EV Charging Cost Calculator
Your monthly charging cost is the electricity your miles use, split between your home tariff and public charging prices. Enter your mileage, efficiency, prices and home-charging share to see the monthly, annual and per-mile cost.
Your Charging Costs
Electricity for driving only. Charging losses, standing charges and charger installation are not included.
Enter your charging details and press Calculate.
How the charging cost is calculated
Electricity used
Monthly mileage ÷ EV efficiency (miles per kWh).Home charging
Electricity used × home share (%) × home rate (p/kWh), in pounds.Public charging
Electricity used × the remaining share × public rate (p/kWh), in pounds.Monthly and annual cost
Home + public charging per month; the annual cost is the monthly cost × 12.Cost per mile
Monthly cost ÷ monthly mileage × 100, in pence to one decimal place.
Worked example
800 miles a month in an EV that does 4 miles per kWh, charging 80% at home at 7.5p/kWh and the rest at 65p/kWh.
- Monthly Charging Cost
- £38.00
- Annual Charging Cost
- £456
- Cost Per Mile
- 4.8p
800 ÷ 4 = 200 kWh a month. Home: 160 kWh × 7.5p = £12.00. Public: 40 kWh × 65p = £26.00. Total £38.00 a month, £456 a year. £38.00 ÷ 800 miles = 4.8p a mile.
Assumptions and limits
- The home-charging share must be between 0 and 100%. Everything not charged at home is priced at the public rate.
- Charging losses are not included, so the electricity drawn from the supply will be a little higher than the energy the car uses.
- Standing charges, subscriptions and the cost of installing a home charger are not included.
- You enter the electricity prices; the calculator does not use live tariffs.
Key Takeaways
- Your home-charging share matters most when public charging costs much more per kWh than your home tariff.
- In the worked example, moving from 80% to 100% home charging would cut the monthly cost from £38.00 to £15.00.
- The figures exclude charging losses and standing charges, so treat them as the electricity cost of driving.