EV Charging Cost Calculator
Enter the charge you normally add, your car's efficiency and the electricity rate you pay. The result shows the cost per charge, per mile and per year.
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Then edit the two figures below to match your own car.
Use the usable capacity stated for your car.
Your car's trip computer shows this.
Use your off-peak rate if you charge overnight.
Starts at 10%. Change it if you have a figure for your car and charger.
38.7 kWh from the meter
34.8 kWh into the battery. Add your unit rate above to see the cost.
Use the energy you pay for
Your car reports the energy stored in its battery, while your meter records the energy drawn from the wall. Use the charging-loss field to account for that difference. For public charging priced at the charger, set the loss to zero unless the network says otherwise.
Use the rate that applies
Enter the unit rate charged during the session. If charging crosses peak and off-peak periods, calculate each part separately. The price cap page can help you check standard capped rates, but your own tariff is the right figure to use.
Check the result
Replace the preset battery size and efficiency with figures for your car. The annual estimate holds the rate and efficiency constant, so rerun it when either changes.
Frequently asked questions
How much does it cost to charge an electric car at home in the UK?
Enter your usable battery capacity, starting and finishing charge, charging loss and the unit rate you pay. The calculator works out the energy billed at the meter and the cost of the charge.
Why is the calculator’s kWh figure higher than my car’s?
Your car reports energy reaching the battery, while your meter records energy drawn from the wall. Charging loses some energy, so the meter figure is usually higher.
What is a realistic miles per kWh figure?
Use your car’s long-term trip-computer figure if you have it. The preset values are editable examples, not averages for every vehicle of that type.
Should I use my standard rate or an off-peak EV rate?
Use the rate that applies while the car is charging. If a charge crosses peak and off-peak periods, calculate each part separately.
Does the annual figure account for future price changes?
No. It uses the rate you enter for all twelve months, so recalculate if your tariff or driving changes.
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