EEDI Reference Line

Look up the baseline reference line for any ship type - a × Capacity^(−c) per MEPC.231(65)/328(76). Applies to EEDI and EEXI attained/required calculations.

IMODesignReference line

Ship typeCapacityDWT

Reference line: 4.357gCO₂ / t·nm

961.79 × Capacity^(−0.477)

Coefficient a: 961.79

Exponent c: 0.477

Changing the inputs requires JavaScript. The calculator above shows its default inputs and result. The formula, symbols, and regulatory sources are shown in the Formula section below.

Formula, assumptions, and limits

\text{Reference} = a \cdot \text{Capacity}^{-c}

Symbol	Meaning	Unit
$Reference$	Reference-line value	g CO₂ / (t·nm)
$a$	Ship-type constant
$c$	Ship-type exponent
$Capacity$	DWT or GT per ship type

Source: IMO MEPC.231(65); IMO MEPC.328(76)

In short

Look up the a, c coefficients and compute the EEDI reference line for any ship type and capacity per MEPC.231(65)/328(76).

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