How Does This Freight Emissions Calculator Calculate Estimates?
This freight carbon emissions calculator uses the following average emission factors from Guidelines for Measuring and Managing CO2 Emission from Freight Transport Operations, published by the EU-aligned European Chemical Industry Council (Cefic):
- 602 gCO2 /tonne-km for air freight
- 8.4 gCO2 /tonne-km for ocean freight
- 50 gCO2 /tonne-km for truck freight
These are the best modal factors for providing reasonable estimates. Other variables such as craft type, load onboard, and even weather attributes like temperature and wind, play a much smaller role in determining actual shipment emissions.
Freight emissions for the port-to-port leg are calculated by multiplying the leg’s distance by the air or ocean emission factor (according to port type).
If the origin is an address, the freight carbon emissions calculator multiplies pickup leg distance by the truck emission factor and combined the subtotal with the port-to-port leg. A similar calculation happens if the destination is an address.
For door to door shipments (where the origin and destination are both addresses), the calculator combines the pickup, main transit, and delivery subtotals, and provides two total emission estimates (main transit by air and by sea).