The Voltage Drop Calculator estimates the voltage loss that occurs when current flows through an electrical conductor. It uses input values such as supply voltage, current, conductor length, material (copper or aluminum), and wire size (mm² or AWG) to compute the voltage drop, percentage loss, and overall efficiency. The tool automatically adjusts resistivity based on temperature and supports both single-phase and three-phase circuits. It helps electricians, engineers, and students ensure that voltage drops remain within safe limits (typically 3–5%), improving circuit performance and energy efficiency.