Cable voltage drop calculator

  1. Input
  2. Result

Input

m
A
V
mm²
%
°C
Quick scenarios

Cable voltage drop and wire size calculator

The calculator estimates voltage drop, losses, conductor resistance and a minimum standard section for the selected limit.

Use the result as a planning estimate and verify final cable selection against local electrical codes, installation method and thermal limits.

How to use this tool →

Quick start

Estimate cable voltage drop, loss and a standard conductor size for DC, single-phase or three-phase circuits.

  1. Choose a practical scenario
  2. Adjust the cable and load values
  3. Calculate and compare standard sections
✓ Use the calculator to turn input values into a clear, repeatable result.
✓ Keep units and assumptions visible so the calculation can be checked later.
✓ Copy the result or key numbers for reports, messages or spreadsheets.
✓ Reset to defaults when you want to compare another scenario from a clean state.
✓ Calculators run in the browser and are useful for quick estimates before formal checks.
✓ For finance, health, engineering or legal decisions, verify important results with a specialist or official source.

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