Bunker Stem - Optimal Quantity

Optimal bunker-stem size given ROB, differential price between the current and next port, and safety margin - the basic lift/leave split that underpins bunker-economics routing.

BunkerVoyageEconomics

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This calculator requires JavaScript to compute its result. The formula, symbols, and regulatory sources are shown in the Formula section below.

Formula, assumptions, and limits

L = \max(c \cdot (d + s) - \text{ROB},\ 0)

Symbol	Meaning	Unit
$c$	Daily fuel consumption	t/day
$d$	Voyage duration	days
$s$	Safety margin	days
$ROB$	Remain on board	t

Source: BIMCO Bunker Terms

In short

Optimal bunker-stem size given ROB, differential price between the current and next port, and safety margin - the basic lift/leave split that underpins bunker-economics routing.

Learn the theory Bunker Quality and ISO 8217 Marine Fuel Standards