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Wire Gauge Table - Kingsing Machinery Co., Limited

American wire gauge (AWG), also known as the Brown & Sharpe wire gauge, is a standardized wire gauge system used since 1857 predominantly in North America for the diameters of round, solid, nonferrous, electrically conducting wire. Dimensions of the wires are given in ASTM standard B 258. The cross-sectional area of each gauge is an important factor for determining its current-carrying capacity.

Increasing gauge numbers denote decreasing wire diameters, which is similar to many other non-metric gauging systems such as SWG. This gauge system originated in the number of drawing operations used to produce a given gauge of wire. Very fine wire (for example, 30 gauge) required more passes through the drawing dies than 0 gauge wire did. Manufacturers of wire formerly had proprietary wire gauge systems; the development of standardized wire gauges rationalized selection of wire for a particular purpose.

The AWG tables are for a single, solid, round conductor. The AWG of a stranded wire is determined by the cross-sectional area of the equivalent solid conductor. Because there are also small gaps between the strands, a stranded wire will always have a slightly larger overall diameter than a solid wire with the same AWG.

In the American Wire Gauge (AWG), diameters can be calculated by applying the formula:

D(AWG)=.005·92((36-AWG)/39) inch.

For the 00, 000, 0000 etc. gauges you use -1, -2, -3, which makes more sense mathematically than "double nought." This means that in American wire gage every 6 gauge decrease gives a doubling of the wire diameter, and every 3 gauge decrease doubles the wire cross sectional area. Similar to dB in signal and power levels. An approximate but accurate enough form of this formula contributed by Mario Rodriguez is:

D = .460 * (57/64)(awg +3) or D = .460 * (0.890625)(awg +3).

Wire diameter calculations

The n gauge wire diameter dn in inches (in) is equal to 0.005in times 92 raised to the power of 36 minus gauge number n, divided by 39:

dn (in) = 0.005 in × 92(36-n)/39

The n gauge wire diameter dn in millimeters (mm) is equal to 0.127mm times 92 raised to the power of 36 minus gauge number n, divided by 39:

dn (mm) = 0.127 mm × 92(36-n)/39

Wire cross sectional area calculations

The n gauge wire's cross sercional area An in kilo-circular mils (kcmil) is equal to 1000 times the square wire diameter d in inches (in):

An (kcmil) = 1000×dn2= 0.025 in2 × 92(36-n)/19.5

The n gauge wire's cross sercional area An in square inches (in2) is equal to pi divided by 4 times the square wire diameter d in inches (in):

An (in2) = (π/4)×dn2= 0.000019635 in2 × 92(36-n)/19.5

The n gauge wire's cross sercional area Anin square millimeters (mm2) is equal to pi divided by 4 times the square wire diameter d in millimeters (mm):

An (mm2) = (π/4)×dn2= 0.012668 mm2 × 92(36-n)/19.5

Wire resistance calculations

The n gauge wire resistance R in ohms per kilofeet (Ω/kft) is equal to 0.3048×1000000000 times the wire's resistivity ρ in ohm-meters (Ω·m) divided by 25.42 times the cross sectional area An in square inches (in2):

Rn (Ω/kft) = 0.3048 × 109 × ρ(Ω·m) / (25.42× An (in2))

The n gauge wire resistance R in ohms per kilometer (Ω/km) is equal to 1000000000 times the wire's resistivity ρ in ohm-meters (Ω·m) divided by the cross sectional area An in square millimeters (mm2):

Rn (Ω/km) = 109× ρ(Ω·m) / An (mm2)

Tables of AWG wire sizes

Wire Size SWG AWG BWG
Inch MM SQMM Inch MM SQMM Inch MM SQMM
4/0 0.4 10.16 81.073 0.46 11.68 107.145 0.454 11.53 104.411
3/0 0.372 9.45 70.138 0.409 10.41 85.112 0.425 10.8 91.608
2/0 0.348 8.84 61.375 0.365 9.27 67.491 0.38 9.65 73.138
1/0 0.324 8.23 53.197 0.325 8.25 53.456 0.34 8.64 58.629
1 0.3 7.62 45.603 0.289 7.35 42.429 0.3 7.62 45.603
2 0.276 7.01 38.594 0.258 6.54 33.592 0.283 7.21 40.828
3 0.252 6.4 32.169 0.229 5.83 26.694 0.259 6.58 34.004
4 0.232 5.89 27.247 0.204 5.19 21.155 0.238 6.05 28.747
5 0.212 5.38 22.732 0.182 4.62 16.763 0.22 5.59 24.542
6 0.192 4.88 18.703 0.162 4.11 13.267 0.203 5.16 20.911
7 0.176 4.47 15.692 0.144 3.66 10.52 0.179 4.57 16.402
8 0.16 4.06 12.946 0.128 3.26 8.346 0.164 4.19 13.788
9 0.144 3.66 10.52 0.114 2.9 6.605 0.147 3.76 11.103
10 0.128 3.25 8.295 0.102 2.59 5.268 0.134 3.4 9.079
11 0.116 2.95 6.834 0.091 2.3 4.154 0.12 3.05 7.306
12 0.104 2.64 5.473 0.081 2.05 3.3 0.109 2.77 6.026
13 0.092 2.34 4.3 0.072 1.83 2.63 0.095 2.41 4.561
14 0.081 2.03 3.236 0.064 1.63 2.086 0.083 2.11 3.496
15 0.072 1.83 2.63 0.057 1.45 1.651 0.072 1.83 2.63
16 0.064 1.63 2.086 0.051 1.29 1.306 0.065 1.65 2.086
17 0.056 1.42 1.583 0.045 1.15 1.038 0.058 1.47 1.697
18 0.048 1.22 1.168 0.04 1.02 0.817 0.049 1.24 1.207
19 0.04 1.02 0.817 0.036 0.91 0.65 0.042 1.07 0.899
20 0.036 0.92 0.664 0.032 0.81 0.515 0.035 0.89 0.58
21 0.032 0.81 0.515 0.028 0.72 0.407 0.031 0.81 0.515
22 0.028 0.71 0.395 0.025 0.64 0.321 0.028 0.71 0.395
23 0.024 0.61 0.292 0.023 0.57 0.255 0.025 0.64 0.321
24 0.023 0.56 0.246 0.02 0.51 0.204 0.023 0.56 0.246
25 0.02 0.51 0.204 0.018 0.45 0.159 0.02 0.51 0.204
26 0.018 0.46 0.166 0.016 0.4 0.125 0.018 0.46 0.166
27 0.016 0.41 0.132 0.014 0.36 0.101 0.016 0.41 0.132
28 0.014 0.38 0.101 0.013 0.32 0.08 0.0135 0.356 0.995
29 0.013 0.35 0.096 0.011 0.29 0.066 0.013 0.33 0.855
30 0.012 0.305 0.073 0.01 0.25 0.049 0.012 0.305 0.073
31 0.011 0.29 0.066 0.09 0.229 0.041 0.01 0.254 0.05
32 0.0106 0.27 0.057 0.008 0.203 0.032 0.009 0.229 0.041
33 0.01 0.254 0.05 0.007 0.178 0.024 0.008 0.203 0.032
34 0.009 0.229 0.041 0.0063 0.16 0.02 0.007 0.178 0.024
35 0.008 0.203 0.032 0.0056 0.14 0.015 0.005 0.127 0.012
36 0.007 0.178 0.024 0.005 0.127 0.012 0.004 0.102 0.008
37 0.0067 0.17 0.022 0.0044 0.11 0.009


38 0.006 0.15 0.017 0.004 0.102 0.008


39 0.005 0.127 0.012 0.0035 0.09 0.006


40 0.0047 0.12 0.011 0.0031 0.08 0.005


American Wire Gauge (AWG) Cable / Conductor Sizes and Properties

AWG Diameter
[inches]
Diameter
[mm]
Area
[mm2]
Resistance
[Ohms / 1000 ft]
Resistance
[Ohms / km]
Max Current
[Amperes]
Max Frequency
for 100% skin depth
0000 (4/0) 0.46 11.684 107 0.049 0.16072 302 125 Hz
000 (3/0) 0.4096 10.40384 85 0.0618 0.202704 239 160 Hz
00 (2/0) 0.3648 9.26592 67.4 0.0779 0.255512 190 200 Hz
0 (1/0) 0.3249 8.25246 53.5 0.0983 0.322424 150 250 Hz
1 0.2893 7.34822 42.4 0.1239 0.406392 119 325 Hz
2 0.2576 6.54304 33.6 0.1563 0.512664 94 410 Hz
3 0.2294 5.82676 26.7 0.197 0.64616 75 500 Hz
4 0.2043 5.18922 21.2 0.2485 0.81508 60 650 Hz
5 0.1819 4.62026 16.8 0.3133 1.027624 47 810 Hz
6 0.162 4.1148 13.3 0.3951 1.295928 37 1100 Hz
7 0.1443 3.66522 10.5 0.4982 1.634096 30 1300 Hz
8 0.1285 3.2639 8.37 0.6282 2.060496 24 1650 Hz
9 0.1144 2.90576 6.63 0.7921 2.598088 19 2050 Hz
10 0.1019 2.58826 5.26 0.9989 3.276392 15 2600 Hz
11 0.0907 2.30378 4.17 1.26 4.1328 12 3200 Hz
12 0.0808 2.05232 3.31 1.588 5.20864 9.3 4150 Hz
13 0.072 1.8288 2.62 2.003 6.56984 7.4 5300 Hz
14 0.0641 1.62814 2.08 2.525 8.282 5.9 6700 Hz
15 0.0571 1.45034 1.65 3.184 10.44352 4.7 8250 Hz
16 0.0508 1.29032 1.31 4.016 13.17248 3.7 11 k Hz
17 0.0453 1.15062 1.04 5.064 16.60992 2.9 13 k Hz
18 0.0403 1.02362 0.823 6.385 20.9428 2.3 17 kHz
19 0.0359 0.91186 0.653 8.051 26.40728 1.8 21 kHz
20 0.032 0.8128 0.518 10.15 33.292 1.5 27 kHz
21 0.0285 0.7239 0.41 12.8 41.984 1.2 33 kHz
22 0.0254 0.64516 0.326 16.14 52.9392 0.92 42 kHz
23 0.0226 0.57404 0.258 20.36 66.7808 0.729 53 kHz
24 0.0201 0.51054 0.205 25.67 84.1976 0.577 68 kHz
25 0.0179 0.45466 0.162 32.37 106.1736 0.457 85 kHz
26 0.0159 0.40386 0.129 40.81 133.8568 0.361 107 kHz
27 0.0142 0.36068 0.102 51.47 168.8216 0.288 130 kHz
28 0.0126 0.32004 0.081 64.9 212.872 0.226 170 kHz
29 0.0113 0.28702 0.0642 81.83 268.4024 0.182 210 kHz
30 0.01 0.254 0.0509 103.2 338.496 0.142 270 kHz
31 0.0089 0.22606 0.0404 130.1 426.728 0.113 340 kHz
32 0.008 0.2032 0.032 164.1 538.248 0.091 430 kHz
33 0.0071 0.18034 0.0254 206.9 678.632 0.072 540 kHz
34 0.0063 0.16002 0.0201 260.9 855.752 0.056 690 kHz
35 0.0056 0.14224 0.016 329 1079.12 0.044 870 kHz
36 0.005 0.127 0.0127 414.8 1360 0.035 1100 kHz
37 0.0045 0.1143 0.01 523.1 1715 0.0289 1350 kHz
38 0.004 0.1016 0.00797 659.6 2163 0.0228 1750 kHz
39 0.0035 0.0889 0.00632 831.8 2728 0.0175 2250 kHz
40 0.0031 0.07874 0.00501 1049 3440 0.0137 2900 kHz

AWG Notes: American Wire Gauge (AWG) is a standardized wire gauge system used predominantly in the United States to note the diameter of electrically conducting wire.The general rule of thumb is for every 6 gauge decrease the wire diameter doubles and every 3 gauge decrease doubles the cross sectional area.

Diameter Notes: A mil is a unit of length equal to 0.001 inch (a "milli-inch" or a "thousandth of one inch")ie. 1 mil = 0.001".

Resistance Notes: The resistance noted in the table above is for copper wire conductor.For a given current, you can use the noted resistance and apply Ohms Law to calculate the voltage drop across the conductor.

Current (ampacity) Notes: The current ratings shown in the table are for power transmission and have been determined using the rule of1 amp per 700 circular mils, which is a very conservative rating.For reference, the National Electrical Code (NEC) notes the following ampacity for copper wire at 30 Celsius:
14 AWG - maximum of 20 Amps in free air, maximum of 15 Amps as part of a 3 conductor cable;
12 AWG - maximum of 25 Amps in free air, maximum of 20 Amps as part of a 3 conductor cable;
10 AWG - maximum of 40 Amps in free air, maximum of 30 Amps as part of a 3 conductor cable.

Check your local electrical code for the correct current capacity (ampacity) for mains and in wall wiring.

Skin Effect and Skin Depth Notes: Skin effect is the tendency of an alternating electric current (AC) to distribute itself within a conductor so that the current density near the surface of the conductor is greater than that at its core. That is, the electric current tends to flow at the "skin" of the conductor. The skin effect causes the effective resistance of the conductor to increase with the frequency of the current.Themaximum frequency show is for 100% skin depth (ie. no skin effects).

Wire Gauge

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