DC Cable Size Calculator

Enter your load and cable length to find the right cable thickness for your 12V, 24V or 48V system.

This calculator is a guide only. Results assume copper cable and continuous load, and are based on voltage drop and an approximate current rating for a single cable in open air. Cables in bundles, conduit or hot engine bays may need to go a size up. Always fit a correctly rated fuse or circuit breaker close to the battery, and have high-current installations checked by a qualified auto electrician.