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

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 = 0.127 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 10-392(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) 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:

R= 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:

R= 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 #DiameterCross Section AreaResistance in ΩCurrent in Amps
mminchmm2Inch2kcmilΩ / kftΩ / kmChassis WiringPower Transfer
0000 (4/0)11.68400.4600107.21930.1662211.60000.0490.1608380302
000 (3/0)10.40490.409685.02880.1318167.80640.06180.2028328239
00 (2/0)9.26580.364867.43090.1045133.07650.07790.2557283190
0 (1/0)8.25150.324953.47510.0829105.53450.09830.3224245150
17.34810.289342.40770.065783.69270.12390.4066211119
26.54370.257633.63080.052166.37130.15630.512718194
35.82730.229426.67050.041352.63480.1970.646415875
45.18940.204321.15060.032841.74130.24850.815213560
54.62130.181916.77320.026033.10240.31331.02811847
64.11540.162013.30180.020626.25140.39511.29610137
73.66490.144310.54880.016420.81830.49821.6348930
83.26360.12858.36560.013016.50970.62822.0617324
92.90640.11446.63420.010313.09270.79212.5996419
102.58820.10195.26120.008210.38300.99883.2775515
112.30480.09074.17230.00658.23411.264.1324712
122.05250.08083.30880.00516.52991.5885.211419.3
131.82780.07202.62400.00415.17852.0036.571357.4
141.62770.06412.08090.00324.10672.5258.285325.9
151.44950.05711.65020.00263.25683.18410.448284.7
161.29080.05081.30870.00202.58274.01513.174223.7
171.14950.04531.03780.00162.04825.06316.612192.9
181.02370.04030.82300.00131.62436.38520.948162.3
190.91160.03590.65270.00101.28818.05126.415141.8
200.81180.03200.51760.00081.021510.15233.308111.5
210.72290.02850.41050.00060.810112.80242.00191.2
220.64380.02530.32550.00050.642416.14352.96270.92
230.57330.02260.25820.00040.509520.35666.7844.70.729
240.51060.02010.20470.00030.404025.66884.2133.50.577
250.45470.01790.16240.00030.320432.367106.192.70.457
260.40490.01590.12880.000250.254140.814133.92.20.361
270.36060.01420.10210.000200.201551.466168.851.70.288
280.32110.01260.08100.000130.159864.897212.921.40.226
290.28590.01130.06420.000100.126781.833268.481.20.182
300.25460.01000.05090.000080.1005103.19338.550.860.142
310.22680.00890.04040.000060.0797130.12426.90.70.113
320.20190.00800.03200.000050.0632164.08538.320.530.091
330.17980.00710.02540.000040.0501206.9678.80.510.088
340.16010.00630.02010.0000310.0398260.9855.960.430.072
350.14260.00560.01600.0000250.0315328.981,079.30.430.072
360.12700.00500.01270.0000200.0250414.841,3610.330.056
370.11310.00450.01000.0000160.0198523.11,716.20.330.056
380.10070.00400.00800.0000120.0157659.622,164.10.270.044
390.08970.00350.00630.0000100.0125831.772,728.90.260.043
400.07990.00310.00500.0000080.00991,048.83,441.10.210.035

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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One Comment

  1. Leo Taxil says:

    When will Americans enter the world and use the International System?

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