12 Volt Wiring Size Chart

Easily Find the Right 12V DC Wire Size

Avoid the risks of improper wiring, such as equipment damage or fire hazards. The 12 Volt Wiring Size Chart is your trusted solution for selecting the correct wire size for any 12V DC project—whether on your boat, in your car, or for your RV. With large, easy-to-read shaded charts for both 3% and 10% voltage drop, you can size wires accurately and efficiently every time.

• Includes detailed tables for both regular and engine-room installations
• Durable, waterproof, and grease-proof design stands up to tough environments
• Compact size, perfect for toolboxes, lockers, or workbenches

How to Use • Step-by-Step with Pictures

Includes More Than Just Wire Sizes

• Wiring connector sizes and color codes
• Battery state of charge chart
• Simple formulas for watts, amps, and volts

Made in USA • Built to Last • Environmentally Friendly

Designed in the USA; printed in the USA on American-made recyclable synthetic paper using environmentally-friendly soy-based inks at a facility that is completely wind-powered. Minimal packaging. Tough enough to handle life on a boat, it won’t tear, degrade, or smear, even in humid or greasy conditions.