Bunker ROB, Range & Endurance Calculator
Turn remaining-on-board fuel into a practical voyage fuel position. Calculate safe steaming endurance, maximum range, voyage consumption, arrival ROB and minimum bunker uplift while protecting the reserve you choose. Advanced mode tracks multiple liquid fuel grades separately, keeps unpumpable fuel outside the usable reserve, identifies the limiting grade and stress-tests weather, adverse current and port delay.
Current Fuel Position
Nine inputs answer the core range and bunker question.
Voyage & Operating Basis
Speed over ground is through-water speed plus entered average current. Route allowance increases effective distance.
Fuel Grade Register
Track each liquid fuel grade independently. The first sea-consuming grade to reach its protected floor controls modeled safe endurance and range. Protected floor = arrival reserve + unpumpable fuel.
| Use | Fuel grade | ROB MT | Planned uplift MT | Sea burn MT/day | Port burn MT/day | Arrival reserve MT | Unpumpable MT |
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Stress Scenario Register
Each case is recalculated against the same ROB and planned bunker uplifts. Use it to see how added weather margin, current and delay change the limiting range and minimum uplift.
| Use | Scenario type | Sea margin delta % | Current delta kn | Extra port days |
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