EV vs Petrol Calculator

EV vs Petrol Calculator — measure your ev vs petrol impact. Evidence-based formula with reduction tips.

The EV vs Petrol Total Cost Calculator models the five-year (or ten-year) total cost of ownership for an electric vehicle versus a comparable petrol car, factoring in purchase price, fuel/electricity costs, insurance, servicing, and road tax. A year-by-year cumulative cost chart shows exactly when (or if) the EV breaks even with the petrol alternative. Use Loan Payment Calculator to plan for the upfront purchase, or Mortgage Calculator to factor EV savings into your broader financial planning.

According to the IEA Global EV Outlook 2024, global EV sales reached 14 million in 2023 — 18% of all cars sold. The UK average electricity price in 2024 is approximately 24p/kWh for home charging, while average petrol is around 150p/litre. EV servicing costs are approximately 40% lower than petrol equivalents (AA data, 2023) due to fewer moving parts — no oil changes, exhaust systems, or timing belts. UK EVs were exempt from Vehicle Excise Duty (road tax) until 2025, when a flat-rate VED of £195/year was introduced. The OZEV plug-in car grant of up to £2,500 was discontinued for cars in 2022, though grants remain for vans, motorcycles, and charge point installation.

Select your region (🇬🇧 UK, 🇺🇸 US, 🇪🇺 EU) to load default prices — adjust any value to match your specific situation.
Enter the EV and petrol car purchase prices, including any grants or incentives already applied.
Set electricity and fuel prices from your local supplier or petrol station prices.
Fill in annual insurance, servicing, and road tax for each vehicle type — the defaults are realistic UK averages.
Choose the comparison period (3, 5, 7, or 10 years) and read the break-even year and total cost comparison.

Total cost of ownership formula

Annual EV running cost = (Annual mileage ÷ Miles per kWh × Electricity price) + Insurance + Servicing + Road tax

Total cost over N years = Purchase price + (Annual running cost × N). The break-even year is where EV cumulative total equals petrol cumulative total.

Worked example: EV costs £40,000, petrol costs £25,000. EV running: (10,000 ÷ 3.5) × £0.24 + £1,200 + £200 + £0 = £686 + £1,400 = £2,086/yr. Petrol running: (10,000 ÷ 40 × 1.609 × £1.50) + £900 + £600 + £180 = £604 + £1,680 = £2,284/yr. EV saves £198/yr running costs; break-even = (£40k−£25k) ÷ £198 = 75 years — purchase price gap dominates here. A smaller gap (e.g., EV £30k vs petrol £25k, saving £1,200/yr running) breaks even in 4 years.

EV vs petrol: understanding the comparison

Break-even year and total cost of ownership

The break-even year is the key metric. If it's within 3–5 years and you intend to keep the car for 7+ years, the EV is the financially rational choice. If break-even exceeds 10 years, the EV premium may not be recovered over a typical ownership period unless you place high value on the environmental benefits or EV driving experience.

The annual running cost comparison reveals the day-to-day economics. EVs typically save £600–1,200/year on fuel and £400/year on servicing in the UK, but these savings are offset by the higher upfront cost. High-mileage drivers (15,000+ miles/year) benefit disproportionately from EVs because fuel savings scale with usage while the purchase price difference is fixed.

Ecology tips and best practices

Home charging is 3–5× cheaper than public rapid charging — if you can charge at home, the economics of EV ownership improve dramatically.
Check for salary sacrifice schemes through your employer — EVs attract very low Benefit in Kind (BiK) tax of just 2% in 2024, making them extremely tax-efficient as company cars.
EV battery warranties are typically 8 years or 100,000 miles — factor this into your ownership period when comparing long-term costs.
Consider second-hand EVs: used EV prices fell significantly in 2023–24, making the upfront cost premium much smaller versus comparable used petrol cars.
A home EV charger (OLEV-approved) qualifies for the EV chargepoint grant: up to £350 off installation costs for eligible properties. [OZEV]
For high-mileage motorists: the fuel saving is proportional to miles driven — at 20,000 miles/year, the EV saving doubles compared to 10,000 miles/year.

Global EV sales in 2023: 14 million, representing 18% of all cars sold — up from 14% in 2022. [IEA Global EV Outlook 2024]
UK average home electricity price: 24p/kWh (2024). Average petrol: ~150p/litre. [Ofgem / RAC]
EV servicing costs approximately 40% lower than petrol vehicles over 3 years. [AA EV ownership survey, 2023]
UK EV VED (road tax) for 2025 onwards: £195/year flat rate, up from £0. Petrol cars: £180–£595/year based on CO₂ emissions. [DVLA]

Common mistakes to avoid

Using electricity unit rate without standing charge — your true cost per kWh should include the daily standing charge amortised over monthly usage.
Assuming EV insurance is comparable to petrol — EV premiums are still 10–15% higher on average due to higher repair costs and specialist parts. [ABI, 2023]
Forgetting depreciation — some EVs (particularly non-Tesla models) have depreciated faster than comparable petrol cars in 2023–24 as used EV supply surged.
Ignoring real-world range — manufacturer range figures assume ideal conditions; cold weather can reduce battery range by 20–30%, affecting charging stop planning.

EV incentives, VED rates, and grant programmes are set by government and OZEV/DVLA (UK), the DOE and IRS (US), and national transport ministries (EU). This calculator provides general information only and does not constitute financial, tax, or legal advice. Grant eligibility criteria and tax rules change frequently — verify current rules with the relevant authority before making a purchase decision.