Wire Size Calculator
Find the right AWG wire gauge based on amperage, distance, and voltage drop requirements.
About Wire Sizing
Proper wire sizing is critical for electrical safety and efficiency. Wire that is too small can overheat and cause fires; wire that is oversized wastes money. The NEC (National Electrical Code) recommends a maximum voltage drop of 3% for branch circuits and 5% for feeders. Key factors include: current (amps), distance, voltage, wire material (copper vs aluminum), and ambient temperature. Copper has better conductivity but costs more. Aluminum requires larger gauges and special connectors. Always follow local building codes and consult a licensed electrician for installations.