Voltage Drop Calculator
Estimate copper-wire voltage drop from wire gauge, current, one-way length, and system voltage.
About this tool
What is Voltage Drop Calculator?
Use this browser-based electrical calculator for quick estimates and unit relationships. Estimate copper-wire voltage drop from wire gauge, current, one-way length, and system voltage. Enter your own values, run the calculation, and review the result without creating an account.
How to use
Get your result in a few steps
- 1
Enter the requested values into the calculator.
- 2
Review any units or options and adjust them for your project.
- 3
Run the calculation and review the result.
- 4
Use the estimate for planning and verify project-specific requirements when appropriate.
Frequently asked questions
Questions about Voltage Drop Calculator
Is this suitable for electrical design or code compliance?
Use the result as an estimate only. Electrical work must follow applicable codes, equipment ratings, and qualified-professional guidance.
Does this calculator support decimal values?
Yes. Decimal values can be used for voltage, current, power, resistance, capacitance, time, and related inputs.
Does the calculation run locally?
Yes. The calculation is designed to run in your browser.
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