EV Charging Cost Calculator
Estimate your electric vehicle charging costs at home or on the road, compare with petrol, and project annual savings.
Charging Session Breakdown
EV vs Petrol Running Cost Comparison
EV Charging Cost Calculator UK 2025/26
Our EV Charging Cost Calculator helps UK drivers estimate how much it costs to charge an electric vehicle at home or at public charging points. Enter your battery size, electricity tariff, and driving habits to see your cost per charge, cost per mile, and potential savings compared to a petrol car. Whether you drive a Tesla Model 3, Nissan Leaf, or VW ID.3, this tool gives you accurate, real-world cost estimates for 2025.
How Much Does It Cost to Charge an Electric Car in the UK?
The cost of charging an EV depends on three main factors: your battery capacity, your electricity unit rate (pence per kWh), and how much charge you need. As of 2025, the average UK domestic electricity rate is approximately 24.5p per kWh on a standard variable tariff. However, off-peak tariffs like Octopus Go can offer rates as low as 7.5p per kWh, dramatically reducing charging costs.
| Charging Method | Typical Rate (p/kWh) | Full Charge (60 kWh battery) |
|---|---|---|
| Home (Standard SVT) | ~24.5p | £14.70 |
| Home (Off-peak / Octopus Go) | ~7.5p | £4.50 |
| Public slow charger | ~30p | £18.00 |
| Rapid public charger | ~55p | £33.00 |
| Ultra-rapid motorway | ~79p | £47.40 |
How to Use the EV Charging Cost Calculator
- Enter your battery capacity in kWh, or pick a vehicle from our quick presets (Tesla Model 3, Nissan Leaf, VW ID.3, and more).
- Set your current and target charge levels using the sliders. For example, 20% to 80% represents a typical partial charge.
- Enter your electricity unit rate in pence per kWh, or select a common UK tariff preset.
- Add your vehicle efficiency in miles per kWh. Most EVs achieve 3.0 to 4.5 mi/kWh depending on model and conditions.
- Optionally enter your annual mileage and petrol car details to see a full annual savings comparison.
- Click Calculate for instant results.
EV vs Petrol: Which Is Cheaper to Run?
Electric vehicles are significantly cheaper to run than petrol or diesel cars in almost every scenario. A typical EV costing 7p per mile to run (home charging on an off-peak tariff) compared to a petrol car at 15p per mile (40 mpg at 145p/litre) saves roughly 8p per mile. Over 8,000 miles per year, that adds up to annual fuel savings of around £640. Even on a standard tariff at 24.5p/kWh, an EV still costs less per mile than most petrol cars.
Factors That Affect Your EV Charging Costs
- Electricity tariff: Off-peak tariffs (Economy 7, Octopus Go, Octopus Agile) can cut costs by 60-70% compared to standard rates.
- Charging efficiency loss: Around 10% of electricity is lost as heat during AC-to-DC conversion. Our calculator accounts for this by default.
- Driving efficiency: Cold weather, motorway speeds, and heating use can reduce mi/kWh by 20-30% in winter.
- Battery size: Larger batteries cost more to fully charge but provide more range per session.
- Charging speed: Rapid and ultra-rapid DC chargers are convenient but typically cost 2-3 times more than home charging.
Average UK EV Charging Costs by Tariff (2025)
| Tariff / Location | Rate (p/kWh) | Cost Per Mile* | Annual Cost (8,000 mi)* |
|---|---|---|---|
| Octopus Go (off-peak) | 7.5p | 2.4p | £192 |
| Octopus Agile (avg) | 9.0p | 2.9p | £232 |
| Economy 7 (night) | 15.0p | 4.8p | £384 |
| Standard SVT | 24.5p | 7.8p | £624 |
| Rapid public charger | 55.0p | 17.5p | £1,400 |
| Petrol comparison (42 mpg) | 145p/L | 15.7p | £1,256 |
*Based on 3.5 mi/kWh efficiency and 10% charging loss. Annual cost excludes standing charges.
Tips to Reduce Your EV Charging Costs
- Switch to a specialist EV tariff like Octopus Go or Intelligent Octopus for off-peak rates as low as 7.5p/kWh.
- Charge overnight whenever possible to take advantage of lower off-peak rates.
- Avoid frequent use of rapid public chargers except on long journeys; home charging is typically 3-5 times cheaper.
- Keep your battery between 20% and 80% for daily driving to prolong battery health and reduce per-session costs.
- Use preconditioning while plugged in at home so the car draws power from the grid rather than the battery.
- Consider solar panels with a home battery to charge your EV effectively for free during summer months.
Frequently Asked Questions
How much does it cost to charge an EV at home in the UK?
Charging a typical 60 kWh EV battery from 20% to 80% at home on a standard tariff (24.5p/kWh) costs approximately £9.74, accounting for a 10% charging efficiency loss. On an off-peak tariff like Octopus Go (7.5p/kWh), the same charge would cost only about £2.98.
Is it cheaper to charge an EV at home or at a public charger?
Home charging is almost always cheaper. Standard home rates (24.5p/kWh) are roughly half the cost of rapid public chargers (55-79p/kWh). Off-peak home tariffs can be up to 90% cheaper than motorway ultra-rapid charging.
How much does it cost to charge a Tesla Model 3 in the UK?
A Tesla Model 3 with a 60 kWh battery costs approximately £16.33 for a full charge on a standard tariff (24.5p/kWh), or about £5.00 on an off-peak tariff like Octopus Go (7.5p/kWh). With a real-world efficiency of around 4.0 mi/kWh, that works out to roughly 6.8p per mile on a standard tariff or 2.1p per mile on off-peak.
How much money do you save with an electric car compared to petrol?
A typical EV driver covering 8,000 miles per year on a standard tariff (24.5p/kWh) spends around £624 on electricity, compared to approximately £1,256 for a 42 mpg petrol car at 145p/litre. That is an annual saving of roughly £632. With an off-peak tariff, annual savings can exceed £1,000.
What is the cheapest electricity tariff for EV charging?
As of 2025, Octopus Go offers off-peak rates of approximately 7.5p/kWh for 4 hours overnight, making it one of the cheapest EV charging tariffs in the UK. Octopus Intelligent and OVO Drive are also competitive. Always compare tariffs on a whole-house basis, as some EV tariffs have higher daytime rates.
Do I need a special charger at home for an electric car?
While you can use a standard 3-pin plug ( granny charger ), it is very slow at around 2.3 kW. A dedicated home charge point (7.4 kW) is recommended and typically charges 3 times faster. Government grants of up to £350 are available for flat owners and renters through the EV Chargepoint Grant scheme.
How long does it take to charge an electric car?
Charging time depends on battery size and charger power. A 60 kWh battery on a 7.4 kW home charger takes approximately 8 hours for a full charge. A 50 kW rapid charger can add 100+ miles of range in about 30-45 minutes. Ultra-rapid 150 kW+ chargers can charge compatible vehicles to 80% in 20-30 minutes.
Does cold weather affect EV charging costs?
Cold weather reduces EV efficiency by 20-30% due to battery chemistry, increased heating use, and tyre resistance. This means you may need to charge more frequently or for longer, increasing costs. Pre-conditioning your car while plugged in at home helps offset this by warming the battery using grid power rather than battery power.
What is charging efficiency loss and why does it matter?
When electricity flows from the grid into your EV battery, approximately 10% is lost as heat during AC-to-DC conversion and cable resistance. This means you draw more energy from the wall than actually enters your battery. Our calculator includes a 10% default efficiency loss, which you can adjust based on your setup.
Are EV charging costs tax-deductible for business use?
If you use your electric vehicle for business purposes, you can claim the electricity cost as a business expense. For company car drivers, the Advisory Electricity Rate is 7p per mile (as of 2025). Self-employed individuals can claim actual electricity costs or use simplified mileage rates. Consult HMRC guidance or a tax adviser for your specific situation, and use our Self Assessment Tax Calculator for broader tax planning.