: : AWG NEMA / IEC Metric Standard Size Chart
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AWG (American Wire Gauge)

AWG numbers follow a mathematical formulation devised by Brown and Sharpe in 1855. The AWG designation corresponds to the number of steps by which the wire is drawn. (18 AWG is smaller than 10 AWG, therefore is drawn more times to obtain a smaller cross sectional area.) According to the "Standard Handbook for Electrical Engineers" (Fink and Beaty) 'gauge' is the American Wire Gauge also known as the Brown & Sharpe gauge, which is the standard for which American engineers adhere.
AWG began at 4/0 wire with a diameter of 0.46" and the next lower wire size was derived by multiplying the diameter by 0.890526. These then became tabulated into what we today call the AWG; ranging down to 40 gauge wire at 0.003" in diameter. The primary concern in a mechanical standard is for electrical conductors and current carrying capacity (driven by resistance).
To protect engineers from lawsuits and physical harm a resistance measurement system was implemented to certify that all wire produced in the United States met the DC resistance specifications. The process of measuring the DC resistance is known as the 2-terminal method.

AWG
SIZE
NEMA
Nominal Diameter
Inches / MM
IEC R-20
Series MM
  AWG
SIZE
NEMA
Nominal Diameter
Inches / MM
IEC R-20
Series MM
4/0 0.4600 11.684 -   27 0.0142 0.361 0.355
3/0 0.4096 10.404 -   28 0.0126 0.320 0.315
2/0 0.3648 9.266 -   29 0.0113 0.287 0.280
1/0 0.3249 8.252 -   30 0.0100 0.254 0.250
1 0.2893 7.348 -   31 0.0089 0.226 0.224
2 0.2576 6.543 -   32 0.0080 0.203 0.200
3 0.2294 5.827 -   33 0.0071 0.180 0.180
4 0.2043 5.189 5.000   34 0.0063 0.160 0.160
5 0.1819 4.620 4.500   35 0.0056 0.142 0.140
6 0.1620 4.115 4.000   36 0.0050 0.127 0.125
7 0.1443 3.665 3.550   37 0.0045 0.114 0.112
8 0.1285 3.264 3.150   38 0.0040 0.102 0.100
9 0.1144 2.906 2.800   39 0.0035 0.089 0.090
10 0.1019 2.588 2.500   40 0.0031 0.079 0.080
11 0.0907 2.304 2.240   41 0.0028 0.071 0.071
12 0.0808 2.052 2.000   42 0.0025 0.064 0.063
13 0.0720 1.829 1.800   43 0.0022 0.056 0.056
14 0.0641 1.628 1.600   44 0.0020 0.051 0.050
15 0.0571 1.450 1.400   45 0.00176 0.0447 0.045
16 0.0508 1.290 1.250   46 0.00157 0.0399 0.040
17 0.0453 1.151 1.120   47 0.00140 0.0356 0.035
18 0.0403 1.024 1.000   48 0.00124 0.0315 0.031
19 0.0359 0.912 0.900   49 0.00111 0.0282 0.028
20 0.0320 0.813 0.800   50 0.00099 0.0251 0.025
21 0.0285 0.724 0.710   51 0.00088 0.0224 0.022
22 0.0253 0.643 0.630   52 0.00078 0.0198 0.020
23 0.0226 0.574 0.560   53 0.00070 0.0178 0.0187
24 0.0201 0.511 0.500   54 0.00062 0.0157 0.0157
25 0.0179 0.455 0.450   55 0.00055 0.0140 0.0140
26 0.0159 0.404 0.400   56 0.00049 0.0124 0.0124
AWG
SIZE
NEMA
Nominal Diameter
Inches / MM
IEC R-20
Series MM
  AWG
SIZE
NEMA
Nominal Diameter
Inches / MM
IEC R-20
Series MM
  * Information to be used as guide only. *
 
Version 4.3.3
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