# Common Wire Gauges

The common U.S. wire gauges (called AWG gauges) refer to sizes of copper wire. The resistivity of copper at 20 C is about

This table uses this value of resistivity, but it is known to vary by a few percent based on purity and process of manufacture.

 AWG wire size (solid) Diameter (inches) Resistance per 1000 ft (ohms) Resistance per1000 m (ohms) 24 0.0201 25.67 84.2 22 0.0254 16.14 52.7 20 0.0320 10.15 33.2 18 0.0403 6.385 20.9 16 0.0508 4.016 13.2 14 0.0640 2.525 8.28 12 0.0808 1.588 5.21 10 0.1019 0.999 3.28
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# American Wire Gages (AWG) Sizes and Resistances

 AWG wire size (solid) Area CM* Resistance per 1000 ft (ohms) @ 20 C Diameter(inches) Maximum current**(amperes) 0000 211600 0.049 0.46 380 000 167810 0.0618 0.40965 328 00 133080 0.078 0.3648 283 0 105530 0.0983 0.32485 245 1 83694 0.124 0.2893 211 2 66373 0.1563 0.25763 181 3 52634 0.197 0.22942 158 4 41742 0.2485 0.20431 135 5 33102 0.3133 0.18194 118 6 26250 0.3951 0.16202 101 7 20816 0.4982 0.14428 89 8 16509 0.6282 0.12849 73 9 13094 0.7921 0.11443 64 10 10381 0.9989 0.10189 55 11 8234 1.26 0.09074 47 12 6529 1.588 0.0808 41 13 5178.4 2.003 0.07196 35 14 4106.8 2.525 0.06408 32 15 3256.7 3.184 0.05707 28 16 2582.9 4.016 0.05082 22 17 2048.2 5.064 0.04526 19 18 1624.3 6.385 0.0403 16 19 1288.1 8.051 0.03589 14 20 1021.5 10.15 0.03196 11 21 810.1 12.8 0.02846 9 22 642.4 16.14 0.02535 7 23 509.45 20.36 0.02257 4.7 24 404.01 25.67 0.0201 3.5 25 320.4 32.37 0.0179 2.7 26 254.1 40.81 0.01594 2.2 27 201.5 51.47 0.0142 1.7 28 159.79 64.9 0.01264 1.4 29 126.72 81.83 0.01126 1.2 30 100.5 103.2 0.01002 0.86 31 79.7 130.1 0.00893 0.7 32 63.21 164.1 0.00795 0.53 33 50.13 206.9 0.00708 0.43 34 39.75 260.9 0.0063 0.33 35 31.52 329 0.00561 0.27 36 25 414.8 0.005 0.21 37 19.83 523.1 0.00445 0.17 38 15.72 659.6 0.00396 0.13 39 12.47 831.8 0.00353 0.11 40 9.89 1049 0.00314 0.09

The U.S. wire gauges (called AWG gauges) refer to sizes of copper wire. This table corresponds to a resistivity of

for copper at 20 C. This table uses this value of resistivity, but it is known to vary by a few percent based on purity and process of manufacture.

*The AWG system states areas of round copper wires in "circular mils", which is the square of the diameter in mils. 1 mil =.001 inch.

This data from Floyd, Electric Circuit Fundamentals, 2nd Ed.

**Maximum current for chassis wiring. Data from Handbook of Electronic Tables and Formulas for American Wire Gauge. The maximum current for power transmission is less.

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Floyd
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