Tools, built for the boat.
The same calculators and checkers we reach for when we're sizing ground tackle, a house bank, or working out what the Coast Guard actually requires. Free, no sign-up, and built on the same research as our guides.
Boat Safety Gear Requirements Checker
Enter your boat's length and a few details, and see the gear the US Coast Guard generally requires you to carry, plus the gotchas owners trip on.
Open the checker →Sailboat Battery Bank & Solar Calculator
Turn your onboard loads into the house-bank size, solar array, and charge-controller numbers you actually need.
Open the calculator →Anchor Size & Scope Calculator
Size the anchor for your boat, then get the scope and rode to deploy for the conditions you're anchoring in.
Open the calculator →Boat Fender & Dock-Line Size Calculator
One boat length gives you the fender diameter and count, plus the dock-line diameter and the length to cut your bow, stern, and spring lines.
Open the calculator →Marine DC Wire-Gauge Calculator
Enter your load, run length, and voltage for the AWG that satisfies both voltage drop and ampacity, the ABYC way, plus the fuse to match.
Open the calculator →