How to use this calculator
- Enter or choose number of vehicles.
- Enter or choose distance per vehicle per year.
- Enter or choose average fuel consumption.
- Enter or choose emission factor.
- Enter or choose average payload carried.
- The fleet emissions per year updates as you type. Use Copy result or Share to keep it.
Method
Fuel = Vehicles × km × L/100 km ÷ 100; CO₂e = Fuel × Factor; g/km = L/100 km ÷ 100 × Factor × 1000; g/tkm = g/km ÷ Payload
- Factor
- kg CO₂e emitted per litre of fuel burned
- Payload
- average tonnes carried per km, including empty running
Worked example
- Fuel = 10 × 100,000 × 30 ÷ 100 = 300,000 L.
- Emissions = 300,000 × 2.6 = 780,000 kg = 780 t CO₂e (78 t per truck).
- Per km = 0.30 L × 2.6 = 0.78 kg = 780 g; per tonne-km = 780 ÷ 12 = 65 g.
Ten trucks running 100,000 km a year at 30 L/100 km emit about 780 t CO₂e with a 2.6 kg/L factor.
What the result means
Tonne-km intensity lets you compare routes and vehicle types fairly. Reducing empty running raises the average payload and lowers g/tkm even if total fuel is unchanged.
Assumptions and limits
- Every vehicle has the same distance and consumption; for a mixed fleet, run each vehicle class separately and add the results.
- The result is only as accurate as the emission factor; factors differ by fuel blend, country and whether they include upstream (well-to-tank) emissions.
- Refrigerant leakage and reefer-unit fuel are not included unless added to the consumption.
Questions
Where do I get an emission factor?
Use the factor set your reporting framework requires, such as your national government’s published greenhouse-gas conversion factors. Check whether it is tank-to-wheel or well-to-wheel.
Should I use fuel or distance data?
Fuel purchase records are more accurate than distance × average consumption. If you have total litres, enter 100 km per vehicle and set consumption to litres per vehicle.