Wire Size Calculator
Calculate the correct wire gauge (AWG) for electrical circuits. Factor in amperage, voltage, distance, and voltage drop limits.
29.3Kuses
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Recommended Wire Gauge
AWG 12
Voltage drop: 3.18V (2.6%)
By Ampacity
AWG 12
By Voltage Drop
AWG 12
Actual V Drop
3.18V
Ampacity
20A
Wire Sizing Guide
Wire must handle both the current (ampacity) and keep voltage drop below 3% (NEC recommendation). Longer runs need larger wire. Aluminum needs 1 size larger than copper.
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Disclaimer: This tool is provided as-is for informational and educational purposes only.