HomeCalculatorsEEDI Attained - Energy Efficiency Design Index

EEDI Attained - Energy Efficiency Design Index

Compute a new ship's attained EEDI per MEPC.328(76), the required EEDI for its type and phase, and the compliance margin. Design-phase metric for carbon efficiency per tonne-mile.

IMODesignMEPC.328(76)

Ship

Ship typeShip capacityDWTDeadweight - used as the capacity denominator for most cargo ships per MEPC.328(76) Table 1.Reference speedknVref - the ship's speed in knots (kn) at 75 % MCR on design draft, calm water.

Main engines

One row per main engine. Power is 75 % of each engine's MCR; SFC is taken from the engine's NOx Technical File at the 75 %-load point.

Power at 75 % MCRkWFuelSpecific fuel consumptiong/kWh

Auxiliary engines

Combined power of all auxiliary engines per MEPC.231(65) §2.5.6. Include shaft generators here if driven from the main engine.

Total auxiliary powerkWFuelSpecific fuel consumptiong/kWh

Regulatory phase & credits

EEDI phasePhase 3 applies to most newbuilds contracted on or after 1 April 2022.Phase reduction factor%Called Z in MEPC.328(76). The default updates when you change ship type or phase; override it if you have a more specific figure from the size-band table.Innovative-technology creditg CO₂ / hCategory A / B / C credit per MEPC.1/Circ.815 subtracted from the numerator. Leave blank if none.

Attained EEDI

3.700gCO₂ / t·nm

4.25 t CO₂/h at 75 % MCR.

Required EEDI

3.050gCO₂ / t·nm

Reference × (1 − 30%)

Compliance margin

-21.3%

Ship is 21.3 % above required - NON-compliant.

Formula, assumptions, and limits

The EEDI formula from MEPC.328(76), simplified for the single-ME / single-fuel / no-shaft-generator case this calculator covers in v1:

P_ME,i - 75 % of MCR of each main engine (kW).
Cf - fuel-to-CO₂ conversion factor per MEPC.364(79) (built in).
SFC - specific fuel consumption of the engine (g/kWh) at the reference load.
P_AE - auxiliary-engine power per MEPC.231(65) §2.5.6 table.
Capacity - deadweight (cargo ships) or gross tonnage (passenger/cruise) per MEPC.328(76) Table 1.
V_ref - reference speed at 75 % MCR on design draft (knots).

Required EEDI = reference × (1 − Z), where the reference is a × Capacity^−c from MEPC.328(76) Table 1 and Z is the phase reduction factor (5–50 % depending on ship type, size band, and contract date).

Compliance margin = (Required − Attained) / Required × 100 %. Positive means the ship is better than required (compliant); negative means over the limit (non-compliant).

Not modelled in v1: PTI/shaft-generator terms, waste-heat recovery credit explicit accounting, fⱼ (ice class), fᵢ (cargo factor), f_w (weather), f_c (cubic capacity), f_m (ship-specific). These land in Phase 1B.