CII calculator › Container ship
Container ship CII calculator
Work out the attained and required Carbon Intensity Indicator (CII) of a container ship and its A–E rating for any year from 2023 to 2030. Capacity for this ship type is deadweight tonnage (DWT), so the CII is in grams of CO₂ per DWT·nautical mile.
Required CII by ship size, 2023–2030
Required CII in g CO₂/(DWT·nm) for example sizes. The required value tightens each year by the reduction factor Z.
| DWT | 2023 | 2024 | 2025 | 2026 | 2027 | 2028 | 2029 | 2030 |
|---|---|---|---|---|---|---|---|---|
| Z | 5% | 7% | 9% | 11% | 13.625% | 16.25% | 18.875% | 21.5% |
| 10,000 | 20.86 | 20.42 | 19.98 | 19.54 | 18.96 | 18.39 | 17.81 | 17.24 |
| 30,000 | 12.19 | 11.93 | 11.68 | 11.42 | 11.08 | 10.75 | 10.41 | 10.07 |
| 65,000 | 8.35 | 8.18 | 8.00 | 7.82 | 7.59 | 7.36 | 7.13 | 6.90 |
| 120,000 | 6.19 | 6.06 | 5.93 | 5.80 | 5.63 | 5.46 | 5.28 | 5.11 |
| 200,000 | 4.82 | 4.72 | 4.62 | 4.52 | 4.38 | 4.25 | 4.12 | 3.98 |
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 | DWT | 1984 | 0.489 |
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 | 0.83 | 0.94 | 1.07 | 1.19 |
See how the CII is calculated.