EV Charging Cost Calculator
Cost, time and range of charging an electric car at home or a public charger.
About this tool
Enter the battery size, the charge level to start and stop at, the electricity price, charging efficiency, charger power and your car's efficiency, or pick a preset such as a home wallbox or a rapid charger. The calculator shows the cost of the charge, the energy added and drawn from the grid, the charging time, the range added, the cost per 100 km or miles and the cost of a full charge.
How to work out the cost of charging an EV
Charging cost is the energy added to the battery, divided by the charging efficiency, multiplied by the price per kWh. Taking a 75 kWh battery from 20% to 80% adds 45 kWh. At about 88% efficiency the charger draws roughly 51 kWh, which costs about 14.30 at 0.28 per kWh. Losses come from heat, the car's onboard charger and keeping the battery at the right temperature, and are usually 10โ15% on a home wallbox and higher on a slow 3-pin plug. Charging time is energy divided by charger power, limited by what your car can accept. Rapid chargers slow sharply above about 80%, which is why many drivers stop there on trips. The biggest saving usually comes from your tariff: off-peak overnight rates for EVs can be half the standard price or less, while public rapid chargers can cost two or three times as much as home. Honest limits: real efficiency drops in cold weather and at motorway speeds. The EV vs petrol calculator compares running costs, the electricity cost calculator prices other appliances and the fuel cost calculator prices petrol trips. Which appliances actually use the most electricity puts EV charging in context.
Frequently asked questions
How much does it cost to charge an electric car at home?
Energy added รท efficiency ร price. Adding 45 kWh at 88% efficiency and 0.28 per kWh costs about 14.30.
How long does it take to charge an EV?
Energy needed รท charger power. 51 kWh on a 7.4 kW wallbox takes about 7 hours; a rapid charger can do it in under an hour.
Why charge to 80% instead of 100%?
Rapid charging slows down a lot above about 80%, and many makers recommend 80% for daily use to look after the battery.
Is my data saved?
No. The calculation runs in your browser and nothing is stored or sent.