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    AWG American Wire Gauge Diameter and Resistance

    The AWG is a logarithmic scale, so given an know resistance or diameter for a certain gauge, you can quickly figure out the resistance and diameter of another gauge number, by addition and subtraction.

    Resistance:

    1. AWG 15 is 10 mohm/m.
    2. Adding 3 doubles the resistance, and subtracting 3 halves it.
    3. Adding 10 multiplies the resistance by 10, and subtracting 10 it divides by 10.

    Diameter:

    1. AWG 18 has a solid diameter of about 1mm
    2. Adding 6 halves the diameter, Subtracting 6 doubles the diameter
    3. Adding 20 divides the diameter by 10, and subtracting 20 multiplies the diameter by 10.
    AWG Chart
    AWG Number [Inch]
    for Solid
    Rod         		[mm]
    for Solid
    Rod         		[mm]
    for Solid
    Rod

    Resistance
    [Ohm/m]
    Copper
    (20 C,68 F)

    4/0 = 0000 0.460 11.7 107 0.000161
    3/0 = 000 0.410 10.4 85.0 0.000203
    2/0 = 00 0.365 9.26 67.4 0.000256
    1/0 = 0 0.325 8.25 53.5 0.000323
    1 0.289 7.35 42.4 0.000407
    2 0.258 6.54 33.6 0.000513
    3 0.229 5.83 26.7 0.000647
    4 0.204 5.19 21.1 0.000815
    5 0.182 4.62 16.8 0.00103
    6 0.162 4.11 13.3 0.00130
    7 0.144 3.66 10.5 0.00163
    8 0.128 3.26 8.36 0.00206
    9 0.114 2.91 6.63 0.00260
    10 0.102 2.59 5.26 0.00328
    11 0.0907 2.30 4.17 0.00413
    12 0.0808 2.05 3.31 0.00521
    13 0.0720 1.83 2.62 0.00657
    14 0.0641 1.63 2.08 0.00829
    15 0.0571 1.45 1.65 0.0104
    16 0.0508 1.29 1.31 0.0132
    17 0.0453 1.15 1.04 0.0166
    18 0.0403 1.02 0.823 0.0210
    19 0.0359 0.912 0.653 0.0264
    20 0.0320 0.812 0.518 0.0333
    21 0.0285 0.723 0.410 0.0420
    22 0.0253 0.644 0.326 0.0530
    23 0.0226 0.573 0.258 0.0668
    24 0.0201 0.511 0.205 0.0842
    25 0.0179 0.455 0.162 0.106
    26 0.0159 0.405 0.129 0.134
    27 0.0142 0.361 0.102 0.169
    28 0.0126 0.321 0.0810 0.213
    29 0.0113 0.286 0.0642 0.268
    30 0.0100 0.255 0.0509 0.339
    31 0.00893 0.227 0.0404 0.427
    32 0.00795 0.202 0.0320 0.538
    33 0.00708 0.180 0.0254 0.679
    34 0.00631 0.160 0.0201 0.856
    35 0.00562 0.143 0.0160 1.08
    36 0.00500 0.127 0.0127 1.36
    37 0.00445 0.113 0.0100 1.72
    38 0.00397 0.101 0.00797 2.16
    39 0.00353 0.0897 0.00632 2.73
    40 0.00314 0.0799 0.00501 3.44
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