200 professional calculators based on ABYC/USCG standards
Calculate ballast requirements for proper vessel trim and stability. Size ballast tanks and determin
Calculate watertight bulkhead requirements for vessel subdivision and damage stability
Calculate hull deadrise angle effects on impact loads, stability, and ride quality
Calculate boat displacement from dimensions. Estimate vessel weight using length, beam, draft, and b
Calculate vessel draft changes from loading, estimate trim angles, and determine weight placement fo
Calculate minimum freeboard requirements based on vessel length and type per load line rules
Calculate hull frictional and wave-making resistance using Holtrop method estimates
Calculate theoretical maximum hull speed and speed/length ratio for displacement vessels. Essential
Advanced hull speed calculator with displacement analysis, semi-displacement speed estimates, and pe
Calculate hydrostatic properties including buoyancy, waterplane area, and center of buoyancy
Calculate planing threshold speed, power requirements, and speed-length ratio
Calculate GZ righting arm curve for vessel stability analysis at various heel angles
Analyze vessel sea keeping ability. Calculate comfort ratios, motion periods, and seaworthiness metr
Calculate metacentric height (GM) and initial stability for vessels. Estimate stability based on ves
Calculate proper trim tab size for your boat. Size tabs based on boat length, beam, weight, and hull
Calculate gross tonnage, net tonnage, and displacement tonnage for vessels. Simplified tonnage measu
Calculate waterline length, prismatic coefficient, and block coefficient from hull dimensions
Calculate proper bow thruster or stern thruster sizing based on boat length, displacement, and winda
Calculate engine alignment
Track marine engine hours and calculate maintenance intervals. Plan oil changes, impeller replacemen
Calculate engine mount deflection, isolation frequency, and bolt sizing
Calculate fuel consumption, range, and endurance for boats. Estimate GPH based on horsepower and eng
Calculate fuel consumption rate at various engine loads and estimate range
Calculate marine fuel consumption rates, cost per mile, and optimal cruising speed. Compare fuel eff
Calculate marine fuel tank capacity from dimensions. Includes weight calculations for diesel and gas
Calculate jet drive thrust, nozzle velocity, and impeller sizing for waterjet propulsion
Calculate raw water cooling system requirements for marine engines. Size sea strainers, hoses, and w
Calculate exhaust hose diameter and waterlock sizing for wet exhaust systems
Calculate optimal propeller pitch, diameter, and gear ratio for your boat. Achieve proper RPM range
Calculate propeller shaft alignment tolerances and check shaft runout. ABYC standards for engine-to-
Calculate propeller shaft diameter based on engine power, RPM, and material per ABYC P-6
Size propeller diameter and pitch for displacement and planing hulls
Calculate propeller slip percentage and theoretical vs actual speed. Optimize prop selection for bet
Calculate gear ratio, output RPM, and torque multiplication for marine transmissions
Calculate optimal sterndrive trim angle for speed and fuel efficiency
Calculate shore power load, voltage drop, and cord sizing for 30A/50A marine service connections
Calculate AIS signal range based on antenna height and transmitter power class
Size marine alternator output for charging needs based on battery bank and loads
Calculate VHF radio range based on antenna height above water at both stations
Calculate battery charger amperage needs based on bank capacity and charging profile
Estimate battery state of charge from voltage and specific gravity readings
Calculate bonding conductor sizing per ABYC E-11 for corrosion protection circuits
Calculate wire gauge and fuse sizing for 12V/24V DC marine systems per ABYC E-11
Analyze galvanic series compatibility and corrosion risk between dissimilar metals on boats
Calculate GFCI/ELCI requirements and analyze leakage current for marine AC systems
Size marine inverter based on AC load requirements, surge capacity, and battery draw
Calculate marine LED lighting layout, total lumens, and power draw for boat spaces
Calculate lightning protection zone of protection and conductor sizing per ABYC E-4
Calculate battery bank size for boats. Size house and starting batteries based on electrical loads,
Size your marine battery bank with detailed load analysis. Calculate house and starting battery requ
Calculate proper marine DC wire gauge based on current, length, and voltage drop. ABYC E-11 complian
Calculate total electrical load for your boat. Size battery banks, alternators, and charging systems
Calculate solar panel size for boats. Size marine solar systems based on electrical loads, battery b
Size solar panel array for marine battery charging considering sun hours and panel orientation at se
Calculate DC voltage drop for marine wiring using the 3% rule per ABYC E-11
Calculate navigation light requirements, visibility range, and power consumption per COLREGS
Calculate shore power needs, cord sizing, and breaker requirements per ABYC E-11
Calculate wind generator power output at various wind speeds and estimate daily energy
Calculate CO detector placement requirements and alarm thresholds for marine installations
Analyze one and two compartment flooding survival using permeability and buoyancy reserve
Compare effectiveness and range of various marine distress signal types
Estimate EPIRB/PLB coverage area, satellite pass frequency, and SAR response time
Calculate fire/smoke detector placement requirements per NFPA 302 for marine vessels
Calculate USCG fire extinguisher requirements by vessel length and configuration
Track required pyrotechnics inventory and expiration dates per USCG regulations
Calculate rate of flooding through hull breach based on hole size and depth below waterline
Determine life raft capacity requirements based on vessel size, crew, and voyage category
Calculate search pattern radius, drift, and time to hypothermia for man overboard situations
Calculate maximum persons capacity per USCG formula for boats under 26 feet
Calculate life jacket requirements per USCG regulations by vessel size and occupants
Generate required safety equipment list by vessel class, length, and operating area
Determine required sound signaling equipment by vessel length per COLREGS Rule 33
Check vessel stability against USCG/IMO intact stability criteria
Calculate gross and net tonnage per International Tonnage Convention (ITC 69)
Calculate engine room ventilation requirements per ABYC H-32 and USCG regulations
Calculate backstay tension for mast bend control and forestay sag reduction
Calculate force requirements for boom vang or kicking strap to control leech tension
Calculate loads on halyards and sheets from sail area and wind conditions
Calculate genoa or jib sizing with overlap percentage and LP measurement
Calculate optimal fairlead position for correct jib twist and shape
Calculate keel area, draft, and ballast ratio for sailboat stability
Calculate leeway angle from wind conditions, heel, and keel efficiency
Calculate optimal mast height for desired sail plan area and rig proportions
Determine when to reef based on wind speed, heel angle, and sail area reduction
Calculate standing and running rigging loads for sailboats. Size shrouds, stays, and halyards based
Calculate rudder area from hull dimensions for proper directional control
Calculate running rigging
Calculate total sail area for sloop, ketch, and cutter rigs including mainsail and headsail
Calculate center of effort vs center of lateral resistance for balanced helm
Calculate standing rigging loads on cap shrouds, lowers, and forestay
Calculate asymmetric and symmetric spinnaker dimensions from rig measurements
Analyze degree of weather or lee helm from sail plan and hull parameters
Calculate required winch power ratio for sheet loads and hand cranking effort
Predict weather changes from barometric pressure readings over time
Beaufort wind scale calculator and reference. Convert wind speed to Beaufort number with sea state d
Apply deviation and variation corrections to convert between true, magnetic, and compass headings
Calculate magnetic deviation and variation for compass navigation. Convert between true, magnetic, a
Convert between decimal degrees and degrees-minutes-seconds coordinate formats. Essential for naviga
Calculate Coriolis deflection force on ocean currents at different latitudes
Calculate course to steer and speed made good accounting for current set and drift
Calculate great circle distance and initial bearing between two coordinates. Essential navigation to
Calculate visible distance to the horizon based on height of eye above sea level
Calculate estimated time of arrival for marine passages. Plan your voyage timing based on distance a
Calculate great circle distance and initial bearing between two coordinates
Calculate dew point temperature and fog risk assessment for marine conditions
Calculate passage times, fuel requirements, waypoints, and provision needs for offshore and coastal
Calculate maximum radar detection range based on antenna height and target height
Calculate rhumb line (constant bearing) course and distance between two positions
Calculate wave height, period, and sea state from wind conditions. Douglas Sea Scale and wave foreca
Calculate velocity made good (VMG) toward destination, optimal tacking angles, and current set effec
Calculate sunrise, sunset, and twilight times from latitude and date for passage planning
Calculate tidal current speed and direction using the Rule of Twelfths. Plan passages around tidal s
Predict tide height at any time using the rule of twelfths between high and low water
Convert apparent wind to true wind speed and direction. Essential for sailing performance and weathe
Estimate visibility from weather conditions including precipitation, fog, and spray
Generate intermediate waypoints along a great circle route at specified intervals
Estimate wave height and period from wind speed, fetch distance, and duration
Calculate wind chill factor for marine conditions. Essential for cold weather boating safety.
Calculate proper anchor chain size and length based on boat displacement, cruising area, and anchori
Calculate anchor holding power based on bottom type, anchor style, and environmental conditions. Com
Calculate anchor rode length based on water depth, freeboard, and conditions. Essential for safe anc
Calculate proper anchor size based on boat length, displacement, and conditions. Includes rode lengt
Calculate proper anchor windlass size based on ground tackle weight and boat size. Includes electric
Calculate anchor chain weight by size and length. Compare different chain types and plan your ground
Calculate proper fender size and quantity for docking. Size boat fenders based on vessel weight, len
Calculate dockage cost
Calculate mooring line loads from wind and current forces. Size dock lines properly for safe boat mo
Calculate sea anchor sizing
Calculate anchor swing circle for safe clearance planning. Determine how much room you need when anc
Calculate towing bridle and line sizing for marine towing operations. Size towlines based on vessel
Calculate anti-fouling paint type selection, coverage area, and recoat timing for marine hulls
Calculate bilge pump capacity requirements based on boat size, hull type, and flooding scenarios. GP
Estimate haul-out costs, bottom paint, and preparation materials for a complete bottom job
Calculate antifouling paint coverage for boat bottoms. Estimate gallons needed based on hull dimensi
Calculate cathodic protection
Calculate cutlass bearing sizing, wear limits, and replacement criteria based on shaft diameter
Calculate davit load
Calculate engine oil capacity, filter sizing, and recommended change intervals for marine engines
Calculate layers of fiberglass cloth and resin quantities for structural hull repairs
Calculate freshwater tank sizing, pump capacity, and hot water heater requirements for vessels
Calculate fuel filtration rate and treatment schedule for diesel fuel maintenance
Calculate material quantities for gelcoat repair area including filler, hardener, and pigment
Calculate marine holding tank size requirements based on crew size, trip duration, and usage pattern
Estimate hull cleaning schedule, marine growth rate, and speed loss from biofouling
Calculate raw water pump impeller replacement schedule based on usage and operating conditions
Calculate BTU requirements for cabin cooling and heating on marine vessels
Calculate holding tank pump-out scheduling and capacity requirements per USCG regulations
Calculate paint coverage
Calculate marine refrigeration requirements based on box size, insulation, and conditions. Size comp
Calculate ventilation cfm
Calculate proper gyroscopic or fin stabilizer sizing for your vessel based on displacement, beam, an
Calculate stuffing box packing requirements and proper drip rate adjustment for shaft seals
Calculate teak board footage, caulking quantities, and fastener requirements for deck construction
Size a marine watermaker (desalinator) based on crew size, water consumption, and cruising style. Ca
Calculate antifreeze volume, fogging oil, and storage preparation requirements for marine engine win
Calculate zinc, aluminum, or magnesium anode sizing for cathodic protection. ABYC E-2 standards for
Calculate sacrificial anode consumption rate and optimal replacement schedule
Calculate boat lift capacity requirements including vessel weight and gear
Calculate dock bumper material, spacing, and energy absorption for vessel protection
Calculate proper cleat sizing and placement for vessel docking loads
Calculate dock line diameter, length, and material for secure vessel mooring
Calculate fender board sizing and placement for uneven dock faces and pilings
Calculate trip parameters, safety margins, and fuel reserves for voyage planning
Calculate gangway length and angle requirements for tidal range and ADA compliance
Calculate shore power pedestal requirements and electrical load for docked vessels
Calculate stern-to Mediterranean mooring requirements including anchor and line sizing
Calculate mooring buoy and tackle sizing for permanent vessel moorings
Calculate dock pile sizing for wind and current loads per ASCE 7 standards
Calculate side-by-side vessel tie-up loads and fender requirements for rafting
Calculate minimum slip dimensions for vessel including clearances per marina standards
Calculate spring line angles, lengths, and load distribution for surge control
Calculate anchor positioning for drift control and optimal fishing spot coverage
Calculate chum quantity, dispersion rate, and drift pattern for fishing
Calculate dive platform sizing, load capacity, and freeboard requirements
Calculate downrigger cable angle, actual depth, and weight requirements for trolling
Calculate transducer frequency vs maximum depth capability and cone angle coverage
Calculate optimal fishing line strength, drag settings, and breaking point for target species
Calculate stability characteristics based on hull width, shape, and paddler weight
Calculate livewell capacity and recirculation flow rate for keeping fish alive
Calculate fishing net mesh sizing, area, and buoyancy requirements
Calculate outrigger length, spread angle, and effective trolling width
Calculate rod holder placement angles and quantity for different vessel types and fishing styles
Calculate optimal trolling speed for target species based on lure type and water conditions
Calculate tuna tower height requirements, visibility range, and structural loads
Calculate wake tower structural load requirements and ballast for wakeboarding
Calculate bow thruster tunnel diameter and placement for effective maneuvering
Calculate chine angle effects on planing performance, stability, and spray deflection
Calculate cockpit drain sizing for rapid water evacuation per ABYC H-12
Calculate through-bolt loads and backing plate sizing for deck hardware installation
Calculate deck structural capacity by area based on intended use and construction
Calculate fairing compound quantities for hull surface preparation and repair
Compare fiberglass, aluminum, and steel hull weight and cost for vessel construction
Calculate keel bolt size, number, and torque for keel attachment on sailboats
Calculate portlight window sizing, thickness, and strength requirements
Calculate clearances around propeller in aperture or strut for vibration-free operation
Calculate rub rail sizing, fastener spacing, and mounting hardware for hull protection
Calculate hull panel thickness per ABS and ABYC rules for fiberglass construction
Calculate spray rail placement angle and dimensions for optimal spray deflection
Calculate hull stringer spacing, dimensions, and cross-section for structural support
Calculate transom structural requirements for outboard engine mounting per ABYC H-4