EV Charging Cost Calculator

EV Charging Cost Calculator works out what charging an electric car, scooter or bike costs and how long it takes. Enter the battery’s usable capacity in kWh (from the specifications), the charge level you start from and charge to, and the rate you pay per unit — your home electricity tariff, or the price per kWh shown by a public charger. Charging loses some energy as heat in the charger, cables and battery, so more is drawn from the supply than reaches the battery: the efficiency is set to 88% and you can change it. It gives the units drawn and their cost, the energy stored, and the time on your charger’s power. Add the car’s energy use per kilometre from its trip computer and it also shows the cost per kilometre — usually a fraction of petrol’s — and the range that charge gives.

1. Enter the usable battery capacity.
2. Enter the charge you start from and charge to.
3. Enter your rate per unit and check the efficiency.
4. Add the charger’s power and the car’s use for time and cost per km.

• The time is approximate: charging slows above about 80%, most of all on DC fast chargers.
• Home tariffs are often in slabs; use the rate of the slab your charging falls in, or your bill’s average.
• Some public chargers bill by time or add a session fee; add that separately.
• Everything is worked out in your browser. Nothing is sent anywhere.

A 30 kWh battery from 20% to 80% stores 18 kWh; at 88% efficiency that is about 20.5 units, ₹164 at ₹8 a unit.

A 3 kWh scooter battery from empty to full takes about 3.4 units from the socket.

Chargers and batteries lose some energy as heat — usually 10–15% on a home charger.

About units drawn ÷ 7.2 hours: roughly 3 hours for 20 units, a little longer near full.