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Electronics & Wiring

AWG to mm and inches (Wire Gauge Conversion)

Convert American Wire Gauge (AWG) sizes to millimeters and inches. Use the quick table for common gauges, then verify strand diameter and ampacity with manufacturer specs.

10–26 AWGDiameter referenceStranded vs solid

Conversion formulas

AWG nominal diameter (in) = 0.005 × 92^((36 − AWG)/39)

mm = inches × 25.4

Cross-sectional area (mm²) = π × (dmm/2)²

Circular mils (CM) = (dinch × 1000)²; kcmil = CM / 1000

Use mm to inches and fraction converters for custom values; keep ampacity decisions tied to standards.

Quick tools

Convert arbitrary diameters with the main calculator. For fractional notation, use the fraction converter.

Open mm to inchesFraction converter

Interactive AWG calculator

Set gauge to see diameter, cross-sectional area, circular mils (CM/kcmil), and approximate copper DC resistance at 20°C.

Unit:
Diameter (mm)
4.115
in: 0.1620
Area (mm²)
13.302
Circular mils (CM)
26251
kcmil: 26
Copper DC resistance @20°C (Ω/km)
1.30

Based on nominal solid conductor diameter. Stranded diameters vary. Resistance uses copper resistivity ≈ 1.724 µΩ·cm at 20°C.

References: IACS 100% copper resistivity and IEC 60228 conductor classes (informational). For ampacity, consult NEC/IEC tables and manufacturer datasheets.

AWG wire chart (0000–40)

Cable gauge AWG quick reference with diameter, area, circular mils, and approximate copper DC resistance at 20°C. Values are nominal for solid conductors.

AWGDiameter (mm)Diameter (in)Area (mm²)CMkcmilCopper DC R @20°C (Ω/km)
0000 (4/0)11.6840.4600107.2192116002120.16
000 (3/0)10.4050.409685.0291678061680.20
00 (2/0)9.2660.364867.4311330771330.26
08.2510.324953.4751055351060.32
17.3480.289342.40883693840.41
26.5440.257633.63166371660.51
35.8270.229426.67052635530.65
45.1890.204321.15141741420.82
54.6210.181916.77333102331.03
64.1150.162013.30226251261.30
73.6650.144310.54920818211.63
83.2640.12858.36616510172.06
92.9060.11446.63413093132.60
102.5880.10195.26110383103.28
112.3050.09074.172823484.13
122.0530.08083.309653075.21
131.8280.07202.624517856.57
141.6280.06412.081410748.29
151.4500.05711.6503257310.45
161.2910.05081.3092583313.17
171.1500.04531.0382048216.61
181.0240.04030.8231624220.95
190.9120.03590.6531288126.41
200.8120.03200.5181022133.31
210.7230.02850.410810142.00
220.6440.02530.326642152.96
230.5730.02260.258509166.78
240.5110.02010.205404084.21
250.4550.01790.1623200106.19
260.4050.01590.1292540133.90
270.3610.01420.1022020168.85
280.3210.01260.0811600212.92
290.2860.01130.0641270268.48
300.2550.01000.0511010338.55
310.2270.00890.040800426.90
320.2020.00800.032630538.32
330.1800.00710.025500678.80
340.1600.00630.020400855.96
350.1430.00560.0163201079.34
360.1270.00500.0132501361.02
370.1130.00450.0102001716.22
380.1010.00400.0081602164.11
390.0900.00350.0061202728.89
400.0800.00310.0051003441.07

Disclaimer: Values are rounded and based on nominal solid conductor diameter. Stranded wire overall diameters vary by strand count and insulation. Resistance uses copper resistivity ≈ 1.724 µΩ·cm at 20°C (IACS 100%). Use manufacturer datasheets and standards (NEC/IEC) for ampacity.

Reference: American wire gauge, IACS copper. For background, see gauge systems explained.

Frequently Asked Questions

Convert and specify wire sizes

Pair AWG dimensions with exact mm and inch values on drawings, and reference ampacity tables for safe current ratings.

Open mm to inchesView chart
AWG to mm and inches — Wire Gauge Conversion