BoatCalcs.com provides free boating and marine calculators including fuel burn rate, cruising range, navigation tools, boat sizing, ownership costs, and maintenance scheduling. With 30 calculators across 4 categories — from GPH fuel burn and anchor rode calculators to hull speed guides and loan estimators — we cover the tools boat owners actually need, without the clutter.
Our mission is simple: give boaters accurate, fast, and free calculation tools with no barriers. There are no accounts to create, no paywalls to hit, and no personal data to hand over. You open a calculator, enter your boat details, and get your answer. That's it.
Every calculator on BoatCalcs uses standard marine industry formulas, established navigation equations, and real-world equipment specifications. We build each tool with care for both accuracy and speed, so the math runs entirely in your browser with instant results.
Whether you're calculating fuel burn for your next trip, figuring out anchor rode scope, estimating annual ownership costs, or sizing a propeller for your engine, BoatCalcs is here to help. We always recommend consulting a licensed marine professional for critical safety decisions.
Free, fast, and built for every boat owner.