AWG Wire Size Converter
Electricians and DIYers use this free converter to turn American Wire Gauge sizes into mm, mm², approximate current capacity and resistance — or to find the nearest AWG size from a mm² value — with a full reference chart included.
You can also write 0000, 000, 00, 0 (or 4/0, 3/0, 2/0, 1/0).
The nearest standard AWG size will be shown.
Ampacity and resistance are approximate values for copper wire — for open wiring in air. Always confirm with a certified electrician for the actual load.
AWG Size Chart
Full chart of common wire sizes (diameter, area, approximate amps):
| AWG | Diameter (mm) | Area (mm²) | ~Amps (Cu) | Ω / km |
|---|
How to use
- Type the AWG number (e.g. 12) or enter the mm² value.
- Press Convert — you get the diameter, area, approximate current capacity and resistance.
- Compare all standard sizes in the chart below.
Good to know
- Remember that a bigger AWG number means a thinner wire — 10 AWG is much thicker than 18 AWG.
- The amp ratings shown are approximate for open wiring; always confirm with a certified electrician for the actual load.
- When replacing wire, never use a thinner wire than what was originally fitted.