12V Wire Size Calculator
Free calculate the correct wire gauge for 12v dc circuits based on current draw, wire length, and acceptable voltage drop.
Circuit Parameters
Recommended: 0.3-0.5V for most applications
Results
Enter circuit parameters to calculate wire size
12V DC Wiring Guide
Common Current Draws
- • LED lights: 0.5-2 amps
- • Car stereo: 5-15 amps
- • Winch: 50-200 amps
- • Starter motor: 100-300 amps
Voltage Drop Guidelines
- • Automotive: ≤ 0.5V
- • Marine: ≤ 0.3V
- • Solar/Off-grid: ≤ 3%
- • Always use round-trip distance