HomeCalculatorsCII Required - target carbon intensity for the year

CII Required - target carbon intensity for the year

Look up the annual Required CII for any ship - the reference line reduced by the year's Z factor under MEPC.337(76) and MEPC.338(76).

IMOOperationalMEPC.337(76)

Ship & year

Ship typeShip capacityDWTDeadweight for most cargo ships.Reporting yearPicks the MEPC.338(76) Z factor - 5 % in 2023 rising to 11 % in 2026.

Reference line

4.167gCO₂ / (dwt·nm)

a × Capacity^(−c) per MEPC.337(76) Table 1

Required CII

3.792gCO₂ / (dwt·nm)

Reference × (1 − 9 %)

Formula and assumptions

Required CII = a × Capacity^(−c) × (1 − Z)

a, c - ship-type reference-line coefficients from MEPC.337(76).
Z - annual reduction factor from MEPC.338(76): 5 % (2023), 7 % (2024), 9 % (2025), 11 % (2026).
Capacity is deadweight (DWT) for most cargo ships; gross tonnage (GT) for passenger, ro-pax, ro-ro vehicle carriers, and cruise ships.