Product / Chemical Tanker CII

CII for clean-product (MR, LR1, LR2) and chemical tankers. Same MEPC.337 reference line as crude (a=5247, c=0.610) - tanker type is treated as one in the CII regime despite the different operational profile.

Ship typeTankerProduct

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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{required} = 5247 \cdot \text{DWT}^{-0.610} \cdot (1 - Z)

Symbol	Meaning	Unit
$DWT$	Deadweight	t
$Z$	Annual reduction	fraction

Source: IMO MEPC.337/338/339(76); INTERTANKO CII Q&A for product/chemical operators

In short

CII rating for product tankers (MR, LR1, LR2) and chemical tankers using the MEPC.337 tanker reference.

Learn the theory Tanker Size Classes: MR to ULCC Explained