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Voltage Drop Calculator — Free Online Calculator

Voltage Drop solves Vdrop = (2 × K × I × L) / CM — Vdrop = voltage drop, K = resistivity constant, I = current (A), L = one-way wire length (ft), CM = wire cross-section (circular mils). Enter your known values and the calculator solves for the rest instantly. It runs entirely in your browser, so nothing you enter is uploaded to a server. Free to use, with no signup and no watermark.

How to use Voltage Drop

1. Enter your known values in the fields.
2. The result updates instantly as you type.
3. Copy or note down the result.

Frequently asked questions

What formula does Voltage Drop use?

Vdrop = (2 × K × I × L) / CM — Vdrop = voltage drop, K = resistivity constant, I = current (A), L = one-way wire length (ft), CM = wire cross-section (circular mils).

Can I use it on my phone?

Yes. The layout adapts to small screens and behaves the same on mobile as on desktop.

Is my input saved anywhere?

No. Values stay in your browser and are gone as soon as you close the tab.

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