CII calculator › Tanker
Tanker CII calculator
Work out the attained and required Carbon Intensity Indicator (CII) of a tanker 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 | 18.10 | 17.72 | 17.34 | 16.96 | 16.46 | 15.95 | 15.45 | 14.95 |
| 50,000 | 6.78 | 6.64 | 6.50 | 6.35 | 6.16 | 5.98 | 5.79 | 5.60 |
| 115,000 | 4.08 | 3.99 | 3.91 | 3.82 | 3.71 | 3.60 | 3.48 | 3.37 |
| 160,000 | 3.34 | 3.26 | 3.19 | 3.12 | 3.03 | 2.94 | 2.85 | 2.76 |
| 300,000 | 2.27 | 2.23 | 2.18 | 2.13 | 2.07 | 2.00 | 1.94 | 1.88 |
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 | 5247 | 0.61 |
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 | 0.82 | 0.93 | 1.08 | 1.28 |
See how the CII is calculated.