Crude Oil Tanker CII

Fast CII rating for crude oil tankers (VLCC, Suezmax, Aframax, Panamax). Uses the MEPC.337(76) tanker reference line (a=5247, c=0.610) and MEPC.339(76) tanker d-boundaries. Capacity basis is DWT.

Ship typeTankerCII

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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{CII}_\text{attained} = \frac{\sum_j F_j \cdot C_{f,j} \cdot 10^6}{\text{DWT} \cdot D}

Symbol	Meaning	Unit
$F_j$	Mass of fuel $j$	t
$C_{f,j}$	CO₂ factor of fuel $j$	t CO₂ / t fuel
$DWT$	Deadweight tonnage	t
$D$	Distance	nm
$Z$	Annual reduction - 5/7/9/11 %	fraction

Source: IMO Resolution MEPC.337/338/339(76); MEPC.364(79) - Cf factors

In short

Compute a crude oil tanker's CII rating - Attained, Required, and A–E grade - using the MEPC.337/338/339 tanker reference.

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