Calculate car journey emissions from fuel consumption and occupancy.
Car emissions follow directly from fuel burned, since carbon content per litre is essentially fixed. Diesel produces more CO2 per litre but less fuel is burned per kilometre, which roughly cancels out. Occupancy is the largest lever available: four people in one car emit a quarter each of the same journey driven alone.
Car Travel Carbon Footprint
Emissions = fuel used × kilograms of CO2 per litre
Emissions = fuel used × kilograms of CO2 per litre Car emissions follow directly from fuel burned, since carbon content per litre is essentially fixed. Diesel produces more CO2 per litre but less fuel is burned per kilometre, which roughly cancels out.
Occupancy is the largest lever available: four people in one car emit a quarter each of the same journey driven alone.
This calculator takes 5 inputs: Distance, Fuel consumption, Fuel type, Occupants, Offset price per tonne. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.