Tesla Supercharger Cost Calculator
Where you plug in matters more than what you drive. Set your mix of overnight EV-tariff charging, standard-rate home charging, Supercharging and free charging to see your monthly bill, cost per mile — and whether Tesla's Supercharging membership would pay for itself.
Monthly cost
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Cost per mile
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Per year
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Best → worst
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best → worst per month
Where the money goes
Four charging strategies
per month, your ratesBreakdown by source
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Not on an EV tariff yet? Most UK suppliers now offer EV tariffs with around six cheap overnight hours at roughly 7–9p/kWh — a fraction of the ~26p capped rate. Schedule charging in the car (or let your supplier's smart charging handle it) so it falls inside the cheap window, and push your off-peak share towards 100%. A home battery can also store cheap overnight or solar energy for the evening peak — see the Powerwall Payback tool.
How this is calculated
- Energy = miles per month × consumption (Wh/mi) ÷ 1,000. That energy is split by your mix; if the sliders don't add to 100% we scale them proportionally.
- Home charging is billed at the meter, so home kWh are increased by the loss percentage (≈8–12% from a 7 kW wallbox) before multiplying by your off-peak or peak/standard rate.
- Supercharging is billed per kWh delivered. Your effective rate = list price × (1 − off-peak share × off-peak discount), then × (1 − membership discount) if you have one, plus the monthly fee. Some sites bill per minute instead — prices vary by site and time of day.
- Best case assumes every mile is charged at home off-peak on an EV tariff; worst case assumes every mile is Supercharged at your effective non-member rate.
Is Supercharging still cheaper than petrol?
Usually, but not by as much as home charging. At £0.52/kWh and 255 Wh/mi, Supercharging costs about 13p a mile — roughly the same as a 47-mpg petrol car at 137p/L. Home charging on an EV tariff at 7.5p is closer to 2p a mile. Compare with the Petrol Savings tool.
What counts as "free" charging?
Workplace chargers, hotel or destination chargers, and any free-Supercharging credits you still have. We count the energy but not the cost.
Does charging at home all the time hurt the battery?
No — slower AC charging is the gentlest kind. Frequent DC fast charging is fine for most owners but generates more heat. Use the charge limit your car recommends for daily driving.