Ship Carbon Intensity Indicator (CII) Calculator

EEDI (Energy Efficiency Design Index) is a design standard for new ships built after 2013, requiring a minimum energy efficiency level per capacity-mile.

EEXI (Energy Efficiency Existing Ship Index) is the design standard for existing ships (built before 2013 or not subject to EEDI). Both indexes calculate the theoretical design efficiency based on installed power, speed, capacity, and fuel factors.

EEXI (Energy Efficiency Existing Ship Index) is a one-time technical measure introduced by the IMO under MARPOL Annex VI to evaluate the design energy efficiency of existing ships over 400 GT. It requires existing vessels to meet a specific baseline efficiency comparable to newer EEDI-compliant vessels.

EEXI is a design/technical index calculated once. It measures how the ship is built (its theoretical efficiency).

CII (Carbon Intensity Indicator) is an operational measure calculated annually based on actual fuel consumed and distance sailed. It measures how the ship is operated in practice.

EEXI is calculated by dividing the CO₂ emissions from the vessel's propulsion and auxiliary systems by the product of the ship's capacity (DWT or GT) and its reference speed:

EEXI = (CO₂ Emissions from Main + Aux Engines) / (Capacity × Reference Speed)
This represents the theoretical grams of CO₂ emitted per capacity-mile under reference load conditions.

EEDI (Energy Efficiency Design Index) is a design index for new ships (theoretical efficiency under standard conditions).

EEOI (Energy Efficiency Operational Indicator) is an operational monitoring tool that measures actual CO₂ emissions per actual cargo carried per nautical mile during real voyages. EEOI uses actual cargo weight, whereas EEDI (and CII) uses maximum ship capacity (DWT/GT).

In shipping and logistics, EDI (Electronic Data Interchange) comprises four core components:

1. Standard Document Format: Standardized document layouts (e.g., UN/EDIFACT or ANSI X12) that replace paper.
2. Translation Software: Converts internal database applications into standard EDI formats for transmission.
3. Transmission / Communication Network: Protocols and routes used to send documents (like SFTP, AS2, or Value-Added Networks).
4. Trading Partners: The organizations (e.g., shippers, carriers, ports) exchanging the data.

(Note: In ship design contexts, EEDI calculation components focus on engine power, specific fuel consumption, carbon factor, and capacity/speed.)

The Carbon Intensity Indicator (CII) is an operational rating system introduced by the IMO under MARPOL Annex VI. It rates ships (5,000 GT and above) annually on a scale from A (major superior) to E (inferior) based on their actual operational carbon emissions per transport capacity and distance.

Operational carbon intensity is measured by dividing the ship's annual CO₂ emissions (calculated from actual fuel consumed multiplied by fuel-specific conversion factors) by its annual transport work (vessel capacity in DWT or GT multiplied by total distance sailed in nautical miles).

Percent concentration is measured in parts per hundred. Since 1% is equal to 10,000 parts per million (ppm), a concentration of 3% CO₂ is equal to 30,000 ppm.

Under the IMO CII framework, a "good" rating is an A or B rating (major or minor superior energy efficiency performance). A rating of C is acceptable (moderate). Ratings of D (for three consecutive years) or E require corrective action plans in the vessel's SEEMP.

The management and compliance of a ship's Carbon Intensity Indicator (CII) are structured around the 4 pillars of the SEEMP (Ship Energy Efficiency Management Plan):

1. Planning: Establishing baselines, target CII ratings, and detailed operational measures to meet target guidelines.
2. Implementation / Operation: Putting planned actions (e.g., speed optimization, route planning, trim optimization) into daily practice.
3. Monitoring & Reporting: Collecting daily fuel consumption and voyage data under the IMO Data Collection System (DCS).
4. Self-Evaluation & Corrective Action: Auditing annual results and developing corrective plans if the vessel falls below a 'C' rating.

These are standard Incoterms (International Commercial Terms) defining who pays for and bears the risk of shipping goods:

- FOB (Free on Board): The seller delivers goods on board the buyer's nominated vessel. The buyer bears all costs and risks from the loading port to destination.
- C&F / CFR (Cost and Freight): The seller pays for transport/freight to the destination port, but risks transfer to the buyer once the goods are loaded.
- CIF (Cost, Insurance, and Freight): The same as C&F, but the seller must also pay for marine insurance to protect the goods during transit.