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Sailing calculators
Plan with practical boating tools.
Quick calculators for passages, anchoring, speed, wind and fuel—available without signing in.
Calculator library
Anchor Scope Calculator
Calculate anchor rode length from depth, bow height and scope.
Use calculatorApparent Wind Calculator
Calculate apparent wind from true wind and boat movement.
Use calculatorHull Speed Calculator
Estimate displacement hull speed from waterline length.
Use calculatorSailing ETA Calculator
Estimate passage duration and arrival from distance and speed.
Use calculatorNautical Distance Calculator
Turn passage distance into time, speed and daily-run figures.
Use calculatorNautical Mile Converter
Convert nautical miles, kilometres, metres and statute miles.
Use calculatorKnots to km/h Converter
Convert vessel speed between knots and kilometres per hour.
Use calculatorInitial Bearing Calculator
Calculate the initial true bearing between two coordinates.
Use calculatorGreat Circle Distance Calculator
Calculate the shortest spherical distance between two positions.
Use calculatorBoat Fuel Consumption Calculator
Estimate passage fuel from engine time or distance and speed.
Use calculatorVMG Calculator
Calculate velocity made good toward a waypoint or mark.
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