EEOI Tool Energy Efficiency Operational Indicator & Voyage Carbon Intensity

IMO EEOI • Voyage CO₂ Intensity • Transport Work • Fuel CF • Ballast Emissions • Multi-Voyage Period • Rolling Average • Fuel Mix • Target Sensitivity

EEOI Tool Energy Efficiency Operational Indicator & Voyage Carbon Intensity

Calculate operational CO₂ efficiency as emissions per unit of transport work using the IMO EEOI method. Simple mode handles one transport voyage with up to two fuels. Advanced supports transport, ballast and other zero-work legs, up to three fuels per row, official EEOI fuel conversion factors plus a custom factor, weighted period EEOI, rolling weighted EEOI, emissions-by-fuel analysis and fuel/work sensitivity without incorrectly averaging individual voyage EEOIs.

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Need ballast legs, multiple voyages or rolling performance? Click Advanced above.Advanced follows the period formula: total included CO₂ divided by total transport work. Ballast/zero-work legs can contribute fuel and CO₂ without adding transport work to the denominator.

Fast8 primary inputs

Core outputg CO₂ per unit-nm

ImportantEEOI is not the MARPOL CII rating

Single-Voyage EEOI

For a single transport voyage, enter total fuel consumed for the defined voyage at sea and in port. Use Advanced when the analysis needs explicit ballast/zero-cargo legs or multiple voyages.

Transport-work basis

Work amount carriedtonnes cargo.

Distance corresponding to worknautical miles.

Primary fuel type

Primary fuel consumedmetric tonnes.

Secondary fuel type

Secondary fuel consumedmetric tonnes; set fuel type to None if unused.

Internal / comparison target EEOIg CO₂ per tonne-nm. User-entered comparison only.

Period & Transport-Work Basis

Transport-work basis

Internal / comparison target EEOIg CO₂ per tonne-nm.

Rolling windowincluded rows used in weighted rolling EEOI.

Custom fuel CO₂ conversion factort-CO₂/t-fuel. Use only when “Custom fuel” is selected; verify the appropriate accounting basis.

Voyage / Period Register

Transport rows require positive work amount. Ballast and Other Zero-Work rows carry zero transport work but their fuel/CO₂ remains in the period numerator. Safety / SAR rows are excluded from both numerator and denominator in this screen.

Type	Work amount	Distance NM	Fuel 1	Fuel 1 t	Fuel 2	Fuel 2 t	Fuel 3	Fuel 3 t

Data Quality & Monitoring Readiness

Actual distance source verifiedDistance is based on actual sailed distance / consistent logbook data. Fuel quantities reconciledMain, auxiliary, boiler and other included consumption is consistently captured. Fuel types / CF values verifiedFuel classification and conversion factors use the chosen EEOI accounting basis. Transport-work basis consistentCargo/work units are not mixed across the period. Ballast / zero-work voyages includedOperational zero-work fuel is not silently removed from the period numerator. Excluded safety/SAR legs documentedAny exclusions have a clear operational basis. Period definition is consistentThe selected period/window is representative and applied consistently. Source records retainedCalculation inputs can be traced to relevant ship/company records.

Method boundary: EEOI is an operational CO₂/transport-work indicator under IMO’s voluntary EEOI guidance. It is not the IMO CII attained annual operational carbon-intensity rating and does not produce an A–E CII grade. The default fuel conversion factors are the carbon-content factors listed in MEPC.1/Circ.684; newer/alternative fuels can require a different verified factor or accounting framework. This tool reports tank-to-wake-style CO₂ from entered fuel mass × CF and does not calculate lifecycle/WtW GHG intensity.

IMO EEOI basis: MEPC.1/Circ.684 defines EEOI as CO₂ emitted per unit of transport work. Fuel consumption includes fuel used at sea and in port by main and auxiliary engines, boilers and incinerators for the defined voyage or period. Actual sailed distance in nautical miles is used. For a voyage, EEOI = Σ(FC × CF) ÷ (work amount × distance). For a period or number of voyages, Average EEOI = ΣΣ(FC × CF) ÷ Σ(work amount × distance), meaning it is not the arithmetic mean of voyage EEOIs. Ballast and other non-cargo operational voyages are included in period monitoring; safety/SAR voyages are excluded in this implementation in line with the guidance note.

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