Sailing Performance Calculators
Sailing performance calculators for hull speed, velocity made good, sailing time, apparent wind, and related performance relationships. Use these tools to evaluate common sailing-performance measurements and planning calculations.
Anchor Scope Calculator
Find how much anchor rode to pay out for a given water depth and scope ratio. Supports feet and meters.
Use calculator →Boat Fuel Consumption Calculator
Estimate fuel needed for a passage from consumption rate and travel time or distance and speed.
Use calculator →Hull Speed Calculator
Estimate theoretical hull speed from waterline length using the classic 1.34 × √LWL rule for displacement hulls.
Use calculator →VMG Calculator
Velocity made good toward a mark: boat speed × cos(angle off bow to the mark).
Use calculator →Fuel Range Calculator (Nautical Miles)
Estimate range in nautical miles from cruising speed, fuel aboard, and consumption rate.
Use calculator →Anchor Shackle to Feet Calculator
Convert anchor chain shackles (15 fathoms each) to total feet of rode.
Use calculator →Bilge Pump Time Calculator
Minutes to move a volume at a given pump rate (US gal, GPM).
Use calculator →Feet of Rode to Shackles
Convert deployed rode length in feet to standard anchor shackles (90 ft each).
Use calculator →Sail Area to Displacement Ratio
Classic ratio SA ÷ DISPL^(2/3) with displacement in pounds (not long tons).
Use calculator →Capsize Screening Factor
Simple beam / (DISPL/64)^(1/3) style screening number (displacement in pounds).
Use calculator →