Wire Size Calculator

Determine proper wire gauge based on current, length, and voltage drop

Inputs

Maximum current the wire will carry
Distance from source to load (one direction)
NEC recommends 3% for branch circuits, 5% total

Other Tools

AWG Quick Reference (Copper)
AWG Ampacity Ω/1000ft
14 15A 2.525
12 20A 1.588
10 30A 0.999
8 50A 0.628
6 65A 0.395
4 85A 0.249
2 115A 0.156
1/0 150A 0.098