Charging at home is usually the cheapest way to run an EV, but public chargers are unavoidable on long trips. See exactly what each public top-up costs compared with plugging in at home.
How the calculation works
Energy per charge = battery size x (end % minus start %) / 100. Home cost is energy times the home rate and public cost is energy times the public rate. The extra cost per charge is the difference, multiplied by your monthly public charges, and by 12 for the yearly figure.
Worked example
Charging a 40 kWh battery from 20% to 80% adds 24 kWh. At ₹8 per kWh at home that is ₹192. At ₹18 per kWh on a public charger it is ₹432, so each public charge costs ₹240 more. Four a month adds up to ₹960 a month.
Frequently asked questions
Why are public chargers dearer?
Operators recover equipment, land, power-demand and platform costs, and DC fast chargers are expensive to run.
Does the calculator include idle fees?
No. Some networks add parking or idle fees, so add them separately.
Does it include charging losses?
No. Both costs use the energy added to the battery, so real bills are slightly higher in both cases with a similar gap.
These calculators give estimates based on the numbers you enter. Real results vary with vehicle, tariff, weather and driving habits.