EV Fuel Savings Calculator (EV vs petrol)

The calculator computes the annual fuel cost of a petrol car and the annual EV energy cost, then subtracts the EV cost from the petrol cost. Petrol cost = mileage/100 * consumption * fuel price, EV cost = mileage/100 * energy use * electricity price. The difference is the saving.

Yes. If you charge mainly at expensive fast-charging stations while fuel is cheap, the EV energy cost can exceed the fuel cost — then the saving is negative. Drivers charging at home on a cheaper night tariff benefit the most.

Typical EV use is 15-22 kWh/100 km, depending on the model, weight, driving style and temperature. Small city EVs around 14-16 kWh, larger SUVs even 22-25 kWh. In winter use rises due to cabin heating. The value 17 kWh is a reasonable average.

Home charging usually costs 0.6-1.2 per kWh, cheaper on a night tariff. Fast DC chargers on the road cost 2-3 per kWh or more. This difference strongly affects EV economics. Charging at home gives the biggest savings; station charging reduces them.

No. It compares the drive cost only — fuel versus energy. Electric cars usually have lower servicing costs but differ in purchase price, insurance and battery depreciation. A full ownership cost comparison requires accounting for those elements.

In winter energy use rises by 20-40% due to cabin heating, lower battery efficiency and higher resistance. This raises the cost per km and shortens range. In summer use is lower. For a realistic picture, enter energy use averaged over the whole year.

Most often yes, especially with home charging and high mileage, but not always. High electricity prices, frequent expensive station charging or low fuel prices can reduce or reverse the EV advantage. The calculator lets you check your individual case.

The higher the mileage, the faster the lower energy cost offsets the higher EV purchase price. At 20,000-30,000 km a year the savings are significant. At very low mileage the saving is small. The calculator shows the annual energy saving itself.

The calculator uses default values as an example, but prices change dynamically. For a reliable result, enter current prices from your area and the real consumption of your car. The more accurate the inputs, the better the estimate of the saving.

No. It is informational and compares only fuel versus energy cost. A decision to buy an EV should consider the vehicle price, subsidies, insurance, servicing and charging infrastructure. Treat the result as one argument, not a complete account.