00819
20 2,0 3,14 0,00524
25 2,5 4,91 0,00335


US National Electrical Code
maximum Amperage
AWG Wire Size Two Current Carrying Conductors Three Current Carrying Conductors
  Ampere Ampere
18 7 10
16 10 13
14 15 18
12 20 25
10 25 30
8 35 40
6 45 55
4 60 70
2 80 95


Amperage for Power Extension Cords
(always uncoil the cord completely under oreration)
14 / 3 AWG Cable
Length Amperage
50' 15 A
100' 13 A
150' 8 A
200' 6 A
250' 5 A
300' 4 A
12 / 3 AWG Cable
Length Amperage
50' 15 A
100' 15 A
150' 13 A
200' 10 A
250' 7 A
300' 6 A
10 / 3 AWG Cable
Length Amperage
50' 15 A
100' 15 A
150' 15 A
200' 15 A
250' 13 A
300' 10 A


AWG / Amperage and Connectors
AWG max. Amperage Connector
0000 (4/0) 300 A CamLock
000 (3/0) 260 A CamLock
00 (2/0) 225 A CamLock
0 (1/0) 195 A CamLock
2 125 A C-Way (50')
4 90 A C-Way (50')
6 70 A Joy&Cabtire (25'&50')
8 50 A Joy&Cabtire (25'&50')
10 30 A Joy&Cabtire (25'&50')
12 20 A A.C. Wire (25'&50')
14 15 A A.C. Wire (25'&50')
16 10 A A.C. Wire


Amperage that is needed to heat up the insulation to a certain temperature (Copper Cable / different Insulation Materials) in free air (30°C)
AWG POLYPROPYLENE, POLYETHYLENE,
(high density) at 90°C		 PVC (irradiated), NYLON at 105°C KAPTON, TEFLON, SILICONE at 200°C
30 3 A 3 A 4 A
28 4 A 4 A 6 A
26 5 A 5 A 7 A
24 7 A 7 A 10 A
22 9 A 10 A 13 A
20 12 A 13 A 17 A
18 17 A 18 A 24 A
16 22 A 24 A 32 A
14 30 A 33 A 45 A
12 40 A 45 A 55 A
10 55 A 58 A 75 A
8 70 A 75 A 100 A
6 100 A 105 A 135 A
4 135 A 145 A 180 A
2 180 A 200 A 240 A
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