Why does charging cost more than battery capacity × electricity rate?

Because of charging losses. Not all the electricity drawn from the wall ends up stored in the battery, some is lost as heat during AC-to-DC conversion. This calculator divides battery capacity by charging efficiency (e.g. 90%) before multiplying by the electricity rate, so a 50 kWh battery at 90% efficiency actually draws about 55.6 kWh from the grid.

How do I find my cost per km for an EV?

Divide the cost per full charge by the range per charge you entered. For example, ₹444.44 to fully charge a 300 km range EV works out to roughly ₹1.48 per km, useful for comparing directly against a petrol or diesel vehicle's fuel cost per km.

EV Charging Cost Calculator

Estimate the cost of charging an electric vehicle, accounting for charging losses.

How this is calculated

Cost = (Battery capacity ÷ Charging efficiency) × Electricity rate

Assumptions used in this calculation

Charging losses: Actual energy drawn from the grid is higher than the battery capacity due to charging losses.

About this calculator

The EV charging cost calculator estimates the cost of a full charge and cost per km for an electric vehicle, accounting for energy lost during charging.

Worked example

50 kWh battery, ₹8/kWh, 90% efficiency

Result: ₹444.44 per full charge

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About this calculator

Frequently asked questions

Why does charging cost more than battery capacity × electricity rate?

How do I find my cost per km for an EV?

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