Car Carbon Footprint Calculator
By Santaji GadepatilinUpdated October 27, 2026
L/100 km
calculated
calculated
g/km
calculatedType in any field to change it. Press × on a value to calculate that field instead.
How to use this calculator
Choose the fuel, then enter your yearly distance and fuel consumption. Fuel used, total CO₂ and grams of CO₂ per km are calculated.
Formulas
Fuel = distance × consumption ÷ 100
CO₂ = fuel × emission factor
Example
12,000 km a year at 7 L/100 km (petrol):
- Fuel = 840 L
- CO₂ = 840 × 2.31 = 1.94 t
- About 162 g CO₂/km
Factors are for fuel combustion only; the full life cycle (fuel production, car manufacture) adds more.
Frequently asked questions
How much CO₂ does a litre of petrol produce?
Burning one litre of petrol releases about 2.3 kg of CO₂; diesel about 2.7 kg. This calculator covers tailpipe emissions only.
What is a typical car's footprint?
A car using 7 L/100 km for 12,000 km a year emits about 1.9 tonnes of CO₂.
How can I reduce it?
Drive less, combine trips, keep tyres inflated, drive smoothly, and choose a more efficient or electric vehicle.