EV Home Charging Cost Calculator UK & Ireland
Calculate the cost of a full charge or a 20–80% top-up at home, including charging losses. Enter your own VAT-inclusive electricity rate in GBP or EUR; the result separates energy stored in the battery from electricity bought at the meter. Choose a car to load catalogue specifications. Other starting values are editable examples; use the rates from your bill.
Your inputs
How much does a 20–80% EV charge cost?
Worked example: 60kWh usable battery, 20% to 80%, 90% charging efficiency. These are illustrative rates in the selected currency, not live tariffs or exchange-rate conversions. Standing charges are excluded.
| Unit rate | Grid electricity | 20–80% cost |
|---|---|---|
| €0.10/kWh | 40.0 kWh | €4.00 |
| €0.25/kWh | 40.0 kWh | €10.00 |
| €0.35/kWh | 40.0 kWh | €14.00 |
Frequently asked questions
How do I calculate EV charging cost per kWh?
Multiply electricity drawn from the grid by your unit rate. For a battery top-up, first divide the energy added by charging efficiency as a fraction. A 36kWh top-up at 90% efficiency buys 40kWh from the grid.
Do I enter pence or pounds per kWh?
Enter pounds per kWh for the UK and euros per kWh for Ireland: 25p or 25 cents is 0.25. The country selector chooses the local currency; it does not convert prices.
Does a 7kW charger cost more to run than a 3-pin charger?
Power mainly changes how long the session takes. With the same energy delivered, efficiency and unit rate, the model gives the same cost. Actual losses and the amount charged outside a cheap-rate window can change your bill.
Is this a public rapid-charging cost calculator?
It estimates energy charges using the rate you enter. It does not add parking, connection, idle or time-based fees, so it is designed for home charging rather than a complete public charging bill.
Guides for your charging decision
How this works
Energy added = usable battery capacity × (target − start) / 100. Grid electricity = energy added ÷ (efficiency / 100). Cost = grid electricity × your unit price. Standing charges are excluded because they are usually paid regardless of this charge.
Technical references
- US Department of Energy: charging power and vehicle limits
- Energy Saving Trust: time-of-use tariffs and negative prices
- NIST: exact distance conversion factors
Keep the assumptions in view
Use the usable battery capacity and AC rating from your vehicle documentation. Use electricity prices from your current bill. Estimates do not replace an electrical survey or a supplier quote.
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