Basic ConceptsEE CalculatorsElectric Circuit AnalysisElectrical / Electronics App & SoftwareElectrical DesignElectrical EnergyElectrical Formulas & EquationsElectrical Wiring InstallationHow ToRepairingTroubleshooting

Standard Wire Gauge “SWG” Calculator – SWG Size Chart & Table

SWG “Standard Wire Gauge” Size Calculator & Cable Properties Table & Chart

Standard Wire Gauge “SWG” Calculator

The following Standard Wire Gauge (SWG) calculator will calculate the diameter in inches, mm, cross sectional area in inches2, mm2, and kcmil or MCM, resistance per 1000 feet and per 1000 meters and the maximum current capacity in amperes. To calculate the values, just select or enter the SWG size and hit the “Calculate” button to get the result of different properties of SWG cables and wires.

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

Good to know: SWG or Standard Wire Gauge used for wire sizing and properties is also known as “British Standard Wire Gauge” and “British Standard Gauge” or “Imperial Wire Gauge”.

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

Related Calculators:

Wire Diameter in mm & Inch, Area in inch2, mm2 & kcmil and Resistance in Ω/kft & Ω/km Calculations

Wire Diameter in Inches “in”.

dn = 5 x 10-3 x 92(36-n)÷39 = 0.005 x 92(36-n)÷39

Wire Diameter in mm “millimeters”.

dn = 27 x 10-3 x 92(36-n)÷39 = 0.127 x 92(36-n)÷39

Wire Cross Sectional Area in Square Inches “in2“.

An (π ÷ 4) dn2= 19635 x 10-6 x 92(36-n)÷19.5

Wire Cross Sectional Area in Square Millimeter “mm2“.

An = (π ÷ 4) x dn2 = 12.668 x 10-3 x 92(36-n)÷19.5

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

An = 1000 dn2 = 0.025 x 92(36-n)÷19.5

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

R= 0.3048 x 109 × ρ ÷ (25.42An)

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

R= 109 x ρ ÷ An

Where: 

  • n = Number of the gauge size. 
  • d = The wire diameter in inches, mm, inches2, & mm2 respectively.
  • An = Cross sectional area of “n” gauge wire size in inches2, “mm2” & kcmil respectively.
  • R = Resistance of the wire conductors in Ω/kft & Ω/km respectively.
  • ρ = rho = resistivity in (Ω·m).

Related Posts

Standard Wire Gauge “SWG” Size Chart & Table

The following SWG “Standard Wire Gauge” table shows the SWG size and diameter in inches “in” and millimeter “mm”, its cross section area in Inches2, mm2, and kcmil or MCM and resistance in ohms per 1000 feet and 1000 meter. The SWG size chart also shows the maximum capacity of current in amperes.

SWG DiameterCross Section AreaResistance in ΩMax Current “A”
inchmminch2mm2kcmilΩ / kftΩ / kmAmp Capacity
7/00.50012.7000.1963126.67692500.04140.136305.5
6/00.46411.7860.1691109.09212150.04810.158264.8
5/00.43210.9730.146694.56381870.05540.182227.0
4/00.40010.1600.125781.07321600.06470.213196.3
3/00.3729.4490.108770.12021380.07480.246171.8
2/00.3488.8390.095161.36431210.08540.281148.9
00.3248.2300.082453.19211050.09860.324127.7
10.3007.6200.070745.603790.00.11500.378108.1
20.2767.0100.059838.598976.20.13580.44790.1
30.2526.4010.049932.178063.50.16290.53676.4
40.2325.8930.042327.273053.80.19220.63263.8
50.2125.3850.035322.773544.90.23020.75752.3
60.1924.8770.029018.679336.90.28070.92344.2
70.1764.4700.024315.695831.00.33401.1033.3
80.1604.0640.020112.971725.60.40421.3326.5
90.1443.6580.016310.507120.70.49901.6421.2
100.1283.2510.01298.301916.40.63152.0816.6
110.1162.9460.01066.818313.50.76892.5313.6
120.1042.6420.00855.480510.80.95663.1510.9
130.0922.3370.00664.28888.461.22244.028.58
140.0802.0320.00503.24296.401.61665.326.49
160.0721.6260.00412.07555.181.99586.565.25
150.0641.8290.00322.62684.102.52608.314.15
170.0561.4220.00251.58903.143.299210.93.18
180.0481.2190.00181.16752.304.490614.82.33
190.0401.0160.00130.81071.606.466521.31.62
200.0360.9140.00100.65671.307.983326.31.31
210.0320.8130.00080.51891.0210.10433.21.038
220.0280.7110.00060.39730.78413.19743.40.794
230.0240.6100.00050.29190.57617.96259.10.584
240.0220.5590.00040.24520.48421.37770.30.490
250.0200.50800.00030.20270.40025.86685.10.405
260.0180.45720.000250.16420.32431.9331050.328
270.01640.41660.000210.13630.26938.4681270.273
280.01480.37590.000170.11100.21947.2351550.222
290.01360.34540.000140.09370.18555.9381840.187
300.01240.31500.000120.07790.15467.2892210.159
310.01160.29460.000100.06820.13576.8902530.136
320.01080.27430.000090.05910.11788.7032920.118
330.01000.25400.000080.05070.100103.463400.101
340.00920.23370.000070.04290.0846122.244020.086
350.00840.21340.000050.03580.0706146.634820.071
360.00760.19300.000040.02930.0578179.135890.0586
370.00680.17270.000030.02340.0462223.757360.0469
380.00600.15240.0000280.01820.0360287.399450.036
390.00520.13210.0000210.01370.0270382.6312600.027
400.00480.12190.000018090.01170.0230449.0614800.023
410.00440.11180.000015220.00980.0194534.4617600.019
420.0040.10160.000012570.00810.0160646.6421300.016
430.00360.09140.000010170.00660.0130798.3326300.013
440.00320.08130.000008050.00520.01021010.3833200.010
450.00280.07110.000006150.00400.007841319.6843400.008
460.00240.06100.000004530.00290.005761796.2459100.006
470.00200.05080.000003140.00200.004002586.5885100.004
480.00160.04060.000002010.00130.002564041.53133000.003
490.00120.03050.000001130.00070.001447184.95236000.0015
500.00100.02540.000000780.00050.0010010346.3340000.001

Notes:

  • The data for resistance of wires in Ω/km and Ω/kft are at 20°C or 68°F.
  • The current capacity for copper wire are at 200A/cm²

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

Standard Wire Gauge Table - SWG Size Chart

Related Electrical and Electronic Engineering Calculators:

Show More

Electrical Technology

All about Electrical & Electronics Engineering & Technology. Follow , Twitter , Instagram, Pinterest, YouTube, & Linkedin to get the latest updates or subscribe Here to get latest Engineering Articles in your mailbox.

Leave a Reply

Your email address will not be published. Required fields are marked *

Back to top button

Adblock Detected

Our website is made possible by displaying online advertisements to our visitors. Please consider supporting us by disabling your ad blocker. We depends on ad revenue to keep creating quality content for you to learn and enjoy for free.