All Marine Calculators
20+ professional calculators for boaters, sailors, and marine enthusiasts.
Performance & Speed
Calculate hull speed, fuel consumption, and vessel performance
Hull Speed Calculator
Calculate theoretical maximum hull speed and speed/length ratio for displacement vessels.
Fuel & Range Calculator
Estimate fuel consumption, range, and endurance based on engine parameters.
Displacement Calculator
Calculate vessel displacement from dimensions and block coefficient.
Fuel Consumption
Calculate fuel burn rate, cost per mile, and optimal cruising speed.
Navigation
Navigation calculations for passage planning and position fixing
Distance & Bearing
Calculate great circle distance and initial bearing between two coordinates.
Coordinate Converter
Convert between decimal degrees and degrees/minutes/seconds formats.
ETA Calculator
Calculate estimated time of arrival based on distance and speed.
Compass Deviation
Convert between true, magnetic, and compass headings. TVMDC calculations.
Tidal Current
Calculate tidal current speed using Rule of Twelfths for passage planning.
Anchoring & Ground Tackle
Anchor sizing, scope calculation, and ground tackle selection
Anchor Scope Calculator
Calculate required rode length based on depth, freeboard, and conditions.
Chain Weight Calculator
Calculate anchor chain weight for different sizes and lengths.
Swing Radius Calculator
Determine anchor swing circle for safe clearance planning.
Anchor Chain Sizing
Calculate proper chain size and length based on boat displacement and use.
Weather & Wind
Wind calculations and weather interpretation tools
Electrical & Systems
Size batteries, solar panels, and marine systems
Battery Bank Calculator
Size house and starting batteries based on electrical loads and autonomy.
Solar Panel Calculator
Size marine solar systems based on loads, latitude, and mounting options.
Bilge Pump Sizing
Calculate bilge pump capacity based on boat size and flooding scenarios.
Watermaker Sizing
Size a desalinator based on crew size, consumption, and cruising style.
Reference
Quick reference guides and nautical data tables