Free Boat & Marine Calculators

Plan any project or trip with the Boat Suppliers calculator suite. Estimate resin and paint, size your anchor and propeller, work out fuel burn and loan payments, and convert knots, miles, and nautical miles. Every tool is free, runs in your browser, and needs no signup.

Project & Material Calculators

Epoxy & Resin Calculator Estimate how much epoxy, polyester, or vinyl ester resin your fiberglass layup, coating, or fillet needs, then add the right kit to your cart. Open calculator Boat Paint Calculator Find the gallons of bottom or topside paint for your hull by length, hull type, and number of coats, with products you can buy in one click. Open calculator Fairing & Filler Calculator Work out how much fumed silica, microballoons, or fairing filler to thicken your resin to the right consistency, then add the right jar to your cart. Open calculator MEKP Catalyst Calculator Get the right amount of MEKP hardener for your polyester, vinyl ester, or gelcoat, adjusted for shop temperature, in cc and fluid ounces. Open calculator

Boat Specs & Planning

Propeller Pitch Calculator Dial in the right prop pitch to reach your target wide-open-throttle RPM and predict your boat speed. Open calculator Anchor Size Calculator Get the recommended anchor weight and rode length for your boat size, anchor type, and anchoring conditions. Open calculator Fuel Consumption Calculator Work out fuel burn, cruising range, and trip cost from your engine size and cruise speed, in statute or nautical units. Open calculator Boat Loan Calculator See the monthly payment, total interest, and full payoff for any boat loan by amount, rate, and term. Open calculator

Converters

Speed & Distance Converter Convert knots, mph, nautical miles, statute miles, and kilometers instantly, the way charts and boat speeds are actually measured. Open calculator

Frequently asked questions

Are the Boat Suppliers calculators free to use?

Yes. Every calculator on this page is completely free, runs right in your browser, and needs no account or signup.

Which calculator do I need for a fiberglass or epoxy project?

Start with the Epoxy and Resin Calculator for resin volume, then use the Boat Paint Calculator for coating coverage. Both link straight to the Boat Suppliers products you need.

How accurate are the estimates?

The calculators use standard marine formulas and industry coverage rates. Add roughly ten percent for waste and uneven surfaces, and round up to whole containers when you buy material.

Can I buy the products I need right from a calculator?

Yes. The material calculators pull live Boat Suppliers products and let you add the right quantity to your cart in one click.