EEDI Attained - Energy Efficiency Design Index

Compute a new ship's attained EEDI per MEPC.328(76), the required EEDI for its type and phase, and the compliance margin. Design-phase metric for carbon efficiency per tonne-mile.

IMODesignMEPC.328(76)

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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{EEDI}_\text{attained} = \frac{\sum_i P_{\text{ME},i} \cdot C_{f,\text{ME}} \cdot \text{SFC}_\text{ME} + P_\text{AE} \cdot C_{f,\text{AE}} \cdot \text{SFC}_\text{AE} - \text{Innovative credit}} {\text{Capacity} \cdot V_\text{ref}}

Symbol	Meaning	Unit
$\text{EEDI}_\text{attained}$	Attained Energy Efficiency Design Index	g CO₂ / (t·nm)
$P_{\text{ME},i}$	75 % of MCR of main engine $i$	kW
$C_{f,\text{ME}}$	Fuel-to-CO₂ factor for main-engine fuel	t CO₂ / t fuel
$\text{SFC}_\text{ME}$	Main-engine specific fuel consumption at reference load	g / kWh
$P_\text{AE}$	Auxiliary-engine power	kW
$C_{f,\text{AE}}$	Fuel-to-CO₂ factor for auxiliary-engine fuel	t CO₂ / t fuel
$\text{SFC}_\text{AE}$	Auxiliary-engine specific fuel consumption	g / kWh
$Innovative credit$	CO₂ saving from Category B/C energy-saving technologies	g CO₂ / h
$Capacity$	DWT (cargo) or GT (passenger / cruise)	t or -
$V_\text{ref}$	Design speed at 75 % MCR on design draft	kn

Source: IMO Resolution [MEPC.328(76)](https://www.imo.org) - revised MARPOL Annex VI including Phase 3; IMO Resolution [MEPC.231(65)](https://www.imo.org) - 2013 Guidelines for reference lines; IMO Resolution [MEPC.364(79)](https://www.imo.org) - Cf fuel conversion factors; IMO Circular [MEPC.1/Circ.815](https://www.imo.org) - innovative-technology categories; IMO Resolution [MEPC.203(62)](https://www.imo.org) - original EEDI amendments (2011)

In short

Compute attained EEDI, required EEDI, and compliance margin for any new ship under IMO MEPC.328(76). Free, citation-backed, shareable.

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