Electric vehicle charging cost calculator

Enter usable battery capacity, the starting and target charge percentages, your electricity price and charging losses. Use a loss estimate relevant to the charger and conditions. The result is especially useful for comparing home and public energy rates for the same charge.

Formula

Battery energy added = capacity × (target percentage − starting percentage) ÷ 100. Grid energy = battery energy ÷ (1 − loss percentage ÷ 100). Charging cost = grid energy × price per kWh.

Worked example

Charging a 60 kWh usable battery from 20% to 80% adds 36 kWh. If 10% of electricity drawn is lost, the grid supplies 36 ÷ 0.9 = 40 kWh. Apply your tariff to those 40 kWh.

What the result means

Grid energy is the amount relevant when electricity is billed at the charging point. Battery energy is the amount added to storage; the difference represents the selected charging losses.

Electricity price · India

₹8.00/kWh is an illustrative input, not an India-wide average or an official electricity tariff. Replace it with the applicable rate for your state, DISCOM, consumer category and consumption slab.

Last reviewed: 9 September 2026

Electricity duty, fuel or power purchase adjustments, fixed charges and subsidies depend on the applicable state and DISCOM rules. No national tax percentage or subsidy is assumed. Slab thresholds, sanctioned-load charges and time-of-day tariffs are not automatically modelled.

Assumptions and limits

Battery condition, temperature, preconditioning and charger efficiency can change actual consumption. Session fees, parking charges, subscriptions and time-based charging are not included.

Questions answered

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