EV Home Charging Tariff Calculator
Compare a single-rate electricity tariff against a cheap overnight EV tariff for charging your car at home, see the annual saving, and how it stacks up honestly against the petrol equivalent.
Estimate only. These are estimates based on the figures you enter, actual tariff rates, standing charges and driving patterns vary. This does not include electricity standing charges, or the cost of the vehicle itself.
Enter your driving and tariff details
Your annual charging cost on each tariff, the saving, and the petrol comparison appear here as you type.
How this comparison is worked out
Annual charging need (in kWh) is your annual mileage divided by your car's efficiency in miles per kWh. On a single-rate tariff, every kWh costs the same. On an EV off-peak tariff, the share of charging you do overnight is billed at the cheap off-peak rate, and the rest at the tariff's day rate, this calculator splits your annual kWh by the percentage you tell it is done off-peak, and totals the cost on each side. The petrol comparison applies the same mileage to a petrol car at your chosen fuel economy and pump price, using the same maths as the site's Fuel Cost Calculator, so you can see the full picture, not just the EV tariff saving, but how driving on electricity compares with driving on petrol at all.
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