Maritime Master CalcDeck
Utilities - Free
A full deck of maritime calculators in your pocket. Solve navigation, tide, stability, cargo, engineering and voyage problems in seconds with clear inputs and instant results. Built for mariners, cadets and yacht crews who need fast answers on board.
5.0 Stars
CalcDeck packs more than ninety maritime calculators into one fast, clean app. Whether you are working a tide, checking stability, estimating a voyage, or converting units, the answer is a few taps away, with clear inputs that show the method behind every result.
It is the calculator deck for the whole ship: bridge, engine room, cargo office, and cockpit. Every tool is cross-referenced against standard formulae, and each one is designed so you can follow the working, not just read a number.
Navigation, Celestial, and Tides
Navigation tools cover course to steer, great circle sailing, CPA and TCPA, set and drift, and estimated arrival times. Celestial navigation includes sight reduction, altitude corrections, meridian altitude, and Polaris latitude, while tidal calculators handle the rule of twelfths, secondary ports, under-keel clearance, and squat.
Stability, Cargo, and Engineering
Stability and cargo tools work GM, list, trim, tonnes per centimetre, displacement, free surface effect, and grain heeling. Engineering calculators cover fuel consumption, specific fuel oil consumption, bunker surveys, boiler efficiency, and fresh water generator output.
Commercial, Compliance, and Safety
Voyage estimators, time charter equivalent, freight, laytime, and demurrage tools handle the commercial side, while regulations and compliance calculators give indicative CII, EEDI, EEXI, EU ETS, and MARPOL figures. Safety tools include cold-water survival time, search patterns, and lifeboat capacity, alongside weather tools and twelve unit converters.
Small Craft Too
Yacht and small craft calculators cover anchor scope, hull speed, sail area ratios, and displacement to length, so CalcDeck earns its place on any chart table, from superyacht to weekender.
Thoughtful Details
Optional location autofill drops your latitude and longitude straight into navigation calculators, entirely on device and never transmitted. Favourites keep your most used tools one tap away, everything works offline, and there are no accounts, no ads, and no tracking.
Free and Pro
Twenty nine calculators are free, including every unit converter and the essentials from each category. A single one-time CalcDeck Pro purchase unlocks the full library forever. There is no subscription and nothing renews.
Who It Is For
Built for deck officers, cadets, engineers, superyacht crew, and serious sailors. Results are for training and reference and should always be verified against approved instruments, official tables, and the vessel's documentation before any operational use.
Part of the Maritime Master Family
Pair CalcDeck with Maritime Master OOW for the theory behind the numbers, Maritime Master Skipper for interactive chartwork practice, and Maritime Master Whiteboard for sketching the plan.
Frequently Asked Questions
Is CalcDeck Pro a subscription? No. Pro is a one-time purchase that unlocks every calculator permanently, restorable on all your devices.
How many calculators are free? Twenty nine, including all twelve unit converters, so you can rely on the core tools without paying anything.
Can I use the results operationally? Treat CalcDeck as a training and reference aid. Always verify results against certified instruments and official publications before making operational decisions.
Download CalcDeck free on the App Store for iPhone and iPad and keep ninety calculators in your pocket.