Wire Size Calculator

Pick AWG for ampacity and max voltage drop.

Current (A)

Voltage (V)

One-way length (ft)

Max drop % (%)

Estimates only. Verify with local codes, manufacturer specs, and a qualified installer.

Related calculators

Continue sizing with a related tool.

DC voltage drop for solar wiring by AWG and length.

Convert watts to amps for AC or DC circuits with optional power factor.

Convert amps to watts at your system voltage.