Ro-ro cargo ship CII calculator
- Capacity
- GT
- Required CII 2026, 25,000 GT
- 12.89
- Reduction factor Z
- 5% → 21.5% in 2030
- A–E rating
- Yes
Work out the attained and required Carbon Intensity Indicator (CII) of a ro-ro cargo 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 | 21.45 | 21.00 | 20.55 | 20.10 | 19.51 | 18.91 | 18.32 | 17.73 |
| 25,000 | 13.76 | 13.47 | 13.18 | 12.89 | 12.51 | 12.13 | 11.75 | 11.37 |
| 50,000 | 9.83 | 9.62 | 9.42 | 9.21 | 8.94 | 8.67 | 8.39 | 8.12 |
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 | 1967 | 0.485 |
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 | 0.89 | 1.08 | 1.27 |
See how the CII is calculated.