Maritime tools
Maritime tools & calculators
The calculators our own team reaches for: Suez Canal tolls, CII and EU ETS, laytime, sea time, passage planning and deck-officer formulas, all built on official sources.
Chartering & Voyage
Canal dues, laytime, ETAs and bunkers: the numbers behind every fixture and voyage estimate.
Suez Canal Toll Calculator
Estimate Suez Canal transit dues by vessel type, condition and SCNT, in SDR and USD.
Laytime & Demurrage Calculator
Allowed vs used laytime with exceptions, then demurrage or despatch due, with a laytime statement.
Voyage ETA Calculator
ETA from distance and speed with time zones, or the speed needed to arrive on time.
Fuel Consumption & Cost Calculator
See how speed changes daily fuel burn, voyage bunkers, cost and CO₂, including slow steaming.
Compliance & Emissions
IMO CII ratings and EU ETS costs, the two carbon rules every owner now budgets for.
Seafarers & Deck Officers
Sea service records, squat, load line allowances and quick nautical conversions.
Sea Time Calculator
Add up sea service from sign-on/sign-off dates, and count days at sea in any year or tax period.
Ship Squat Calculator
Maximum squat in open water or a confined channel, dynamic under-keel clearance and safe speed.
FWA & DWA Calculator
Fresh water and dock water allowance for any dock density, and the extra cargo you can load.
Nautical Unit Converter
Knots to km/h, mph and m/s; nautical miles to km and miles; metres to feet and fathoms.
Why these tools
Made by a ship manager, for the people who run ships
SENA Ship Management has managed ships from Ismailia, on the Suez Canal, for more than 20 years. These calculators put the same arithmetic we use every day in the hands of owners, charterers, cadets and seafarers.
- Built on official sources: IMO resolutions, EU law and Suez Canal Authority circulars
- Reviewed whenever the rules change, with the review date on every page
- No sign-up, and your figures never leave your browser
Work with SENA
Need more than a calculator?
From CII improvement plans to chartering and crewing, SENA's team can take the numbers off your desk. Tell us what you need.