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EV Home Charging Cost Calculator
Work out what a home charge actually costs you — per charge, per mile, and per year — and see how that stacks up against what you'd have paid at the pump. Runs entirely in your browser, nothing is uploaded.
Enter a petrol car's mpg and fuel price above to see how much you're saving versus filling up.
Who this is for
Anyone with an EV (or thinking about getting one) who wants a straight answer on what a home charge actually costs, rather than a vague "it's cheaper than petrol" line. Useful for budgeting a charge, comparing tariffs, or working out whether switching to an off-peak EV tariff is worth it.
Why does my electricity price matter so much?
Because unlike petrol, where the pump price is roughly the same everywhere, home electricity prices vary a lot by tariff. A standard variable rate under the current Ofgem price cap (Jul–Sep 2026) averages around 26p/kWh, while a dedicated off-peak EV tariff charging overnight can be as low as 7–9p/kWh. That difference alone can more than triple your cost per mile, so it's worth checking whether your supplier offers an EV or off-peak tariff before assuming a fixed cost.
How accurate is the petrol comparison?
It's an honest estimate based on the mpg and fuel price you enter, converted using the exact UK gallon (4.54609 litres). Real-world mpg and pump prices both vary — by car, by driving style, by region, and week to week — so treat the saving as a useful ballpark rather than an exact figure.
Does this include public charging?
No — this calculator is for home charging only. Public rapid and ultra-rapid chargers are usually priced per kWh at a much higher rate than home electricity, sometimes close to or above petrol cost per mile, so the savings shown here mostly apply to charging at home or overnight.
What efficiency figure should I use?
3.5 miles per kWh is a reasonable average default, but real efficiency depends on the car, weather, speed and driving style — cold weather and motorway driving both reduce it. If you know your car's actual figure (many EVs show this on the dashboard), use that instead for a more accurate result.
Please note: this tool gives a guide or estimate only. It may not be 100% accurate and is not professional advice — always check the figures before you rely on them. Everything you type stays in your browser — nothing is uploaded, saved or sent anywhere.
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