Sailing calculators
Plan with practical boating tools.
Quick calculators for passages, anchoring, speed, wind and fuel—available without signing in.
Calculator library
Anchoring
Anchor Scope Calculator
Calculate anchor rode length from depth, bow height and scope.
Use calculatorWeather & Wind
Apparent Wind Calculator
Calculate apparent wind from true wind and boat movement.
Use calculatorSailing Performance
Hull Speed Calculator
Estimate displacement hull speed from waterline length.
Use calculatorPassage Planning
Sailing ETA Calculator
Estimate passage duration and arrival from distance and speed.
Use calculatorPassage Planning
Nautical Distance Calculator
Turn passage distance into time, speed and daily-run figures.
Use calculatorConversions
Nautical Mile Converter
Convert nautical miles, kilometres, metres and statute miles.
Use calculatorConversions
Knots to km/h Converter
Convert vessel speed between knots and kilometres per hour.
Use calculatorNavigation
Initial Bearing Calculator
Calculate the initial true bearing between two coordinates.
Use calculatorNavigation
Great Circle Distance Calculator
Calculate the shortest spherical distance between two positions.
Use calculatorFuel
Boat Fuel Consumption Calculator
Estimate passage fuel from engine time or distance and speed.
Use calculatorSailing Performance
VMG Calculator
Calculate velocity made good toward a waypoint or mark.
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