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Hull speed, fuel burn rate, anchor rode, displacement, tide estimator, and boating calculators.
Estimate fuel consumption from engine HP, load, and fuel type.
Calculate maximum displacement hull speed from waterline length.
Calculate anchor rode length from water depth and conditions.
Estimate boat displacement from dimensions and block coefficient.
Calculate total sail area from mainsail and jib dimensions.
Estimate tide height at any time using the rule of twelfths.
Calculate speed in knots from distance and time, or time from speed.
Calculate nautical miles between two coordinates using Haversine.
Calculate monthly payments for marine financing.
Calculate nautical range from tank capacity and burn rate.
Calculate theoretical hull speed from waterline length.
Calculate anchor rode length from water depth and conditions.
Estimate hull displacement from dimensions and block coefficient.
Calculate distance between two lat/lon coordinates in nautical miles.
Calculate true heading from compass heading and deviation.
Look up wind conditions by Beaufort scale number.
Estimate wave height from wind speed, duration, and fetch.
Convert between knots, mph, and km/h for marine navigation.
Determine recommended anchor size and type from boat length and weight.
Calculate anchor chain scope needed from water depth and conditions.
Estimate fuel consumption for a boat trip from speed, distance, and engine specs.
Calculate theoretical hull speed from waterline length for displacement vessels.
Calculate vessel displacement from hull dimensions and draft.
Calculate total sail area from mainsail and jib dimensions.
Calculate beam-to-length ratio to evaluate hull stability and speed.
Estimate vessel draft from displacement, beam, and hull shape.
Calculate gross and net tonnage from vessel internal volume.
Calculate distance in nautical miles between two coordinates.
Calculate compass bearing between two geographic coordinates.
Estimate tidal range from high and low tide heights and timing.
Estimate wave height from wind speed, fetch, and duration.
Calculate water pressure at a given depth in fresh or salt water.
Calculate theoretical boat speed from propeller pitch and RPM.
Estimate maintenance costs based on engine hours and service intervals.
Estimate marina slip rental cost from boat length and location type.
Calculate monthly boat loan payments from price, rate, and term.
Estimate annual boat insurance cost from value, type, and usage.
Calculate vessel cruising range from fuel capacity and consumption rate.
Reference sea state codes with wave height and description for voyage planning.
Reference Beaufort wind scale with speed ranges and sea conditions.
Calculate wave period from wavelength and water depth.
Calculate effective boat speed accounting for current speed and direction.
Estimate tide height between high and low water using the rule of twelfths.
Calculate mooring line length and diameter from vessel size and conditions.
Determine fender size from vessel length, beam, and displacement.
Calculate bilge pump capacity from hull volume and safety factor.
Calculate through-hull fitting size from flow rate requirements.
Calculate watermaker capacity needed from crew size and daily consumption.
Calculate holding tank size from crew count and pump-out interval.
Calculate fresh water tank capacity from crew size and voyage duration.
Calculate fuel tank capacity from range, speed, and consumption rate.
Calculate trim tab size from boat length, beam, and speed range.
Calculate propeller slip percentage from theoretical and actual speed.
Check propeller cavitation risk from RPM, diameter, and immersion depth.
Calculate stern drive gear ratio from engine RPM and prop speed.
Calculate shaft alignment tolerances from shaft length and diameter.
Determine cutlass bearing size from shaft diameter and bearing length.
Reference for sail types: mainsail, jib, genoa, spinnaker, and storm sails.
Reference for rigging: standing rigging, running rigging, and hardware components.
Reference for essential knots: bowline, cleat hitch, clove hitch, and figure eight.
Reference for anchor types: plow, fluke, mushroom, and grapnel with sizing guides.
Reference for hull types: displacement, planing, semi-displacement, and catamaran.
Reference for keel types: fin, full, bulb, wing, and centerboard configurations.
Reference for rudder types: spade, skeg-hung, transom-hung, and balanced rudders.
Reference for propeller types: fixed, folding, feathering, and variable pitch props.
Reference for marine engines: inboard, outboard, sterndrive, and jet drive systems.
Reference for navigation light rules: colors, arcs, and requirements by vessel size.
Reference for international maritime signal flags and their meanings.
Reference for VHF marine radio channels: calling, working, and emergency frequencies.
Reference for international code of signals: alphabet flags and numeral pennants.
Reference for buoy types: lateral, cardinal, special, and isolated danger marks.
Reference for lighthouse types: fixed, flashing, and sector light characteristics.
Reference for compass types: magnetic, gyro, fluxgate, and GPS compass systems.
Reference for nautical chart symbols: depths, hazards, aids, and shoreline features.
Reference for weather routing principles: GRIB files, routing software, and strategies.
Reference for passage planning: waypoints, tidal gates, and contingency planning.
Reference for crew roles: skipper, first mate, navigator, helmsman, and deck hand duties.
Reference for marine safety equipment requirements by vessel size and waters.
Reference for life raft types: coastal, offshore, and SOLAS-approved with sizing.
Reference for marine flare types: handheld, parachute, and smoke signals with expiry rules.
Reference for marine fire extinguishers: types, sizes, and placement requirements.
Reference for marine first aid kit contents and emergency procedures at sea.
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