Electrical & Power
Wire Size Estimator
Estimate a copper wire gauge from current, distance and allowable voltage drop.
Results
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Estimated gauge—
How this calculator works
The estimator checks common copper wire sizes against the selected voltage-drop limit. Ampacity and code requirements may require a larger conductor.
Safety note: Electrical calculations are estimates. Follow local codes and manufacturer instructions, and use a qualified electrician for installation or safety-critical work.