HomeCalculatorsEEOI - Energy Efficiency Operational Indicator

EEOI - Energy Efficiency Operational Indicator

Cargo-work-based CO₂ intensity per MEPC.1/Circ.684 - grams CO₂ per tonne-mile of cargo actually carried. The oldest of the IMO operational intensity metrics.

IMOOperationalMEPC.1/Circ.684

Cargo work (summed over all voyages)

Cargo workt·nmΣ (mass carried × distance) across every laden voyage in the reporting period. Ballast legs don't contribute cargo work; they still contribute CO₂ below.

Fuel consumption (all voyages, laden + ballast)

FuelMass burnedt

EEOI

7.785gCO₂ / (t·nm)

Total 7.8 kt CO₂.

Formula, assumptions, and limits

EEOI = Σⱼ (Fⱼ × Cfⱼ × 10⁶) / Σᵢ (mᵢ × Dᵢ)

Fⱼ - mass of fuel j burned over the reporting period.
Cfⱼ - MEPC.364(79) CO₂ conversion factor.
mᵢ × Dᵢ - cargo mass carried on voyage i × distance of voyage i.

EEOI is useful where the ship-type capacity basis (DWT for AER, GT for cgDIST) doesn't reflect actual utilisation - e.g. a bulker running half-empty vs full. Ballast legs hurt EEOI since they burn fuel without contributing cargo work.