Freight CO₂ Emission Calculator
Estimate the carbon footprint of a shipment across road, rail, sea and air in seconds. Enter origin, destination and weight — compare modes and ship smarter.
Estimated transport emissions
Compare modes — the lowest-emission option is highlighted.
How the numbers are calculated
The calculator uses the established tonne-kilometre method for transport emissions. Factors are on a Well-to-Wheel (WTW) basis and draw on the GLEC Framework v3.2 and DEFRA 2026.
Emissions (kg CO₂e) = (weight ÷ 1000) × distance (km) × emission factor (g/tonne-km)
| Transport mode | Factor (g CO₂e/tonne-km) | Distance basis |
|---|---|---|
| Road (articulated) | 86 | Real road distance via Google |
| Rail | 28 | Great-circle × 1.10 |
| Sea | 16 | Great-circle × 1.15 |
| Air | 900 | Great-circle × 1.09 |
- All factors are Well-to-Wheel (WTW) and CO₂e (CO₂ + CH₄ + N₂O).
- Empty running and average load factor are already included in the published default factors.
- The air factor includes a radiative forcing multiplier (RF ×1.9) for high-altitude impact.
- Results are Tier-1 estimates; actual carrier-specific values may vary by ±30%.
How much does transport mode change emissions?
Say you move 10 tonnes over 1,000 km. The mode you choose can change the resulting carbon by more than tenfold. The table below compares the same shipment across all four modes.
| Mode | Estimated emissions | vs. road |
|---|---|---|
| Road (articulated) | 860 kg CO₂e | — |
| Rail | 280 kg CO₂e | ×0.33 |
| Sea | 160 kg CO₂e | ×0.19 |
| Air | 9,000 kg CO₂e | ×10.47 |
The spread shows that in green logistics the largest single gain usually comes not from renewing vehicles but from shifting mode. Every shipment that can move by rail or sea instead of road can cut emissions to a third or less in one step.
What is the tonne-kilometre method?
Transport emissions are calculated not from fuel burnt but from the weight carried multiplied by the distance travelled. That unit is the tonne-kilometre (tkm): moving 10 tonnes over 100 km equals 1,000 tkm. Because emission factors are published in grams of CO₂e per tkm, multiplying the two gives the shipment's carbon footprint. The method's advantage is that when one vehicle carries freight for several customers, emissions can be allocated fairly by weight.
What do ISO 14083 and the GLEC Framework standardise?
ISO 14083:2023 is the international standard defining how emissions across a transport chain are quantified and reported. The GLEC Framework is the logistics sector's implementation guide for that standard and publishes default emission factors per mode. Using both matters: the standard tells you how to calculate, the framework tells you with which factor. When a customer or auditor asks for an emissions report, you are expected to state which standard and which factor version you used.
Well-to-Wheel versus Tank-to-Wheel
Tank-to-Wheel (TTW) counts only what leaves the vehicle's exhaust. Well-to-Wheel (WTW) also includes the emissions created while producing, refining and transporting the fuel. ISO 14083 works on a WTW basis, and this calculator uses WTW factors. Because the two bases differ noticeably, take care to check which one was used when placing a TTW-based report next to a WTW one.
CBAM and customer demands: why this matters now
With the European Union's Carbon Border Adjustment Mechanism (CBAM), exporters to the EU are being asked for data on the embedded carbon of their goods. In parallel, large buyers now request shipment-level emission reports from their suppliers. That has turned carbon accounting from an environmental preference into a commercial requirement. If your shipment data already lives in one system, reporting adds no extra workload; if it is scattered across spreadsheets, every request becomes its own project.
Practical ways to cut transport emissions
The fastest way to reduce emissions is to make every tonne travel fewer kilometres. Raising load factor, cutting empty running and shortening routes all feed straight into emissions — and all three lower cost at the same time. Optimising the loading plan by volume and weight distribution, closing empty kilometres with return loads, and shifting suitable shipments from road to rail are the steps most fleets should try before replacing vehicles.
Frequently asked questions
How the calculator works and which standards it follows.
We use the standard tonne-kilometre method: emissions = (weight in tonnes) × distance × emission factor. Factors follow the GLEC Framework v3.2 / DEFRA 2026 on a Well-to-Wheel (WTW) basis.
Road distance is the real driving distance from Google Maps. Sea, rail and air use great-circle distance with mode-specific routing factors.
They are Tier-1 estimates using published default factors and are intended for guidance. Actual carrier-specific emissions may differ by ±30%.
Yes. The air factor includes a radiative forcing multiplier (DEFRA approach), reflecting the additional high-altitude climate impact of aviation.
Turn insight into lower emissions
Loggerise helps you plan loads, cut empty runs and track your fleet — reducing both cost and carbon. Start free.