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AWG Wire Size Chart (AWG to mm²)

AWG wire size chart for solid conductors, with diameter, cross sectional area, copper resistance and the nearest standard metric size.

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  • 34 rows of reference data
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AWG sizes

AWGDiameter mmDiameter inchArea mm²Cu Ω/km at 20 °CNearest mm²
4/0 (0000)11.6840.4600107.2190.161120
3/0 (000)10.4050.409685.0290.20395
2/0 (00)9.2660.364867.4310.25670
1/0 (0)8.2510.324953.4750.32250
17.3480.289342.4080.40750
26.5440.257633.6310.51335
35.8270.229426.6700.64625
45.1890.204321.1510.81525
54.6210.181916.7731.02816
64.1150.162013.3021.29616
73.6650.144310.5491.63410
83.2640.12858.3662.06110
92.9060.11446.6342.5996
102.5880.10195.2613.2776
112.3050.09074.1724.1324
122.0530.08083.3095.2114
131.8280.07202.6246.5712
141.6280.06412.0818.2852
151.4500.05711.65010.4481.5
161.2910.05081.30913.1741.5
171.1500.04531.03816.6121.0
181.0240.04030.82320.9480.75
190.9120.03590.65326.4150.75
200.8120.03200.51833.3080.50
210.7230.02850.41042.0010.50
220.6440.02530.32652.9620.50
230.5730.02260.25866.7840.50
240.5110.02010.20584.2130.50
250.4550.01790.162106.1910.50
260.4050.01590.129133.9040.50
270.3610.01420.102168.8500.50
280.3210.01260.081212.9160.50
290.2860.01130.064268.4820.50
300.2550.01000.051338.5500.50
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About this Table

AWG wire size chart for solid conductors, with diameter, cross sectional area, copper resistance and the nearest standard metric size.

Basis: ASTM B258 AWG definition: d = 0.127 × 92^((36 − n) ÷ 39) mm. Resistance uses annealed copper at 20 °C (0.017241 Ω mm²/m, IACS).

How to use

  1. Find the AWG size.
  2. Read the area in mm² and the nearest metric size.
  3. Use Ω/km × loop length to estimate voltage drop.

Notes

  • Every 3 AWG steps roughly halves or doubles the area.
  • Stranded wire has a slightly larger overall diameter than shown.
  • The nearest metric size is for reference only; check current rating before substituting.

Related tools

AWG to mm² CalculatorFree on instrumentationblog.inCable Resistance CalculatorFree on instrumentationblog.inInstrument Cable Loop ResistanceFree on instrumentationblog.in
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Frequently Asked Questions

What is 18 AWG in mm²?

0.823 mm², close to 0.75 mm².

What is 12 AWG in mm²?

3.309 mm², close to 4 mm² (often replaced by 2.5 or 4 mm²).

Does this chart give ampacity?

No. Current rating depends on insulation, installation method and temperature.

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