Carbon accounting for logistics and transportation from data you already have

Last updated July 2026. Transportation and logistics companies face emissions requests from every direction: California SB 253 pulls in companies over $1 billion in revenue doing business in the state, large shippers push carbon questionnaires down to the carriers and 3PLs they hire, and customers reporting their own Scope 3 need transported-goods data from you. A logistics business already generates most of the data an inventory needs. Fuel-card statements, fleet fuel invoices, utility bills for warehouses and terminals, and the accounts payable file that lists every subcontracted carrier and freight lane are the raw inputs, and our carbon accounting software classifies them into a scope-by-scope inventory with the evidence attached.

A carrier's footprint splits across the three scopes in a way that decides where the data comes from. Scope 1 is the diesel and gasoline burned in owned and controlled vehicles: line-haul trucks, delivery vans, yard trucks, plus reefer-unit fuel and any on-site generators. Scope 2 is the purchased electricity for warehouses, terminals, cross-docks and offices. Scope 3 is everything else, and for an asset-light 3PL or a broker, purchased transportation, the freight you subcontract to other carriers, is usually the single largest source, dwarfing your own fleet fuel.

The purchased-transportation line is the one logistics firms underestimate. For a broker or asset-light 3PL, the freight you subcontract can be most of the footprint, so a coarse spend-based screen over your Scope 3 reporting tells you whether to invest in tonne-kilometer data for those lanes before you spend a quarter on it. The full procedure, with the EPA factors, is in our guide to calculating Scope 3 from spend.

Freight emissions are calculated by multiplying the activity, tonne-kilometers (weight times distance), by an emission factor for the mode and vehicle type. A 10-tonne load carried 500 kilometers by truck is 5,000 tonne-kilometers; multiply by the truck factor to get the emissions. Where you lack shipment detail, screen with spend-based factors on carrier invoices first, then move your largest lanes to the activity method. The GLEC framework and the GHG Protocol both point to this tonne-kilometer approach as the defensible way to report transported-goods emissions.

More and more do. A US transportation or logistics firm over $1 billion in revenue that does business in California must report Scope 1 and Scope 2 under SB 253, with a first deadline of November 10, 2026 and Scope 3 following in 2027. Below that threshold, the request usually comes from your customers: large shippers need transported-goods emissions for their own Scope 3, so they push carbon questionnaires onto the carriers and 3PLs they hire. Either way the deliverable is a defensible Scope 1, 2 and 3 number with evidence behind it, which is why building the inventory from your own fuel and freight records now pays off whichever request lands first.

For related sectors, see carbon accounting for manufacturing, carbon accounting for construction, food and beverage and technology and SaaS. For the vendor landscape, see best carbon accounting software. If your reporting trigger is specifically California, SB 253 reporting software covers that regime in full.