Useful answers.
Understand the working.
Calculators and worksheets for the subjects you study and the problems you meet in practice. Work through an example, try your own values, then test the same ideas in exam practice.
Speed distance time calculator
Solve a constant-speed passage-time exercise using nautical miles and knots. Distinguish speed over ground from speed through water before applying the relation.
Open tool →FREE TOOLFuel endurance calculator
Deduct an independently selected reserve before estimating endurance. Compare a constant-rate range estimate with the reasons real voyage consumption can differ.
Open tool →FREE TOOLDisplacement and buoyancy calculator
Relate submerged volume to displaced mass and upward force using the appropriate water density. Do not turn displacement arithmetic into a vessel-stability assessment.
Open tool →FREE TOOLTank content calculator
Read liquid depth correctly in a rectangular or horizontal cylindrical tank. The curved-tank fill fraction is not generally equal to depth divided by diameter.
Open tool →FREE TOOLPump transfer calculator
Check transfer duration and entered receiving capacity in an engine-room arithmetic exercise. Leave line-up, valve sequence and operational authorisation to the applicable procedure.
Open tool →Tools that connect the calculation to the concept
Each tool shows its method, units and assumptions, together with two worked examples. Example values are for learning; replace them with your own measurements or documented inputs. The related study links take you to the matching certification topic on Marine Exam.
Worksheets run in your browser. We do not send entered measurements or report text to a calculation service. Where export is available, you choose when to save the file locally.
Check the boundary of the answer
A useful result starts with the right inputs and an appropriate method. These tools explain what is calculated and what the method leaves out. User-supplied criteria remain identified as supplied criteria; a calculation does not automatically approve equipment, certify an inspection or establish regulatory compliance.