VOLTAGEDROPCALCULATOR
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
15A — 50 ft
What Size Wire for 15 Amp 50 Feet Away
15A — 75 ft
What Size Wire for 15 Amp 75 Feet Away
15A — 100 ft
What Size Wire for 15 Amp 100 Feet Away
15A — 150 ft
What Size Wire for 15 Amp 150 Feet Away
20A — 50 ft
What Size Wire for 20 Amp 50 Feet Away
20A — 75 ft
What Size Wire for 20 Amp 75 Feet Away
20A — 100 ft
What Size Wire for 20 Amp 100 Feet Away
20A — 150 ft
What Size Wire for 20 Amp 150 Feet Away
20A — 200 ft
What Size Wire for 20 Amp 200 Feet Away

30 & 40 Amp Circuits

10 scenarios
30A — 100 ft
What Size Wire for 30 Amp 100 Feet Away
30A — 150 ft
What Size Wire for 30 Amp 150 Feet Away
30A — 50 ft
What Size Wire for 30 Amp 50 Feet Away
30A — 75 ft
What Size Wire for 30 Amp 75 Feet Away
30A — 200 ft
What Size Wire for 30 Amp 200 Feet Away
40A — 50 ft
What Size Wire for 40 Amp 50 Feet Away
40A — 75 ft
What Size Wire for 40 Amp 75 Feet Away
40A — 100 ft
What Size Wire for 40 Amp 100 Feet Away
40A — 150 ft
What Size Wire for 40 Amp 150 Feet Away
40A — 200 ft
What Size Wire for 40 Amp 200 Feet Away

50 & 60 Amp Circuits

12 scenarios
50A — 50 ft
What Size Wire for 50 Amp 240V 50 Feet
50A — 75 ft
What Size Wire for 50 Amp 240V 75 Feet
50A — 100 ft
What Size Wire for 50 Amp 240V 100 Feet
50A — 150 ft
What Size Wire for 50 Amp 240V 150 Feet
50A — 200 ft
What Size Wire for 50 Amp 240V 200 Feet
60A — 150 ft
What Size Wire for 60 Amp 150 Feet Away
60A — 200 ft
What Size Wire for 60 Amp 200 Feet Away
60A — 50 ft
What Size Wire for 60 Amp 50 Feet Away
60A — 75 ft
What Size Wire for 60 Amp 75 Feet Away
60A — 100 ft
What Size Wire for 60 Amp 100 Feet Away
60A — 250 ft
What Size Wire for 60 Amp 250 Feet Away
60A — 300 ft
What Size Wire for 60 Amp 300 Feet Away

80 Amp Service

3 scenarios
80A — 100 ft
What Size Wire for 80 Amp 100 Feet Away
80A — 150 ft
What Size Wire for 80 Amp 150 Feet Away
80A — 200 ft
What Size Wire for 80 Amp 200 Feet Away

100 Amp Service

5 scenarios
100A — 100 ft
What Size Wire for 100 Amp 100 Feet Away
100A — 150 ft
What Size Wire for 100 Amp 150 Feet Away
100A — 200 ft
What Size Wire for 100 Amp 200 Feet Away
100A — 250 ft
What Size Wire for 100 Amp 250 Feet Away
100A — 300 ft
What Size Wire for 100 Amp 300 Feet Away

125 & 150 Amp Service

9 scenarios
125A — 100 ft
What Size Wire for 125 Amp 100 Feet Away
125A — 150 ft
What Size Wire for 125 Amp 150 Feet Away
125A — 200 ft
What Size Wire for 125 Amp 200 Feet Away
125A — 250 ft
What Size Wire for 125 Amp 250 Feet Away
150A — 100 ft
What Size Wire for 150 Amp 100 Feet Away
150A — 150 ft
What Size Wire for 150 Amp 150 Feet Away
150A — 200 ft
What Size Wire for 150 Amp 200 Feet Away
150A — 250 ft
What Size Wire for 150 Amp 250 Feet Away
150A — 300 ft
What Size Wire for 150 Amp 300 Feet Away

200 Amp Service

6 scenarios
200A — 100 ft
What Size Wire for 200 Amp 100 Feet Away
200A — 150 ft
What Size Wire for 200 Amp 150 Feet Away
200A — 200 ft
What Size Wire for 200 Amp 200 Feet Away
200A — 250 ft
What Size Wire for 200 Amp 250 Feet Away
200A — 300 ft
What Size Wire for 200 Amp 300 Feet Away
200A — 400 ft
What Size Wire for 200 Amp 400 Feet Away

EV Charger

6 scenarios
40A — 50 ft
Wire Size for 40 Amp EV Charger 50 Feet
50A — 75 ft
Wire Size for 50 Amp EV Charger 75 Feet
50A — 100 ft
Wire Size for 50 Amp EV Charger 100 Feet
60A — 75 ft
Wire Size for 60 Amp EV Charger 75 Feet
60A — 100 ft
Wire Size for 60 Amp EV Charger 100 Feet
80A — 100 ft
Wire Size for 80 Amp EV Charger 100 Feet

Sub-Panel Feeder

4 scenarios
60A — 100 ft
Wire Size for 60 Amp Sub-Panel 100 Feet
100A — 150 ft
Wire Size for 100 Amp Sub-Panel 150 Feet
100A — 200 ft
Wire Size for 100 Amp Sub-Panel 200 Feet
200A — 200 ft
Wire Size for 200 Amp Sub-Panel 200 Feet

Well Pump

6 scenarios
15A — 100 ft
Wire Size for Well Pump — 15 Amp 100 Feet
15A — 200 ft
Wire Size for Well Pump — 15 Amp 200 Feet
20A — 200 ft
Wire Size for Well Pump — 20 Amp 200 Feet
20A — 300 ft
Wire Size for Well Pump — 20 Amp 300 Feet
30A — 300 ft
Wire Size for Well Pump — 30 Amp 300 Feet
30A — 500 ft
Wire Size for Well Pump — 30 Amp 500 Feet

Pool Pump

4 scenarios
15A — 75 ft
Wire Size for Pool Pump — 15 Amp 75 Feet
20A — 100 ft
Wire Size for Pool Pump — 20 Amp 100 Feet
20A — 150 ft
Wire Size for Pool Pump — 20 Amp 150 Feet
30A — 200 ft
Wire Size for Pool Pump — 30 Amp 200 Feet

HVAC / AC Unit

6 scenarios
20A — 50 ft
Wire Size for HVAC Unit — 20 Amp 50 Feet
30A — 75 ft
Wire Size for HVAC Unit — 30 Amp 75 Feet
30A — 100 ft
Wire Size for HVAC Unit — 30 Amp 100 Feet
40A — 100 ft
Wire Size for HVAC Unit — 40 Amp 100 Feet
40A — 150 ft
Wire Size for HVAC Unit — 40 Amp 150 Feet
50A — 150 ft
Wire Size for HVAC Unit — 50 Amp 150 Feet

Hot Tub / Spa

4 scenarios
40A — 50 ft
Wire Size for Hot Tub — 40 Amp 50 Feet
40A — 75 ft
Wire Size for Hot Tub — 40 Amp 75 Feet
50A — 75 ft
Wire Size for Hot Tub — 50 Amp 75 Feet
50A — 100 ft
Wire Size for Hot Tub — 50 Amp 100 Feet

Barn / Outbuilding

6 scenarios
60A — 150 ft
Wire Size for Barn — 60 Amp 150 Feet
60A — 200 ft
Wire Size for Barn — 60 Amp 200 Feet
100A — 200 ft
Wire Size for Barn — 100 Amp 200 Feet
100A — 300 ft
Wire Size for Barn — 100 Amp 300 Feet
200A — 300 ft
Wire Size for Barn — 200 Amp 300 Feet
200A — 400 ft
Wire Size for Barn — 200 Amp 400 Feet

Need Different Parameters?

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

Interactive Wire Size Calculator