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Wire Gauge Calculator (AWG to mm²).
Convert AWG wire gauges to diameter and cross-section in mm², find the nearest gauge for a metric size, and get the resistance per length.
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How to use Wire Gauge Calculator (AWG to mm²)
Start from an AWG gauge, a cross-section or a diameter, choose copper or aluminium and an optional length. The full AWG table highlights the match.
How it works
AWG diameter = 0.127 mm × 92^((36 − n) ÷ 39). Resistance = resistivity ÷ area with 1.724 × 10⁻⁸ Ω·m for copper and 2.82 × 10⁻⁸ Ω·m for aluminium.
Example
12 AWG is 2.0525 mm across with 3.3088 mm², about 5.21 Ω per km in copper; 2.5 mm² is closest to 13 AWG.
Questions about Wire Gauge Calculator (AWG to mm²)
Is Wire Gauge Calculator (AWG to mm²) free, and do I need an account?
Yes. This tool is free to use in your browser without an account. Processing takes place on your device.
What are the limits and what should I check?
Solid round conductors at 20 °C. Current capacity depends on insulation and wiring rules, so it is not given. Everything is calculated in your browser; nothing you type is uploaded. Review the result before using it in your work.
Is my input sent to a server?
Your input is processed in your browser and is not uploaded by this tool. Files and pasted text are cleared when the page is refreshed. Normal website requests are still required to load the page and its libraries. Read the privacy explanation.