How the calculation works
Petrol CO2 = distance ÷ km per litre × CO2 per litre. EV CO2 = distance ÷ 100 × kWh per 100 km × grid CO2 per kWh.
Frequently asked questions
Where do I find my grid’s CO2 figure?
Your national grid operator or energy agency publishes an average in kg per kWh.
Does it include making the car?
No. It covers driving only.