Cruise Ship CII

CII for passenger cruise ships. MEPC.353(78) cruise reference (a=930, c=0.383), GT-based. Highest hotel load in the fleet - the CII denominator is GT (not pax) but the numerator covers every MW of on-board entertainment, HVAC, laundry, galley.

Ship typeCruise

Ship & voyage

Gross TonnageGTTypical modern cruise 100,000–220,000 GT (2,500–6,000 pax).Distance / yearnmYear

Fuel

New-build cruise typically LNG dual-fuel + scrubber (Royal Caribbean Icon, MSC World class). Older VLSFO + scrubber.

FuelMasst

Attained CII: 9.464g CO₂ / (GT·nm)

Required CII: 8.812g CO₂ / (GT·nm)

Rating: D

Minor inferior - corrective plan required after three consecutive years.

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{CII}_\text{required} = 930 \cdot \text{GT}^{-0.383} \cdot (1 - Z)

Symbol	Meaning	Unit
$GT$	Gross tonnage
$Z$	Annual reduction	fraction

Source: IMO MEPC.353(78), MEPC.338(76) as amended by MEPC.400(83), and MEPC.354(78); CLIA - cruise industry environmental report

In short

CII for cruise ships using the MEPC.353(78) cruise reference (a=930, c=0.383), GT-based.

Learn the theory Specialised Ship Types: Ro-ro, Reefer, Heavy-Lift