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.
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.
Frequently Asked Questions (FAQ)
What does the AWG wire size converter do?
It converts AWG wire gauge to mm, mm2, amps and resistance, giving electricians a quick wire size reference.
Who is this tool for?
Electricians, technicians and DIY users who need to match wire gauge to diameter and current ratings.
Can I find the AWG size from mm² instead?
Yes. Enter the cross-section area in mm² and the tool finds the matching AWG size.
What AWG range does it cover?
AWG sizes from 0000 down to 40.
Does a smaller AWG number mean thicker wire?
Yes. In the AWG system a lower number means a thicker wire that can carry more current.