CO₂ Emissions Calculator

Convert fuel consumption into CO₂ emissions (g/km) by fuel type.

How it works

1

Enter consumption

In L/100km or MPG (US/UK).

2

Pick the fuel

Each fuel emits a different amount of CO₂ per litre burned.

3

Read g/km

We multiply litres-per-km by the fuel's CO₂ factor.

Frequently asked questions

How is CO2 per km calculated?

CO₂ (g/km) = litres per km x the fuel's CO₂ factor x 1000. Petrol emits about 2.31 kg CO₂ per litre, diesel about 2.68 kg/L. Diesel emits more per litre but often uses fewer litres.

Why does diesel emit more per litre but sometimes less per km?

Diesel is denser and more carbon-rich (2.68 vs 2.31 kg/L), yet diesels are usually more efficient, so g/km can still be lower despite the higher per-litre figure.

Does tuning change CO2?

Emissions hardware (DPF/EGR/SCR) exists to cut pollutants; CO₂ itself tracks fuel burned. Tampering with emissions controls is illegal for road use in most countries.

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