DC Wire Gauge, Copper Cross-Section (mm²) & Voltage Drop Calculator
Calculate electrical voltage drop percentage, power loss in Watts, and recommended American Wire Gauge (AWG) or metric mm² copper cable size for 12V, 24V, and 48V DC circuits.
Calculator Inputs
Live Real-TimeTotal Circuit Voltage Drop Percentage
Voltage Lost in Wire (Volts Drop)
0.7 V
Delivered Voltage at Appliance Terminals
11.3 V
Detailed Calculation Breakdown
Calculation Methodology
Voltage Drop (V) = (2 * One-Way Run Length (m) * Amperage (A) * 0.0175 Copper Resistivity) / Cross-Section Area (mm²). Voltage Drop % = (Vdrop / Vsource) * 100.
Important Legal & Educational Disclaimer
National Electrical Code (NEC) recommends keeping total circuit voltage drop below 3% for critical solar inverters, marine electronics, and battery banks.
This calculator is designed for educational and informational purposes only based on public statutory frameworks. The outputs do not constitute binding financial, tax, or legal advice. We assume no liability for decisions made based on these estimations. Always verify with the relevant official authorities or a certified professional advisor.
Frequently Asked Questions
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