Wire Gauge (AWG) Chart
Look up any American Wire Gauge from 4/0 to AWG 40 — diameter in mm and inches, cross-sectional area, copper resistance and safe ampacity — with a handy mm² to nearest-AWG converter.
| AWG | Diameter (mm) | Diameter (in) | Area (mm²) | Resistance (Ω/km) | Resistance (Ω/1000 ft) | Ampacity — chassis (A) | Ampacity — power (A) |
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About Wire Gauge (AWG) Chart
This American Wire Gauge chart covers 43 gauges from 4/0 (0000, the thickest) down to AWG 40, listing each wire’s diameter in millimeters and inches, cross-sectional area in mm², copper resistance in ohms per kilometer and per 1000 feet, and typical ampacity for both chassis wiring and power transmission.
The diameters follow the standard AWG formula and the resistance figures assume copper at 20 °C, so the numbers line up with what electricians, electronics hobbyists and PCB designers expect when sizing conductors. Every column header is click-sortable, and a search box filters the table by gauge.
A built-in converter answers the most common question directly: enter a cross-section in mm² and the tool names the nearest AWG, highlighting and scrolling to the matching row. Clicking a row copies a formatted summary line for quick pasting into notes or a bill of materials.
How to use Wire Gauge (AWG) Chart
- Type a metric cross-section in mm² into the lookup box to get the nearest AWG — the matching row is highlighted and scrolled into view.
- Or search for a specific gauge (for example 12 or 4/0) to filter the table.
- Click any column header — diameter, area, resistance or ampacity — to sort the chart ascending or descending.
- Read the row for diameter in mm and inches, area, copper resistance and the chassis and power-transmission ampacity ratings.
- Click a row or its copy button to copy the gauge’s figures to your clipboard.