Voltage Drop Calculator

Calculate voltage drop in electrical wires based on wire gauge, length, and current.

System Type

Voltage (V)

Current (A)

One-Way Length

Wire Material

Wire Gauge (AWG)

Results

Voltage Drop (V)

Drop (%)

End Voltage (V)

Wire Resistance

Power Loss

Status: -

Guidelines

NEC Recommendation: Max 3% drop for branch circuits, 5% total

Formula: Vd = (2 x L x I x R) / 1000 for single phase

Three Phase: Vd = (1.732 x L x I x R) / 1000

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? Frequently Asked Questions

How accurate is this

This calculator uses standard formulas and provides accurate results for typical use cases. For professional or critical applications, always verify results with certified professionals or official sources.

Is this calculator free to use?

Yes, this Voltage Drop Calculator is completely free to use with no registration required. You can use it as many times as needed without any limitations.

Can I use this on mobile devices?

Absolutely! This calculator is fully responsive and works perfectly on smartphones, tablets, and desktop computers.

How do I interpret the results?

The results are displayed clearly with appropriate units. Refer to the About This Calculator section for detailed information.