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Voltage Drop Calculator – Calculates voltage loss across a wire run based...

The Voltage Drop Calculator calculates voltage loss across a wire run based on length, current, and gauge. This Voltage Drop Calculator applies a standard electronics formula to solve for the unknown variable when the others are known. Keep units consistent for accurate results.

The formula behind this calculator: Voltage drop = current x resistance per foot (based on wire gauge) x wire length. As a practical example: A 50-foot run of 12-gauge wire carrying 10 amps drops roughly 1.6 volts. All results are calculated instantly in your browser — no data is stored or transmitted.

Voltage Drop Calculator FAQ

What does the Voltage Drop Calculator calculate?

Calculates voltage loss across a wire run based on length, current, and gauge.

Are results safe for real electrical work?

These calculations are for reference and educational purposes. Always consult a licensed electrician for actual wiring and electrical installation work.

What is the tolerance on resistor values?

Standard resistors come in E12 or E24 series with tolerances of 5% or 1%. The colour code includes a tolerance band (gold = 5%, silver = 10%, none = 20%).

Does this work on mobile?

Yes — fully responsive and optimised for smartphones, tablets, and desktop browsers.