Free Voltage Drop Calculator
Voltage drop across a wire run given gauge and length.
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Inputs
Result
Voltage drop
3.14 V
2.62% of supply
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Short answer
Voltage drop across a wire run given gauge and length.
What is the Voltage Drop Calculator?
Voltage drop across a wire run given gauge and length.
How does the Voltage Drop Calculator work?
Enter the inputs above and read the result.
Formula
Variables
RWire resistance for the round-trip length
Explanation
Electrical codes commonly recommend keeping voltage drop under 3% for branch circuits.
Examples
Applications
Advantages
Limitations
Common mistakes
Tips
Related concepts
The Voltage Drop Calculator sits inside the Everyday & Utility Calculators hub, in the science & electrical cluster. Physics, chemistry and electrical engineering formulas. Understanding the terms below makes the output easier to interpret and easier to compare against neighbouring measures.
Practical use cases and industry applications
Understanding Voltage Drop
Voltage drop across a wire run given gauge and length. Within everyday & utility calculators, voltage drop belongs to the science & electrical cluster, where it shares terminology and assumptions with closely related tools.
Learning how voltage drop is calculated
Electrical codes commonly recommend keeping voltage drop under 3% for branch circuits. Working through the variables one at a time — R — makes the result reproducible by hand and easier to sanity-check.
Using voltage drop to make a decision
Because outputs depend on the assumptions you enter, run more than one scenario before committing to a figure.
How voltage drop compares with related measures
voltage, current, resistance, ampacity all describe adjacent aspects of science & electrical. Comparing this calculator's output against those measures — using the related tools listed on this page — prevents a single metric from being read in isolation.
Frequently asked questions
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