The honest answer is: it depends almost entirely on your tariff. Charging is priced per kWh, so the cost of a full charge is roughly your usable battery size multiplied by your unit rate.
On a dedicated overnight EV off-peak rate, home charging is the cheapest energy most households buy. On the standard price-cap rate it costs several times more per mile, and public rapid charging can cost around ten times the off-peak rate for the same energy.
We don't quote a single headline figure here because it would be wrong for most people. Open any car page and enter your annual mileage and charging situation — the physics model computes your actual monthly cost, and shows the 2028 pay-per-mile road tax impact too. Every figure is explained on the methodology page.