Voyage estimation calculator

Same speed every leg applies the voyage speed to the whole rotation, the quick way to test it. Speed per leg shows once the voyage has a stop on the way, and lets you set a speed for each leg, for example a slower ballast leg or a faster leg to make a berth window. A leg without its own speed uses the voyage speed.

Schedules, berth windows and port agents work in the port's local time, so each arrival and departure is shown in the time zone of that port, including daylight saving. The UTC offset is shown beside it, so two ports' times can be compared directly.

For a quick estimate, one all-in figure: the hire or charter rate for a chartered vessel, or crew, maintenance and capital cost for an owned one, plus fuel. It applies to every day, at sea and in port. To price fuel separately, enter it under detailed costs and leave fuel out of the daily figure.

From the heavy fuel and diesel you enter: each tonne burned gives 3.114 or 3.206 tonnes of CO2. A leg between two EU or EEA ports counts in full, a leg into or out of the EU or EEA counts half, and time at berth in an EU or EEA port counts in full. Multiply by the carbon price you enter. Only CO2 is counted: methane and nitrous oxide, counted from 2026 and adding about 1.5% on these fuels, are left out. The EU ETS applies to ships of 5,000 GT and over; the UK ETS, the transshipment-port rule and outermost regions are not modelled.

Yes. Tick Avoid Suez and every leg that would transit the canal goes round the Cape of Good Hope; Avoid Panama works the same way, and Avoid war-risk areas keeps the legs out of the listed areas wherever the calls allow. To make the ship pass a point, add a position as a stop, such as 36.1, 14.5: it becomes a waypoint with no port days and no port charges, and the EU carbon cost still runs between the real calls either side.

Daily earnings, or time charter equivalent, are the freight less commission and the voyage costs (fuel, port charges, canal tolls, insurance and EU carbon), divided by every day of the voyage, loading and discharge included. The ship cost per day and lube stay out, because the owner pays them whether the ship runs a voyage or goes on time charter. That is what makes the figure comparable with a daily hire rate, which the calculator shows side by side with the freight rate that breaks even.

The route gives the miles of each leg inside an emission control area; divided by the speed, that is the days inside. Without a scrubber, the heavy fuel burned on those days, at a quay inside an ECA and at berth in the EU is replaced by gas oil, at the gas oil price and its CO2 factor. With a scrubber nothing changes. The Mediterranean has been an emission control area since 1 May 2025.

Heavy fuel at sea goes with the cube of the speed: 20% slower burns about half as much a day, over a longer voyage. Gas oil at sea runs the generators and stays as entered. It is a rule of thumb that is close for most ships over a few knots; for a firmer answer, run the voyage at the eco speed with the ship's own consumption at that speed.

Yes. Save keeps the voyage in this browser, on this computer, and lists it here next time; you can delete one or clear them all, or compare two or more side by side. Nothing is sent to us. To send a voyage to someone, Share link copies a short link; your costs go in it only if you tick the box.

From the zones and seasonal areas of the International Convention on Load Lines, as amended, for ships over 100 m. For each leg we find where the route enters and leaves each zone, turn that into dates at the leg's speed from your sailing date, and read the zone's season on those days. The strictest mark over the voyage comes first. Without a sailing date you see each zone's seasons instead. For planning only: the ship's load line certificate governs.

From the IMO's Fourth GHG Study (2020), which averages the 2018 world fleet by ship type and size: speed at sea, days at sea and fuel burned in a year. We turn the year into tonnes a day at sea and at the quay. They are a starting point, not your ship. Change any figure and save it as your own ship; it stays in this browser only.