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Free tools

  • Port Distance CalculatorVoyage & Routing — Modelled sea routes across 111 ports (with canal options), plus a 5,966-port index: printed NGA Pub. 151 figures where listed, labelled straight-line estimates otherwise. Unsupported pairs are stated, not invented.
  • Multi-Leg Voyage BuilderVoyage & Routing — Chain up to eight ports into a voyage
  • Canal vs. Cape CalculatorVoyage & Routing — Suez or the long way around? Compare distance, time, fuel and voyage cost via the canal against the open-sea alternative
  • Voyage Time & ETA CalculatorVoyage & Routing — Sea-route transit duration and estimated time of arrival between ports at a chosen service speed and departure time.
  • Great-Circle & Rhumb-Line CalculatorVoyage & Routing — Distance, initial/final course and vertex on the great circle vs the constant-course rhumb line
  • Course to Steer CalculatorVoyage & Routing — CMG + current set/drift → heading to steer and speed over ground
  • ECA Zone CheckerVoyage & Routing — Does a port sit inside an Emission Control Area, and does the modelled route cross one? Screen against the five ECAs in force under MARPOL Annex VI.
  • TCE Voyage EstimatorChartering & Voyage Economics — Time Charter Equivalent for a voyage
  • Voyage EstimatorChartering & Voyage Economics — Full voyage P&L
  • Laytime & Demurrage CalculatorChartering & Voyage Economics — Allowed vs used laytime with excepted periods
  • Bunker Cost EstimatorChartering & Voyage Economics — Estimate voyage fuel consumption and bunker cost from sea-route distance, service speed, consumption rate and fuel price.
  • UKC & Squat CalculatorNavigation & Deck — Under-keel clearance with Barrass squat
  • Deck Officer ToolkitNavigation & Deck — Tide twelfths, anchor swinging circle, compass error and sea-service days
  • Vessel Identifier CheckerNavigation & Deck — IMO check-digit validation and MMSI→flag decode per ITU M.1180
  • Stowage Factor & Cargo IntakeCargo & Stability — Hold capacity and stowage factor → intake tonnes; deadweight breakdown; TPC draft→displacement check.
  • Ship Stability CalculatorCargo & Stability — KG shift on loading/discharging, free-surface correction, corrected GM vs the IMO 0.15 m minimum.
  • Hydrostatics CalculatorCargo & Stability — Displacement ⇄ volume, Cb/Cm/Cp, TPC and sinkage, and FWA/DWA density corrections
  • Slow Steaming CalculatorEngineering & Emissions — Speed vs fuel & CO₂ curve
  • Bunker Quantity CalculatorEngineering & Emissions — Volume × density × indicative VCF → bunker tonnes, plus daily propeller-slip reporting.
  • Voyage Emissions CalculatorEngineering & Emissions — Fuel burn and CO₂ per voyage on IMO carbon factors, with EEOI and AER efficiency metrics.
  • CII Rating EstimatorCompliance & Reference — Attained CII → A–E rating band. IMO G2 reference lines and G4 boundary vectors for all 12 ship-type categories, 2023–2026 factors.
  • EU ETS Cost EstimatorCompliance & Reference — Indicative EU Emissions Trading cost
  • FuelEU Penalty EstimatorCompliance & Reference — Compliance balance against the 91.16 gCO₂eq/MJ baseline and 2025–2050 limits, with indicative Annex IV penalty.
  • MASS Readiness AssessmentCompliance & Reference — Twelve-question gap screen across the six domains of the IMO MASS Code
  • Maritime Unit ConverterCompliance & Reference — Convert nautical miles, knots, tonnes, cubic metres, TEU and FEU
  • CPA & TCPA CalculatorNavigation & Deck — Closest point of approach and time to CPA from relative bearing, range and both courses and speeds. Training and planning arithmetic, not a collision-avoidance tool.
  • Tank Capacity CalculatorCargo & Stability — Tank volume, fill and ullage at a sounding for rectangular and horizontal cylindrical tanks, with mass at a density. Approved tables override.
  • Sea-Service CalculatorCompliance & Reference — Add each contract: overlaps count once, and you get days, months and decimal months under the counting rule your administration uses.

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