Voltage Drop Calculator

Calculate voltage drop (V and %) for single/three-phase lines from current, length, and cable section.

Voltage Drop Calculator

Calculate line voltage drop from current, cable length, and cross section.

Results update instantly

Share this calculation

Shared links include attribution tags automatically.

Where is it used?

Useful for feeder and branch circuit planning before field installation.

Helps choose cable size early in the design stage.

What does it output?

Returns total voltage drop in volts and percentage.

Applies conductor resistivity for copper or aluminum.