Marine calculators for sea service, ETA, fuel, and rest hours
Practical maritime calculators for seafarers, cadets, officers, and vessel operations where clear numbers matter more than guesswork.
7
marine tools
24h
rest screening
NM
voyage planning
Sea Service Calculator
Calculate total sea service time in days, months, and years from vessel embarkation and disembarkation dates.
Knot Speed Converter
Convert nautical speeds (knots) to kilometers per hour (km/h), miles per hour (mph), and meters per second (m/s).
Vessel ETA Calculator
Calculate Expected Time of Arrival (ETA) based on voyage distance, vessel speed, and departure time.
Bunker Fuel Consumption Calculator
Estimate total fuel consumption for voyages based on daily consumption rates and passage times.
Watchkeeping Rest Hours Calculator
Screen a 24-hour rest schedule against common STCW rest-hour thresholds and identify records that need review.
STCW Certificate Expiry Tracker
Check certificate time remaining and see clear expired, urgent, upcoming, or valid renewal status indicators.
Maritime CV Builder
Structure rank, certificates, vessel experience, sea service, and professional profile into clean maritime CV text.