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American Wire Gauge “AWG” Calculator – AWG Size Chart & Table

Electrical Technology
1 6 minutes read

AWG “American Wire Gauge” Size Calculator & Cable Properties Table & Chart

American Wire Gauge “AWG” Calculator

The following American Wire Gauge (AWG) calculator will calculate the diameter in mm, inches, cross sectional area in mm2, inches2 and kcmil or MCM, resistance per 1000 feet and per 1000 meters and the current rating in amperes for chassis wiring and power transmission applications. To calculate the values, just select or enter the AWG size and hit the “Calculate” button to get the result of different properties of AWG cables and wires.

Select Gauge #:
Or Enter Gauge #: AWG
Select Wire Type:
Resistivity “ρ” : Ω.m
  
Diameter in Millimeters: mm
Diameter in Inches: in
Cross Sectional Area in Square Millimeters: mm2
Cross Sectional Area in Square Inches: in2
Cross Sectional Area in kilo Circular Mils: kcmil
Resistance per 1000 Feet*: Ω/kft
Resistance per 1000 Meters*: Ω/km

Good to know: AWG or American Wire Gauge is also known as “Brown and Sharpe Wire Gauge” used in North America for wire sizing.

*The data for resistance of copper and other wires in Ω/km and Ω/kft are at 20°C or 68°F.

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AWG - American Wire Gauge Calculator

Wire Diameter in mm & Inch Calculation

Wire Diameter in mm “millimeters”.

dn = 27 x 10-3 x 92(36-n)÷39

dn = 0.27 x 92(36-n)÷39     …     In millimeters (mm).

Where:

  • d = The wire diameter in millimeter “mm”.
  • n = Number of the gauge size. 

Wire Diameter in Inches “in”.

dn = 5 x 10-3 x 92(36-n)÷39

dn = 0.005 x 92(36-n)÷39     …     In inches

Where:

  • d = The wire diameter in inches “in”.
  • n = Number of the gauge size. 

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Wire Cross Sectional Area in mm2, inch2 & kcmil Calculations

Wire Cross Sectional Area in Square Millimeter “mm2“.

An = (π ÷ 4) x dn2

An = 12.668 x 10-3 x 92(36-n)÷19.5

Where:

  • An = Cross sectional area of “n” gauge wire size in square millimeters “mm2“.
  • n = The number “#” of gauge size.
  • d = Wire square diameter in “mm2“.

Wire Cross Sectional Area in Square Inches “in2“.

An = (π ÷ 4) x dn2

An = 19635 x 10-6 x 92(36-n)÷19.5

Where:

  • An = Cross sectional area of “n” gauge wire size in square inches “in2“.
  • n = The number “#” of gauge size.
  • d = Wire square diameter in “in2“.

Wire Cross Sectional Area in kcmil “kilo circular mils”.

An = 1000 x dn2 = 0.025 x 92(36-n)÷19.5

Where:

  • An = cross sectional area of “n” gauge wire size in kcmil.
  • kcmil = kilo circular mils.
  • n = the number of gauge size.
  • d = wire square diameter in in2.

Note: kcmil is also known as MCM “thousands of circular mils” i.e. 1kcmil = 1MCM = 0.5067 mm2.

2 MCM ≈ 1 mm2

1000 mils = 1 inch

In addition, MCM and kcmil is used for large diameter wires in AWG.

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Wire Resistance Calculations Formula

Resistance per 1000 feet at 20°C or 68°F:

Rn = 0.3048 x 109 × ρ ÷ (25.42x An)

Where;

  • R = Resistance of the wire conductors in “Ω/kft”.
  • n = # of gauge size.
  • ρ = rho = resistivity in (Ω·m).
  • An = the cross sectional area of n #gauge in square inches “in2“.

Resistance per 1000 Meters at 20°C or 68°F:

Rn = 109 x ρ ÷ An

Where;

  • R = Resistance of the wire conductors “in Ω/km”.
  • n = # of gauge size.
  • ρ = rho = resistivity in (Ω·m).
  • An = the cross sectional area of n #gauge in square millimeters “mm2“.

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American Wire Gauge “AWG” Size Chart & Table

The following AWG “American Wire Gauge” table shows the AWG Size and diameter in millimeter “mm” and inches in “in”, its cross section area in mm2, Inche2 and kcmil or MCM and resistance in ohms per 1000 feet and 1000 meter. The AWG size chart also shows the current in amperes for chassis wiring and power transfer application.

AWG # Diameter Cross Section Area Resistance in Ω Current in Amps
mm inch mm2 Inch2 kcmil Ω / kft Ω / km Chassis Wiring Power Transfer
0000 (4/0) 11.6840 0.4600 107.2193 0.1662 211.6000 0.049 0.1608 380 302
000 (3/0) 10.4049 0.4096 85.0288 0.1318 167.8064 0.0618 0.2028 328 239
00 (2/0) 9.2658 0.3648 67.4309 0.1045 133.0765 0.0779 0.2557 283 190
0 (1/0) 8.2515 0.3249 53.4751 0.0829 105.5345 0.0983 0.3224 245 150
1 7.3481 0.2893 42.4077 0.0657 83.6927 0.1239 0.4066 211 119
2 6.5437 0.2576 33.6308 0.0521 66.3713 0.1563 0.5127 181 94
3 5.8273 0.2294 26.6705 0.0413 52.6348 0.197 0.6464 158 75
4 5.1894 0.2043 21.1506 0.0328 41.7413 0.2485 0.8152 135 60
5 4.6213 0.1819 16.7732 0.0260 33.1024 0.3133 1.028 118 47
6 4.1154 0.1620 13.3018 0.0206 26.2514 0.3951 1.296 101 37
7 3.6649 0.1443 10.5488 0.0164 20.8183 0.4982 1.634 89 30
8 3.2636 0.1285 8.3656 0.0130 16.5097 0.6282 2.061 73 24
9 2.9064 0.1144 6.6342 0.0103 13.0927 0.7921 2.599 64 19
10 2.5882 0.1019 5.2612 0.0082 10.3830 0.9988 3.277 55 15
11 2.3048 0.0907 4.1723 0.0065 8.2341 1.26 4.132 47 12
12 2.0525 0.0808 3.3088 0.0051 6.5299 1.588 5.211 41 9.3
13 1.8278 0.0720 2.6240 0.0041 5.1785 2.003 6.571 35 7.4
14 1.6277 0.0641 2.0809 0.0032 4.1067 2.525 8.285 32 5.9
15 1.4495 0.0571 1.6502 0.0026 3.2568 3.184 10.448 28 4.7
16 1.2908 0.0508 1.3087 0.0020 2.5827 4.015 13.174 22 3.7
17 1.1495 0.0453 1.0378 0.0016 2.0482 5.063 16.612 19 2.9
18 1.0237 0.0403 0.8230 0.0013 1.6243 6.385 20.948 16 2.3
19 0.9116 0.0359 0.6527 0.0010 1.2881 8.051 26.415 14 1.8
20 0.8118 0.0320 0.5176 0.0008 1.0215 10.152 33.308 11 1.5
21 0.7229 0.0285 0.4105 0.0006 0.8101 12.802 42.001 9 1.2
22 0.6438 0.0253 0.3255 0.0005 0.6424 16.143 52.962 7 0.92
23 0.5733 0.0226 0.2582 0.0004 0.5095 20.356 66.784 4.7 0.729
24 0.5106 0.0201 0.2047 0.0003 0.4040 25.668 84.213 3.5 0.577
25 0.4547 0.0179 0.1624 0.0003 0.3204 32.367 106.19 2.7 0.457
26 0.4049 0.0159 0.1288 0.00025 0.2541 40.814 133.9 2.2 0.361
27 0.3606 0.0142 0.1021 0.00020 0.2015 51.466 168.85 1.7 0.288
28 0.3211 0.0126 0.0810 0.00013 0.1598 64.897 212.92 1.4 0.226
29 0.2859 0.0113 0.0642 0.00010 0.1267 81.833 268.48 1.2 0.182
30 0.2546 0.0100 0.0509 0.00008 0.1005 103.19 338.55 0.86 0.142
31 0.2268 0.0089 0.0404 0.00006 0.0797 130.12 426.9 0.7 0.113
32 0.2019 0.0080 0.0320 0.00005 0.0632 164.08 538.32 0.53 0.091
33 0.1798 0.0071 0.0254 0.00004 0.0501 206.9 678.8 0.51 0.088
34 0.1601 0.0063 0.0201 0.000031 0.0398 260.9 855.96 0.43 0.072
35 0.1426 0.0056 0.0160 0.000025 0.0315 328.98 1,079.3 0.43 0.072
36 0.1270 0.0050 0.0127 0.000020 0.0250 414.84 1,361 0.33 0.056
37 0.1131 0.0045 0.0100 0.000016 0.0198 523.1 1,716.2 0.33 0.056
38 0.1007 0.0040 0.0080 0.000012 0.0157 659.62 2,164.1 0.27 0.044
39 0.0897 0.0035 0.0063 0.000010 0.0125 831.77 2,728.9 0.26 0.043
40 0.0799 0.0031 0.0050 0.000008 0.0099 1,048.8 3,441.1 0.21 0.035

Note: Resistance of wires in Ω/km and Ω/kft are at 20°C or 68°F.

Here is the AWG wire size chart in image format if you need to download it for later use.

American Wire Gauge - AWG Size Chart

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1 6 minutes read

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