CII calculator › Gas carrier
Gas carrier CII calculator
Work out the attained and required Carbon Intensity Indicator (CII) of a gas carrier 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% |
| 5,000 | 33.33 | 32.62 | 31.92 | 31.22 | 30.30 | 29.38 | 28.46 | 27.54 |
| 20,000 | 13.74 | 13.45 | 13.16 | 12.87 | 12.49 | 12.12 | 11.74 | 11.36 |
| 55,000 | 7.20 | 7.05 | 6.90 | 6.75 | 6.55 | 6.35 | 6.15 | 5.95 |
| 80,000 | 9.59 | 9.39 | 9.19 | 8.99 | 8.72 | 8.46 | 8.19 | 7.93 |
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 |
|---|---|---|---|
| Less than 65,000 DWT | DWT | 8104 | 0.639 |
| 65,000 DWT and above | DWT | 1.4405E11 | 2.071 |
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) |
|---|---|---|---|---|
| Less than 65,000 DWT | 0.85 | 0.95 | 1.06 | 1.25 |
| 65,000 DWT and above | 0.81 | 0.91 | 1.12 | 1.44 |
See how the CII is calculated.