Car CO₂ Emissions Calculator (L/100 km to g/km and Yearly CO₂)
Grams of CO₂ per kilometre from fuel consumption, the CO₂ of a year's driving, and the consumption that a CO₂ figure on a car label implies.
Results
The dashed line marks the value you entered.
What this tool does
Burning a litre of fuel turns its carbon into CO₂ in a fixed amount, so emissions are proportional to consumption: about 2.3 kg per litre of petrol and 2.7 kg per litre of diesel for pure mineral fuel, a little less for blends containing biofuel. A car using 6.5 L/100 km of petrol therefore emits about 150 g/km. Type approval figures are measured on a test cycle, so real-world consumption and CO₂ are usually higher. Enter the emission factor of your fuel; it is not the same for electricity.
Formula
CO₂ (g/km) = L/100 km × kg CO₂ per litre × 10 · per year = L/100 km ÷ 100 × km × kg per litre · L/100 km = g/km ÷ (10 × kg per litre)
Variables
| Symbol | Meaning | Unit |
|---|---|---|
fc | Fuel consumption | L/100 km |
ef | CO₂ per litre of fuel burned | kg/L |
km | Kilometres per year | km |
gk | CO₂ on the label | g/km |
GK | CO₂ per kilometre | g/km |
KY | CO₂ per year | kg |
K1 | CO₂ per 100 km | kg |
LH | Consumption that matches the label figure | L/100 km |
Worked example
- Fuel consumption6.5 L/100 km
- CO₂ per litre of fuel burned2.31 kg/L
- Kilometres per year12,000 km
- CO₂ on the label120 g/km
- CO₂ per kilometre150 g/km
- CO₂ per year1802 kg
- CO₂ per 100 km15.0 kg
- Consumption that matches the label figure5.19 L/100 km
Limitations
- The default values are typical reference figures, not measurements of your situation. Replace them with your own data whenever you have it.
- The result is an estimate based only on the values you type. Real situations often include factors this calculator does not know about.