Marginal Abatement Cost

Marginal abatement cost (MAC) ranks decarbonisation measures by $ per tonne of CO₂ avoided - slow steaming, hull cleaning, WHR, LNG, methanol, RFNBO. Sort ascending, cumulate against abatement needed, and you have the optimal-sequence stack.

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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

\text{MAC} = \frac{\text{Capex}_\text{annual} + \text{Opex}_\text{extra} - F_\text{saved} \cdot P_\text{fuel}}{C_\text{avoided}}

Symbol	Meaning	Unit
$MAC$	Marginal abatement cost	USD / t CO₂
$\text{Capex}_\text{annual}$	Annualised capital cost (loan + depreciation)	USD / year
$\text{Opex}_\text{extra}$	Incremental annual operating expense	USD / year
$F_\text{saved}$	Fuel saved by the measure	t / year
$P_\text{fuel}$	Bunker price	USD / t
$C_\text{avoided}$	CO₂ avoided	t / year

Source: DNV - *Maritime Forecast / Pathways to zero-carbon shipping*; IMO MEPC.80/7/8 - IMO GHG strategy levers

In short

$/t CO₂ for a shipping decarbonisation measure - rank measures ascending to build the MAC curve.

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