Boating & Sailing
Calculators for boaters and sailors: hull speed, anchor scope, distance to horizon, sail area to displacement, fuel planning and the Beaufort wind scale, with the formulas shown.
Anchor Scope Calculator
Calculate how much anchor rode to let out from water depth, bow height, scope ratio and tide. Get the total height and rode length in feet with the formula.
Beaufort Scale Calculator
Convert wind speed in knots to a Beaufort force number. See the force, its sea-state description and the typical wave height for that wind.
Boat Fuel Calculator
Estimate trip fuel for a powerboat from distance, speed, gallons per hour and a safety reserve. See hours underway and base and total fuel in gallons.
Distance to Horizon Calculator
Calculate how far away the horizon is from your eye height. Get the distance in nautical miles, statute miles and kilometres with the formula shown.
Hull Speed Calculator
Calculate the theoretical hull speed of a displacement boat from its waterline length. Get the result in knots, mph and km/h with the formula shown.
Sail Area to Displacement
Calculate a sailboat's sail area to displacement (SA/D) ratio from sail area and weight. See the ratio, the displacement volume and a performance band.