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Sixty boating calculators, no sign-up
The numbers you need on the pontoon, and for each of them the question of what the result means for a contract.
30 July 2026New on nammert.comNAMMERT Assekuradeur GmbH
The toolbox collects sixty calculators: anchor chain, range on the rule of thirds, Beaufort and wave height, antifouling quantity, battery capacity, service intervals, safe depth, survival time in cold water and more. All of them use the standard formulas of seamanship. No sign-up, no email address, nothing stored.
What sets them apart from other collections is the second half of each page. It explains what the result means when a contract is read later. Take the service planner: a documented oil change moves the discussion after an engine failure away from the question of wear and towards the question of what actually happened, and that is a different conversation with a surveyor.
Several of them are built for the situations a visiting crew runs into rather than a local one. The lock time calculator matters on inland waterways where a day stage is set by the number of chambers, not by distance. The safe depth calculator matters where the chart datum and the actual water level diverge, which is most of the Baltic in an easterly.
For the common types there are preset versions: range for a jet ski assumes 70 litres and 35 litres per hour, for a motor yacht 900 and 90. Those presets are averages and no substitute for your own fuel log, which is why each page says so.
Common questions
Do I need an account?
No. The calculators run in the browser, nothing is stored and nothing is asked for, not even an email address.
Which units do they use?
Metric by default, with conversion where the practice is mixed, for example depth in metres and feet and speed in knots.
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