Wire Size AWG Calculator
AWG size for any current, distance, voltage drop
Recommended AWG
—
American Wire Gauge
📚 Learn more — how it works, FAQ & guide Click to expand
Learn more — how it works, FAQ & guide
Click to expand
Free wire size AWG calculator
Size electrical wire for amperage, distance, voltage drop. Meets NEC 3% voltage drop recommendation.
How to use this tool
- 1
Enter current (amps)
Amperage the wire will carry.
- 2
Enter distance
One-way from source to load (ft or m).
- 3
See recommended AWG
Complies with 3% voltage drop + ampacity.
Frequently Asked Questions
Why voltage drop matters
Excessive drop = less power to appliance, overheated wires. NEC recommends max 3% for branch circuits, 5% for feeders total.
Copper vs aluminum
Aluminum needs ~1.5× larger size for same ampacity. Cheaper but larger physical conductors.
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