Online tools for wire gauge calculator and wire size chart 

Please select awg from drop-down list or can also enter gauge value and select wire from drop-down list and enter Resistivity and click the calculate button to obtain result.

Choose gauge #:
Or Input gauge #:
AWG
Choose wire type:
Resistivity:
Ω·m
Diameter (in inches):
in
Diameter (in millimeters):
mm
Cross sectional (area in kilo circular mils):
kcmil
Cross sectional (area in square inches):
in2
Cross sectional (area in square millimeters):
mm2
Resistance per 1000 feet:
Ω/kft
Resistance per 1000 meters:
Ω/km


How To calculate Wire diameter (if gauge wire diameter dm in inches)

dk(in) = 0.005 in × 92(36-k)/39

How To calculate Wire diameter (if gauge wire diameter dm in millimeters)

dk(mm) = 0.005 mm × 92(36-k)/39

How to calculate Wire cross sectional area (in kcmil)

Ak (kcmil) = 1000×dk2 = 0.025 in2 × 92(36-k)/19.5
An=cross sectional area in kilo-circular mils

dn=wire diameter d in inches

How to calculate Wire cross sectional area (in inches) 

Ak (in2) = (π/4)×dk2 = 0.000019635 in2 × 92(36-k)/19.5
An=cross sectional area in inches

dn=wire diameter d in inches

How to calculate Wire cross sectional area (in millimeters)

Ak(mm2) = (π/4)×dk2 = 0.012668 mm2 × 92(36-k)/19.5

An=cross sectional area in millimeters

dn=wire diameter d in  millimeters

How to calculate Wire resistance (per kilofeet)

Rk (Ω/kft) = 0.3048 × 109 × ρ(Ω·m) / (25.42 × Ak (in2))
 R=resistance in ohms per kilofeet (Ω/kft)

 ρ =wire’s resistivity in ohm-meters (Ω·m)
 An=cross sectional area An in square millimeters (mm2)

How to calculate Wire resistance (per  kilometer)

Rk (Ω/km) = 109 × ρ(Ω·m) / Ak (mm2)

R=resistance in ohms per kilometer (Ω/km)
ρ =wire’s resistivity  in ohm-meters (Ω·m)
Ak=cross sectional area An in square millimeters (mm2)

AWG wire Chart

AWG wire diameter dn Turns of wire Area Unit Copper resistance Unit
inch mm per inch per cm kcmil mm2 O/km O/kFT
0000 (4/0) 0.4600 11.684 2.17 0.856 212 107 0.1608 0.04901
000 (3/0) 0.4096 10.404 2.44 0.961 168 85.0 0.2028 0.06180
00 (2/0) 0.3648 9.266 2.74 1.08 133 67.4 0.2557 0.07793
0 (1/0) 0.3249 8.252 3.08 1.21 106 53.5 0.3224 0.09827
1 0.2893 7.348 3.46 1.36 83.7 42.4 0.4066 0.1239
2 0.2576 6.544 3.88 1.53 66.4 33.6 0.5127 0.1563
3 0.2294 5.827 4.36 1.72 52.6 26.7 0.6465 0.1970
4 0.2043 5.189 4.89 1.93 41.7 21.2 0.8152 0.2485
5 0.1819 4.621 5.50 2.16 33.1 16.8 1.028 0.3133
6 0.1620 4.115 6.17 2.43 26.3 13.3 1.296 0.3951
7 0.1443 3.665 6.93 2.73 20.8 10.5 1.634 0.4982
8 0.1285 3.264 7.78 3.06 16.5 8.37 2.061 0.6282
9 0.1144 2.906 8.74 3.44 13.1 6.63 2.599 0.7921
10 0.1019 2.588 9.81 3.86 10.4 5.26 3.277
11 0.0907 2.305 11.0 4.34 8.23 4.17 4.132 1.260
12 0.0808 2.053 12.4 4.87 6.53 3.31 5.211 1.588
13 0.0720 1.828 13.9 5.47 5.18 2.62 6.571 2.003
14 0.0641 1.628 15.6 6.14 4.11 2.08 8.286 2.525
15 0.0571 1.450 17.5 6.90 3.26 1.65 10.45 3.184
16 0.0508 1.291 19.7 7.75 2.58 1.31 13.17
17 0.0453 1.150 22.1 8.70 2.05 1.04 16.61 5.064
18 0.0403 1.024 24.8 9.77 1.62 0.823 20.95 6.385
19 0.0359 0.912 27.9 11.0 1.29 0.653 26.42
20 0.0320 0.812 31.3 12.3 1.02 0.518 33.31 10.15
21 0.0285 0.723 35.1 13.8 0.810 0.410 42.00 12.80
22 0.0253 0.644 39.5 15.5 0.642 0.326 52.96 16.14
23 0.0226 0.573 44.3 17.4 0.509 0.258 66.79 20.36
24 0.0201 0.511 49.7 19.6 0.404 0.205 84.22 25.67
25 0.0179 0.455 55.9 22.0 0.320 0.162 106.2 32.37
26 0.0159 0.405 62.7 24.7 0.254 0.129 133.9 40.81
27 0.0142 0.361 70.4 27.7 0.202 0.102 168.9 51.47
28 0.0126 0.321 79.1 31.1 0.160 0.0810 212.9 64.90
29 0.0113 0.286 88.8 35.0 0.127 0.0642 268.5 81.84
30 0.0100 0.255 99.7 39.3 0.101 0.0509 338.6 103.2
31 0.00893 0.227 112 44.1 0.0797 0.0404 426.9 130.1
32 0.00795 0.202 126 49.5 0.0632 0.0320 538.3 164.1
33 0.00708 0.180 141 55.6 0.0501 0.0254 678.8 206.9
34 0.00630 0.160 159 62.4 0.0398 0.0201 856.0 260.9
35 0.00561 0.143 178 70.1 0.0315 0.0160 1079 329.0
36 0.00500 0.127 200 78.7 0.0250 0.0127 1361 414.8
37 0.00445 0.113 225 88.4 0.0198 0.0100 1716 523.1
38 0.00397 0.101 252 99.3 0.0157 0.00797 2164 659.6
39 0.00353 0.0897 283 111 0.0125 0.00632 2729 831.8
40 0.00314 0.0799 318 125 0.00989 0.00501 3441 1049

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