Professional Maritime Calculators & Shipping Utility Tools

Estimate nautical miles, kilometres and steaming time between major world ports with an adjustable routing margin.

Estimate vessel ETA from distance and speed, or compute the speed needed to meet a target arrival.

Calculate CBM, gross weight, and sea/air freight chargeable weight across multiple package types with cm/inch and kg/lb toggles.

Estimate total voyage bunker consumption and CO₂ emissions using official IMO carbon factors for HFO, LFO, MGO and LNG.

Convert between 20ft (TEU) and 40ft (FEU) containers and estimate total CBM and max payload for mixed fleets.

Preview laytime, demurrage and despatch amounts from allowed vs actual time used and agreed daily rates.

Check whether cargo will pass through a 20ft, 40ft or High Cube container door using standard ISO door dimensions.

Check whether dry bulk or breakbulk cargo will fit in a vessel hold using stowage factor, hold volume and broken stowage allowance.

Compare 3 vessel speed scenarios side-by-side — steaming time, ETA, and hours saved or lost vs standard speed — from a single voyage distance and departure time.

Convert cargo weights (MT/LT/ST), marine bunker volumes (MT/Liters/US Gallons/Barrels), and nautical depth units (meters/feet/fathoms) in one tool.

Instantly validate a 7-digit vessel IMO number using the standard SOLAS check-digit formula, with a full mathematical breakdown.