EV vs petrol running cost calculator
See roughly how much you could save (or spend) on energy by switching to an electric car, based on your mileage, your current car's economy, and how you'd charge.
miles
mpg
Current fuel
How you'd charge the EV
You could save
£1,083/yr
on fuel vs energy
Petrol/diesel cost
£1,256/yr
15.7p/mile
EV charging cost
£173/yr
2.2p/mile
Assumptions & how this is worked out
- Fuel at £1.45/litre; EV efficiency 3.7 mi/kWh.
- Charging at 8.0p/kWh (off-peak home rate).
- Compares fuel against electricity only — it excludes road tax, servicing, and insurance differences.
- Assumes the EV is charged entirely at the selected rate.
- Figures are estimates to help you decide — not a quote or financial advice. Last reviewed 2026-06-13.
Want the full picture?
This calculator looks at one piece of the puzzle. Our free 2-minute quiz weighs up your charging, driving, and budget for an honest, personalised verdict — including whether to wait.