How we calculate
Sea distance is a rough route between the two ports along major sea lanes (straits, the Suez and Panama canals and the great capes). Road and rail add a margin to the great-circle distance, and air allows for take-off and landing.
Emissions are distance (km) × cargo (tonnes) × emission factor (g CO₂e per tonne-km). The factors are typical averages used for planning in the industry.
Reading the results
The tool shows the difference between modes. Real emissions depend on vessel size, load factor, fuel and routing. For a carbon report you will share with customers or auditors, use the carrier's official data.
