EEXI Attained - Energy Efficiency Existing Ship Index

Existing-ship EEDI variant. Same formula; reference speed is derived at 75 % MCR of the limited (EPL or ShaPoLi) engine power.

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{EEXI}_\text{attained} = \frac{\sum_i P_{\text{ME},i}^{\text{lim}} \cdot C_{f} \cdot \text{SFC} + P_\text{AE} \cdot C_{f,\text{AE}} \cdot \text{SFC}_\text{AE}}{\text{Capacity} \cdot V_\text{ref}^{\text{lim}}}

Symbol	Meaning	Unit
$\text{EEXI}_\text{attained}$	Attained Energy Efficiency eXisting-ship Index	g CO₂ / (t·nm)
$P_{\text{ME},i}^{\text{lim}}$	75 % of limited MCR of main engine $i$ after EPL / ShaPoLi	kW
$C_f$	CO₂ conversion factor for main-engine fuel	t CO₂ / t fuel
$\text{SFC}$	Main-engine specific fuel consumption at reference load	g / kWh
$P_\text{AE}$	Auxiliary-engine power	kW
$C_{f,\text{AE}}$	CO₂ conversion factor for auxiliary-engine fuel	t CO₂ / t fuel
$\text{SFC}_\text{AE}$	Auxiliary-engine specific fuel consumption	g / kWh
$Capacity$	DWT (cargo) or GT (passenger / cruise)	t or -
$V_\text{ref}^{\text{lim}}$	Reference speed derived at 75 % of the limited power	kn

Source: IMO MEPC.328(76) - revised MARPOL Annex VI including EEXI; IMO MEPC.364(79) - Cf conversion factors

Compute Attained EEXI, Required EEXI, and compliance margin for existing ships under IMO MEPC.328(76). EPL and ShaPoLi ready.