100+ Maritime Calculators

Deck, engine, compliance & utility tools — built for the bridge, engine room, and shore office.

⚓ Deck
⚙️ Engine
📋 Compliance
💰 Commercial
🛟 Safety
🔁 Converters
🧰 Utilities
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⚓ Deck

38 tools
Navigation, stability, cargo, mooring, and watchkeeping tools for deck officers.

Navigation

Speed / Time / Distance

Solve for any one value

Great Circle Distance

Distance & initial course

Rhumb Line Course

Mercator sailing calc

Compass Error

Variation + deviation

Set & Drift

Current effect on course

CPA / TCPA

Radar collision avoidance

Tidal Height

Height at given time

Sextant Altitude Correction

Celestial navigation

ETA Calculator

Estimated time of arrival

Stability & Naval Architecture

GM Calculator

Metacentric height

List & Trim

Quick stability check

Draft Survey

Displacement calculation

Free Surface Effect

Tank liquid stability loss

Angle of Loll

Negative GM check

TPC / MCTC

Tonnes/cm & trim moment

Squat Calculator

Shallow water effect

Dry-Dock Stability

Critical period check

Cargo Operations

Ullage to Volume

Sounding table conversion

Bale / Grain Capacity

Cargo hold volume

Deadweight Scale

Draft to DWT lookup

Load Line / Freeboard

Compliance check

VCF Calculator

Oil cargo temp correction

Container Stack Weight

Stack load limits

Mooring & Anchoring

Anchor Chain / Scope

Required scope by depth

Mooring Line Tension

MBL safety factor

Windage Area

Wind force estimate

Weather

Beaufort Scale Converter

Wind speed to scale

True vs Relative Wind

Wind triangle solver

Barometric Pressure Trend

Storm warning indicator

Wind Chill Calculator

Apparent temperature

Watchkeeping & Certification

NRI Days Calculator

Indian seafarer residential status

Rest Hours Calculator

STCW/MLC compliance

Sea Time Calculator

CoC service tracking

Watch Schedule Generator

Rotation planner

Passage Plan Checklist

Appraisal to monitoring

UKC Calculator

Under keel clearance

Parallel Indexing

Radar clearance distance

Turning Circle Estimator

Advance & transfer

Pilot Card Generator

Maneuvering data sheet

⚙️ Engine

23 tools
Engine room, electrical, and maintenance tools for marine engineers.

Engine Performance

Fuel Consumption

SFOC-based calculator

Bunker ROB

Remaining on board

Power / Torque / RPM

Engine relationships

Indicated Power (IHP)

From indicator diagram

Purifier Throughput

Separation efficiency

Pump Head / Capacity

Flow rate calculation

Cylinder Oil Feed Rate

g/kWh dosing

Crankshaft Deflection

Log & trend analysis

Boiler Efficiency

Heat balance check

Electrical

Ohm's Law Calculator

V, I, R, Power

Generator Load Sharing

kW distribution

Cable Sizing

Current-carrying capacity

Battery Backup Time

Ah to hours

Insulation Resistance Log

Megger trend tracker

Maintenance

Paint Coverage

Area vs liters needed

Anode Consumption

Estimated depletion rate

Dry-Dock Cost Estimator

Budget planning

Lubricant Change Interval

Running hours tracker

PMS Interval Tracker

Next due hours / days

Spare Parts Reorder Point

Stock level calculator

Refrigeration & HVAC

Refrigerant Charge Calculator

System charge estimate

Cooling Load Estimator

Reefer container BTU

Superheat / Subcooling

System performance check

📋 Compliance

10 tools
IMO regulation and environmental compliance calculators.

EEXI Calculator

IMO efficiency index

CII Calculator

Carbon intensity rating

Ballast Water Exchange

Sequential/flow-through

Sulphur Blend Calculator

ECA fuel compliance

Fuel Changeover Timing

ECA entry planning

ISPS Security Checklist

Level-based checklist

SEEMP Tracker

Efficiency management plan

MARPOL Annex VI Checker

Emission compliance

Garbage Record Book Calc

Disposal category tracker

Port State Control Prep

Inspection checklist

💰 Commercial & Voyage

10 tools
Voyage cost, chartering, and port documentation tools.

Voyage Cost Estimator

Fuel + port charges

Laytime Calculator

Charter party timing

Demurrage / Dispatch

Cost calculation

Bunker Cost Comparison

Cross-port pricing

Charter Party Day Counter

Duration tracker

Port Dues Estimator

Approx port cost

Statement of Facts Timer

Event duration log

Notice of Readiness

NOR timing calculator

Freight Rate Calculator

$/tonne to total revenue

Canal Toll Estimator

Suez/Panama transit cost

🛟 Safety & Emergency

10 tools
Emergency response and safety compliance calculators.

Man Overboard (Williamson Turn)

Recovery maneuver

SAR Search Pattern

Search area planning

Fire Water Flow Rate

Firefighting capacity

Lifeboat Capacity

SOLAS check

Muster Time Tracker

Drill duration log

GMDSS Distress Message

Message generator

VHF Channel Reference

Quick lookup

1500-Mile Storm Rule

Avoidance helper

Enclosed Space Entry Check

Atmosphere test log

Piracy Risk Zone Checker

High-risk area lookup

🔁 Unit Converters

12 tools
Quick reference conversions used across deck and engine work.

Nautical Unit Converter

NM, knots, m³, MT

Density / API Gravity

Oil cargo conversion

Temperature Converter

°C / °F / K

Pressure Converter

Bar, psi, kPa

Draft Converter

Imperial ↔ metric

Torque Unit Converter

Nm, lb-ft

Weight Converter

MT, LT, kg, lb

Volume Converter

m³, barrels, gallons

Length Converter

Feet, meters, fathoms

Speed Converter

Knots, km/h, m/s

Power Converter

kW, HP, BHP

Angle Converter

Degrees, radians, points

🧰 General Utilities

8 tools
Everyday tools — not maritime-specific.

PDF Merge / Split

Combine or separate PDFs

Image to PDF

Convert images to PDF

Word / Excel to PDF

Basic Office conversion

QR Code Generator

Create scannable codes

Image Compressor

Reduce file size

Word Counter

Text & character count

Age / Date Calculator

Duration between dates

Currency Converter

Live exchange rates

Time Zone Converter

Port arrival planning