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Wire Size & Voltage Drop Calculator
Enter the amps, the voltage and how far the wire runs, and see the wire gauge you need, the voltage drop, the fuse or breaker size, and what to buy.
- Wire gauge for your run
- Voltage drop and volts at the load
- Fuse or breaker size
- Coast Guard ampacity check
Example: a 55 lb trolling motor (50 A at 12 V), 10 feet each way, no more than 3% drop
4
AWG wire
2.1%voltage drop
11.74 Vat the motor
60 Abreaker