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Voltage Drop Calculator

Voltage drop across wire length.

Voltage drop (copper)

Voltage drop
4.76 V
3.97% · NEC recommends ≤3% on branch circuits
Voltage at load
115.24 V
Compliance
Acceptable (≤5%)
Use a thicker AWG to reduce drop
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Voltage Drop Calculator · Generated 5/2/2026 · calccenter.online/calculators/other/voltage-drop

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About the Voltage Drop Calculator

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Voltage drop across wire length. Use this free voltage drop calculator to get instant results. All calculations run in your browser — nothing is sent to a server.

Frequently asked questions

What does this Voltage Drop Calculator do?

Voltage drop across wire length.

Is it free?

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