Voltage Drop Calculator
Calculate voltage drop and percentage drop in electrical circuits. Find the correct wire gauge to minimize energy loss.
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Calculator insights
What this calculator does
Voltage Drop Calculator helps you quickly estimate calculate voltage drop and percentage drop in electrical circuits. find the correct wire gauge to minimize energy loss. with clean output and clear next steps.
How the calculation works
Enter Source Voltage, Load Current, One-Way Wire Length and this calculator uses standard formulas to determine Voltage Drop and Voltage Drop (%). The output is displayed immediately in a user-friendly format.
Example calculation
For example, enter realistic values into the Voltage Drop Calculator to see how the calculator produces Voltage Drop and Voltage Drop (%) that you can use for planning and comparison.
Disclaimer
The calculations provided by this website are for informational purposes only and should not be considered financial, legal, tax, or professional advice.
Frequently Asked Questions
What is the maximum allowable voltage drop?
NEC recommends max 3% voltage drop for branch circuits and 5% total (including feeder). Higher drops reduce equipment performance and efficiency.