Voltage Drop Calculator
Estimate the voltage drop along a cable run.
Result
Results are estimates for general information only and are not professional advice.
Voltage drop
As current flows through a cable, some voltage is lost to the cable's resistance. The drop is 2 × length × resistance × current (the factor of 2 accounts for the return path). This calculator gives the drop in volts and as a percentage of the source.
Frequently Asked Questions
What is the Voltage Drop Calculator?
Estimate the voltage drop along a cable run. It runs instantly in your browser and is completely free.
Is the Voltage Drop Calculator free and does it require signup?
Yes. Every calculator on Calculatis is 100% free with no registration, and the values you enter are never stored.
How accurate is the Voltage Drop Calculator?
It uses standard, widely-accepted formulas. Results are reliable estimates for general use and are not a substitute for professional advice.