What is the Car Trip Carbon Footprint Calculator?
This tool estimates the carbon dioxide (CO₂) produced by driving a car a given distance. It works from how far you travel, how efficiently your car uses fuel, and how much CO₂ each litre of that fuel releases when burned. Sharing a ride splits the footprint across passengers, showing the real per-person impact of a journey.
How to use it
Enter the trip distance in kilometres and your car's fuel economy in kilometres per litre. Pick the fuel type — gasoline, diesel or LPG — which sets the emission factor. Finally, enter how many people are travelling so the calculator can divide the total emissions per passenger. The result shows total kilograms of CO₂, litres of fuel burned, the per-passenger share and grams of CO₂ per kilometre.
The formula explained
The amount of fuel used is the distance divided by fuel economy. Burning that fuel releases CO₂ at a fixed rate: roughly 2.31 kg per litre of gasoline, 2.68 kg for diesel and 1.51 kg for LPG. So total emissions equal distance ÷ fuel economy × emission factor. These factors come from the carbon content of each fuel and are widely used by environmental agencies.
$$\text{CO}_2\text{ per person} = \frac{\dfrac{\text{Distance (km)}}{\text{Economy (km/L)}} \times \text{Emission Factor (kg/L)}}{\text{Passengers}}$$
Worked example
Drive 100 km in a car doing 12 km per litre of gasoline: fuel used = \(100 \div 12 = 8.33\) litres. CO₂ = \(8.33 \times 2.31 = 19.25\) kg. With two passengers, each person is responsible for about 9.63 kg of CO₂, and the trip averages roughly 192.5 g of CO₂ per kilometre.
FAQ
Does this include manufacturing or electricity? No — it covers only tailpipe CO₂ from burning fuel during the trip, not vehicle production or upstream fuel processing.
What about electric cars? EVs have no tailpipe emissions, so this tool targets combustion vehicles. EV footprints depend on the electricity grid mix.
Why split by passengers? Carpooling shares the same emissions among more people, dramatically lowering each person's individual footprint per trip.
