Wire Sizing Reference

Wire SizeQuick Reference

Pre-calculated wire sizes for the most common residential and commercial electrical scenarios. Each page provides an instant NEC-compliant answer with copper and aluminum options, a full comparison table, and technical considerations specific to your installation.

15 & 20 Amp Branch Circuits

9 scenarios

30 & 40 Amp Circuits

10 scenarios

50 & 60 Amp Circuits

12 scenarios

80 Amp Service

3 scenarios

100 Amp Service

5 scenarios

125 & 150 Amp Service

9 scenarios

200 Amp Service

6 scenarios

EV Charger

6 scenarios

Sub-Panel Feeder

4 scenarios

Well Pump

6 scenarios

Pool Pump

4 scenarios

HVAC / AC Unit

6 scenarios

Hot Tub / Spa

4 scenarios

Barn / Outbuilding

6 scenarios

Need Different Parameters?

Three-phase, custom voltage, or different max drop percentage? Use the interactive calculator.

Interactive Wire Size Calculator