Wire gauge converter

AWG ↔ diameter in mm/inch ↔ cross-section in mm², with copper resistance per km and per 1000 ft.

Diameter follows the AWG ratio 0.127 mm × 92^((36−n)/39). Resistance uses annealed copper at 20 °C. Ampacity is not reported — it depends on insulation and code, not just gauge.

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How to use

  1. Pick what you have: AWG, diameter, or cross-section.
  2. Enter the value.
  3. Read the equivalent gauge, dimensions, and resistance.

What it supports

AWG −3 (4/0) through 40; non-AWG inputs snap to the nearest standard gauge. Resistance assumes annealed copper at 20 °C. Ampacity is intentionally not shown — it depends on insulation, bundling, and code, not just gauge. Values display to at most 4 decimal places.

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