AER - Attained vs Required
Attained AER (Annual Efficiency Ratio) vs required benchmark - precursor metric to CII.
Attained AER
5.36gCO₂/dwt·nm
Vs reference
27.6%
Formula, assumptions, and limits
AER is the deadweight-based carbon intensity. CII uses same formula but with reference line and A-E bands. Some charterers use AER directly in commercial terms.
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| Fuel type i consumption | t | IMO DCS | |
| Fuel CO₂ factor | tCO₂/tfuel | MEPC.364(79) |