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Instant result
Enter the data and press the button to do the calculation.
Online Calculator
Cable voltage drop calculator
Enter the material, one-way length, cross-sectional area, current, and voltage to estimate resistance and voltage drop.
Simple DC estimate at the reference temperature. It does not replace code-compliant electrical installation calculations.
Information
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Local processing
The values are processed directly in your browser.
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Free
No registration, external API or subscription required.
Frequently asked questions
What length should I enter?
The one-way length; the calculator doubles it to account for the return path.
What resistivity does it use?
Approximate reference values for copper and aluminium.
Does temperature affect the result?
Yes. The resistance of conductors changes with temperature.
Does it serve as a policy calculation?
No. It is a basic technical estimate and does not replace applicable standards or engineering calculations for an installation.