Ship CO₂ Emissions Calculator

Direct Combustion CO2 • Sea vs Port • Fuel Mix • Voyage Intensity • Annualization • Carbon Cost

Ship CO₂ Emissions Calculator

Estimate direct shipboard CO₂ from fuel consumption and an editable fuel-specific conversion factor. Simple mode derives voyage emissions from distance, speed and daily burn. Advanced uses actual sea and port fuel quantities by fuel, adds cargo transport-work intensity, annualization, carbon-cost exposure and scenario stress without confusing direct combustion CO₂ with lifecycle greenhouse-gas emissions.

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Need multiple fuels, laden/ballast transport work or emissions stress cases? Click Advanced above.Simple uses one editable fuel conversion factor and separates sea and port emissions.

Voyage Activity

Voyage distancenautical miles.

Average sea speedknots.

Sea fuel consumptionMT/day.

Port / idle timedays.

Port / idle consumptionMT/day.

Cargo carried (optional)tonnes, used only for gCO2/t-nm.

Fuel & Commercial Exposure

Fuel type

CO₂ conversion factortCO2 per MT fuel. Editable.

Similar voyages per year

Carbon price (optional)currency / tCO2.

Carbon-price exposureGeneric commercial exposure only.

Voyage Activity

Use the laden leg for cargo transport-work intensity. Ballast distance still contributes to voyage CO2 per nautical mile and voyage duration.

Laden distance

Laden speed

Ballast distance

Ballast speed

Port / waiting days

Cargo carriedtonnes over the laden leg.

Actual Fuel Consumption by Fuel

Enter actual or planned sea and port fuel quantities. Default factors remain editable so documentary or supplier-supported values can be used where appropriate.

Use	Fuel	Sea MT	Port MT	CF tCO₂/MT

Annualization & Carbon Exposure

Similar voyages per year

Carbon price

Carbon-price exposure

Emissions Data Readiness

Fuel quantities verifiedMass consumed comes from the vessel's appropriate measurement / reporting basis. Fuel factors documentedDefault or custom CF values match the intended reporting / planning basis. Sea / port split reviewedOperational location split is consistent with the intended analysis. Distance basis verifiedLaden and ballast distance inputs match the voyage basis. Cargo basis verifiedCargo mass and laden transport distance are suitable for the optional intensity metric. Carbon-price scope reviewedEntered carbon cost is a commercial planning assumption, not an automatic ETS scope calculation.

Advanced Stress Cases

Stress direct CO2 and intensity without changing the recorded base case.

Case type	Fuel use %	Distance %	Cargo %	Carbon price %

Boundary: this calculator estimates direct combustion CO₂. It does not automatically add methane slip, nitrous oxide, upstream production, fuel transport or other well-to-wake emissions. It is not a substitute for IMO DCS, CII, EU MRV, EU ETS, FuelEU Maritime or another verified compliance calculation.

By the ShipUniverse Editorial Team — About Us | Contact