How much does it cost to charge your electric car — and how long will it take?
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Charging cost = energy put into the battery ÷ charging efficiency × price per kWh. About 10% is lost as heat, more on a slow socket.
Charging time depends on the charger and the car's limit; rapid chargers slow down above about 80%. Charging at home on an off-peak tariff is usually far cheaper per mile than petrol.
| Battery size | 75 kWh |
| Charge from | 20% |
| Charge to | 80% |
| Charger power | 7.4 kW |
| Electricity price per kWh | 0.25 |
| Efficiency | 3.5 |
| Efficiency unit | miles per kWh |
| Charging losses | 10% |
| Petrol cost per mile to compare (optional) | 0 |
| Currency | $ Dollar |
| Charging cost | $12.50 |
| Charging time | 6 h 45 min |
| Energy added to battery | 45 kWh (50 kWh from the grid) |
| Range added | 158 miles (253 km) |
| Cost per mile | $0.079 ($0.049 per km) |
$12.50, 6 h 45 min.
| Battery size | 60 kWh |
| Charge from | 10% |
| Charge to | 80% |
| Charger power | 50 kW |
| Electricity price per kWh | 0.79 |
| Efficiency | 3.5 |
| Efficiency unit | miles per kWh |
| Charging losses | 10% |
| Petrol cost per mile to compare (optional) | 0 |
| Currency | £ Pound |
| Charging cost | £36.87 |
| Charging time | 0 h 56 min |
| Energy added to battery | 42 kWh (46.7 kWh from the grid) |
| Range added | 147 miles (237 km) |
| Cost per mile | £0.251 (£0.156 per km) |
£36.87.
A 60 kWh car from 20% to 80% uses about 40 kWh from the grid — around $10 at $0.25/kWh.
Roughly 6–8 hours on a 7 kW home wallbox for a typical 20–80% charge, or 20–40 minutes on a 150 kW rapid charger.
Charging slows above 80% and many makers recommend 80% for daily use to protect the battery.
At home usually yes — often a third to half the cost per mile; rapid public charging can be close to petrol prices.