# Voltage Drop Calculator

> Estimate voltage drop for a copper or aluminum wire run. Inputs: voltage, current, one-way length, circuit type, and gauge or custom resistance. Returns voltage drop, percent drop, and voltage at the load.

**URL:** https://www.calculatoranswers.com/voltage-drop-calculator
**Category:** Education

## Quick Answer

Calculate the voltage drop of an electrical circuit. Enter the voltage, current, wire gauge, length, and phase to check compliance.

## Definition

A voltage drop calculator is an electrical engineering tool that computes the reduction in electrical potential along a circuit's length. The calculator uses Ohm's law and wire resistivity values to determine voltage loss based on wire material (copper or aluminum), wire gauge size, circuit current load, circuit length, and system phase (single or three-phase). It outputs the voltage drop in volts and percentage, indicating compliance with electrical standards. Electricians and engineers use this tool to select appropriate wire sizes and prevent equipment failure.

## How to Use

1. **Enter electrical parameters** — Type the source voltage, circuit current load in amperes, and the system phase.
2. **Select wire properties** — Choose the wire conductor material, size gauge, and the total one-way wire distance.
3. **Read voltage drop** — View the calculated voltage loss in volts and percentage, plus NEC code compliance recommendations.

## Disclaimer

This calculator provides estimates for educational and planning purposes. Always consult a qualified professional for specific advice on financial, medical, legal, or other regulated decisions.

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