Boat Calculators
Free marine and nautical calculators for boaters, sailors, and marine enthusiasts. Quick, accurate, and easy to use.
Our Calculators
Choose a calculator to get started
2 Stroke Oil Mix Calculator
Calculate the perfect fuel-to-oil ratio for your 2-stroke outboard engine. Supports 25:1 to 100:1 ratios.
Calculate now →Knots to MPH Converter
Convert speed between knots and miles per hour. Includes km/h, m/s, and other units.
Convert now →Boat Loan Calculator
Estimate your monthly boat payment based on price, down payment, interest rate, and loan term.
Calculate now →Nautical Miles Converter
Convert between nautical miles and land miles, kilometers, meters, and more.
Convert now →Boat Fuel Calculator
Calculate trip fuel consumption and cost based on distance, speed, and your boat’s fuel burn rate.
Calculate now →Sea Distance Calculator
Calculate nautical miles between ports with our interactive map. Smart routing through straits and canals.
Calculate now →Boat Travel Time Calculator
Calculate how long your boat trip will take based on distance and vessel speed. Plan your voyage duration.
Calculate now →About Boat Calculators
We created Boat Calculators to help boaters, sailors, and marine enthusiasts with quick and accurate calculations. Whether you need to mix fuel for your outboard, convert nautical measurements, or plan your boat financing — our tools are here to help.
All calculators are free, work on any device, and require no registration.