Voltage Drop Calculator

Circuit Parameters

Results

Voltage Drop0.00 V
Voltage Drop Percentage0.00%
Power Loss0.00 W
Circuit Efficiency100.00%

Wire Specifications

2 AWG

95A

Diameter: 6.544 mm

Resistance: 0.513 Ω/1000ft

Heavy-duty industrial applications

4 AWG

70A

Diameter: 5.189 mm

Resistance: 0.815 Ω/1000ft

For high-current applications

6 AWG

55A

Diameter: 4.115 mm

Resistance: 1.296 Ω/1000ft

Used for sub-panels and heavy equipment

8 AWG

40A

Diameter: 3.264 mm

Resistance: 2.061 Ω/1000ft

Common in larger appliance circuits

10 AWG

30A

Diameter: 2.588 mm

Resistance: 3.277 Ω/1000ft

Used for water heaters and AC units

12 AWG

20A

Diameter: 2.053 mm

Resistance: 5.211 Ω/1000ft

Standard for household power outlets

14 AWG

15A

Diameter: 1.628 mm

Resistance: 8.286 Ω/1000ft

Common in residential lighting circuits

1/0 AWG

125A

Diameter: 8.251 mm

Resistance: 0.323 Ω/1000ft

Used in service entrances

Guidelines

Voltage Drop Limits

  • Maximum 3% for branch circuits
  • Maximum 5% for combined feeder and branch
  • Lower voltage drop means better efficiency

Material Properties

  • Copper: Better conductivity, higher cost
  • Aluminum: Lighter weight, lower cost
  • Temperature affects resistance