CII calculator › Ro-ro passenger ship
Ro-ro passenger ship CII calculator
Work out the attained and required Carbon Intensity Indicator (CII) of a ro-ro passenger ship and its A–E rating for any year from 2023 to 2030. Capacity for this ship type is gross tonnage (GT), so the CII is in grams of CO₂ per GT·nautical mile.
Required CII by ship size, 2023–2030
Required CII in g CO₂/(GT·nm) for example sizes. The required value tightens each year by the reduction factor Z.
| GT | 2023 | 2024 | 2025 | 2026 | 2027 | 2028 | 2029 | 2030 |
|---|---|---|---|---|---|---|---|---|
| Z | 5% | 7% | 9% | 11% | 13.625% | 16.25% | 18.875% | 21.5% |
| 10,000 | 27.78 | 27.19 | 26.61 | 26.02 | 25.26 | 24.49 | 23.72 | 22.95 |
| 30,000 | 16.76 | 16.41 | 16.05 | 15.70 | 15.24 | 14.77 | 14.31 | 13.85 |
| 60,000 | 12.18 | 11.93 | 11.67 | 11.41 | 11.08 | 10.74 | 10.40 | 10.07 |
Reference line
The 2019 reference value is a × Capacity−c with these parameters from IMO resolution MEPC.353(78), Table 1:
| Size | Capacity used | a | c |
|---|---|---|---|
| All sizes | GT | 2023 | 0.46 |
Rating boundaries
Each boundary is the required CII multiplied by a factor from MEPC.354(78), Table 1. A ship is rated A up to the superior boundary, B up to the lower, C up to the upper, D up to the inferior, and E above it.
| Size | Superior (A|B) | Lower (B|C) | Upper (C|D) | Inferior (D|E) |
|---|---|---|---|---|
| All sizes | 0.76 | 0.92 | 1.14 | 1.30 |
See how the CII is calculated.