Crude Oil Tanker CII

Fast CII rating for crude oil tankers (VLCC, Suezmax, Aframax, Panamax). Uses the MEPC.353(78) tanker reference line (a=5247, c=0.610) and MEPC.354(78) tanker d-boundaries. Capacity basis is DWT.

Ship typeTankerCII

Ship & voyage

DeadweightDWTDistance travelled / yearnmReporting year

Fuel

Typical crude tanker burns VLSFO laden, MGO in ECAs. Use the bunker-mass totals from your IMO DCS report.

FuelMass burnedt

Attained CII: 6.177g CO₂ / (dwt·nm)

Required CII: 4.015g CO₂ / (dwt·nm)

Year Z = 9%

Rating: E

Inferior - SEEMP Part III corrective action plan required.

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{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.353(78), MEPC.338(76) as amended by MEPC.400(83), and MEPC.354(78); MEPC.364(79) - Cf factors

In short

Compute a crude oil tanker's CII rating - Attained, Required, and A–E grade - using the MEPC.353(78)/338/339 tanker reference.

Learn the theory Tanker Size Classes: MR to ULCC Explained