EV charging cost · Tesla calculator · UK
EV charging cost calculator UK
Enter your battery size, start and target charge, then compare the same session at home, on an EV tariff or at a public charger. Get £/charge, grid kWh and p/mile before reading any guide.
One charge · instant answer
Calculate this charge
Use your usable battery capacity and the price you actually pay. Presets are shortcuts, not whole-home tariff recommendations.
Battery
Electricity price
30p home, 8p off-peak and 60p public are illustrative inputs, not current supplier offers or live Tesla prices. Enter the VAT-inclusive unit rate from your bill or the selected station in the Tesla app. Loss is the percentage of grid energy not stored in the battery.
Estimate your annual home-charging cost
Use annual mileage and your own tariff rates to compare charging-energy scenarios over a year.
2. Enter your tariff rates
Use the actual unit rates you pay, including VAT. This calculator isolates EV charging energy. It does not include standing charges or the rest of your home's electricity use.
All starting rates are editable illustrations, not current supplier quotes. Use VAT-inclusive rates from your own tariff. Savings compare charging energy only; standing charges and the rest of your household use may change the whole-home result.
Tesla Supercharger cost calculator UK
Use the first calculator for a charging session. Enter usable battery capacity, the starting and target charge percentages, your loss assumption and the actual p/kWh price. Tesla prices vary by station and time; the example public price is not a live quote.
A 75 kWh usable battery charged from 20% to 80% gains 45 kWh. With 10% of incoming energy lost, grid energy is 45 ÷ 0.90 = 50 kWh. At an illustrative 30p/kWh this costs £15; at 60p/kWh it costs £30. Actual charging losses vary.
Charging cost per mile and per year
Charging cost = grid kWh × price in p/kWh ÷ 100. Range added uses battery kWh × miles/kWh. Pence per mile divides session cost by that range; it is an energy estimate, not the full cost of owning the car.
The annual calculator uses miles × Wh/mile ÷ 1,000 ÷ (1 − loss fraction) × home-charging share. At 8,000 miles, 280 Wh/mile, 10% loss and 80% home charging, home energy is about 1,991 kWh a year. At 30p/kWh it costs about £597; at 8p/kWh about £159. The remaining public-charging energy is excluded from that annual home total.
Home charging versus public charging
At home, use the rate for the hours when the vehicle charges. Public rates may depend on network, time, membership or payment method. Add membership, parking and congestion or idle fees separately. A low overnight unit rate alone does not prove a tariff is cheapest for your whole home.
Read Tesla Supercharger prices UK and the UK home-charging guide. For real session records, see Tesla charging history.
Charging energy is separate from road tax
This tool calculates electricity costs. It does not calculate VED, any mileage-based vehicle tax, company-car BIK, insurance or depreciation.
Frequently asked questions
Does this work for electric cars other than Tesla?
Yes. Enter your electric car’s usable battery capacity and efficiency. The energy-cost formulas are not specific to Tesla.
Are the Supercharger prices live?
No. Enter the current price for your chosen site from the Tesla app or vehicle. Starting prices are illustrative, and additional fees are excluded.
How are charging losses calculated?
The loss percentage is the share of incoming grid electricity not stored in the battery. At 10% loss, 45 kWh added to the battery requires 50 kWh from the grid.
Is this an electric car pay-per-mile tax calculator?
No. Pence per mile here means charging energy cost per mile. Vehicle taxes and company-car tax are separate.
Sources and assumptions
Tesla UK Supercharging guidance, checked 12 October 2026. Prices and loss assumptions are entered by the user; results are estimates rather than supplier quotes.
Choose the right UK calculator
Electric company car tax / BIK calculator · HMRC mileage claim calculator · EV charging cost calculator UK
Tesla charging cost per month: worked examples and price assumptions
Quick answer: add the cost of each charging source, not just the kWh
Your Tesla charging cost per month is the sum of what you paid to charge at home, at Superchargers and at other paid charging locations during that month. The simple version is:
For the best result, calculate each charging session using the price that actually applied to that session instead of multiplying all monthly kWh by one average rate.
That distinction matters because the same Tesla can be charged at £0.08/kWh overnight at home, at a much higher daytime home tariff, at a Supercharger with time-dependent pricing and at a third-party public charger with its own tariff or session fee. One blended rate can hide where the money went.
Tesla's own Charge Stats already gives owners a useful view of energy charged and estimated spending. Tesla lets you switch the graph between Total Charged and Total Spent, set custom Home, Work and Other rates, and model time-of-use periods. DriveQuery's goal is not to pretend that this does not exist. The useful extra layer is keeping a month tied to the individual charging sessions and price assumptions that produced it.
How to calculate Tesla charging cost per month
If every charge happened at one flat electricity rate, the calculation is easy:
Example: 250 kWh × £0.25/kWh = £62.50.
Real months are usually more complicated. A better calculation works session by session:
- Record the energy for each charge. Keep the kWh associated with the session or billing record.
- Identify where it happened. Home, work, Tesla Supercharger or another public network can all have different pricing.
- Apply the right price. For home charging, that might depend on time of day. For paid public charging, use the actual session price or invoice when available.
- Add any session-specific fees. Public charging can include fees that are not explained by kWh alone.
- Sum the sessions for the month. Keep the underlying entries so the total remains auditable.
A worked monthly example
Imagine a Tesla driver with a cheap overnight home tariff, a small amount of peak-rate home charging and two types of public charging. The figures below are illustrative — they are not current market prices.
| Charging source | Energy / basis | Example cost |
|---|---|---|
| Home — off-peak | 210 kWh × £0.08 | £16.80 |
| Home — peak | 18 kWh × £0.32 | £5.76 |
| Tesla Supercharging | Final session/invoice totals | £28.40 |
| Other public charging | Provider session totals | £14.20 |
| Month | 228 kWh home + paid public charging | £65.16 |
The interesting part is not only the £65.16. You can also see that most energy was charged cheaply at home, while a relatively small amount of public charging made up a large share of the bill. That is the kind of pattern a monthly total should reveal.
Home charging: the tariff matters as much as the kWh
Home charging is often where a monthly estimate becomes misleading. If your electricity contract has one flat price, multiplying kWh by that price may be enough for a practical estimate. With a time-of-use or dynamic tariff, when the car charged matters.
Tesla's Charge Stats supports time-of-use home rates and can show how much Home charging energy falls into off-peak, mid-peak and peak periods. That is a useful reminder that 200 kWh charged at night is not economically equivalent to the same 200 kWh charged during an expensive period.
Flat tariff
Use the applicable all-in per-kWh rate if it genuinely represents what another kWh of charging costs you.
Time-of-use tariff
Split charging by tariff period. Do not price every session at the month's cheapest rate simply because most charging happened overnight.
Dynamic tariff
The relevant price can change every hour or quarter-hour depending on the market and contract. Session timing becomes part of the cost calculation.
Solar / home battery
“Free solar” can be useful shorthand, but the economic cost may depend on export value, battery cycling and your own accounting method. Keep the assumption explicit.
If you want to reduce this part of the bill rather than merely report it, see the Tesla smart charging guide and dynamic-tariff charging app guide.
Supercharging: use the final charge, not a guessed average
Tesla publishes Supercharger pricing by site and, in supported markets, by time period. Tesla also says the price for a session is determined by the plug-in time and does not change mid-session if the displayed price changes.
For monthly reporting, the cleanest approach is to use the actual Supercharging transaction or invoice rather than multiplying Supercharger kWh by a generic “average Supercharger rate”. Tesla lets owners view charging history and download Supercharging invoices from the app.
Also keep non-energy fees separate when they occur. Tesla's current support material describes congestion fees at busy sites. A cost tracker that only stores kWh × rate can miss fees that were actually billed.
Why the kWh in your car may not match the kWh on your electricity bill
One of the easiest mistakes in EV cost calculations is assuming that every kWh drawn from the wall becomes one kWh stored in the battery. Charging has conversion losses and the car can use energy for battery conditioning and other systems while connected.
That means two valid measurements can describe different points in the system:
- Vehicle energy added is useful for understanding what reached the car/battery.
- Wall or meter energy is closer to what the household electricity supplier actually billed.
If you need invoice-level home charging reimbursement, a certified charger or electricity meter may be the correct source depending on the employer, country and policy. If you want a practical ownership-cost view, vehicle charging data can still be very useful — just make the measurement basis clear.