EV Charging Cost Calculator
Enter your battery size, current and target charge level, and electricity rate — see instantly how many kWh you add and what it costs. Add efficiency (Wh/km) to also get approximate range gained.
Last updated: May 2026
Enter battery capacity, start/target %, and electricity rate above.
kWh added = battery × (target% − start%) ÷ 100 · cost = kWh × rate
How the EV charging cost calculator works
The calculator uses three straightforward formulas. You always need battery capacity, start charge, target charge, and electricity rate. Consumption (Wh/km) is optional — add it to see how much range the charge session adds.
Formula reference
| What you get | Formula | Example |
|---|---|---|
| kWh added | battery (kWh) × (target% − start%) ÷ 100 | 77 kWh × 60% ÷ 100 = 46.2 kWh |
| Total cost | kWh added × rate (€/kWh) | 46.2 kWh × €0.30 = €13.86 |
| Range added | kWh added × 1000 ÷ consumption (Wh/km) | 46.2 × 1000 ÷ 170 = 272 km |
Typical use cases
- Before a road trip — know exactly what you'll spend at a public fast charger
- Comparing home overnight charging cost vs a public session
- Estimating monthly charging spend based on how many kWh you add per week
- Checking whether a partial charge (e.g. 20% → 80%) gives you enough range for the next leg
- Budgeting for a DC fast charge stop when the per-kWh rate is high
Frequently Asked Questions
How do you calculate the cost to charge an electric car?
Multiply energy added (kWh) by your electricity rate. Energy added = battery capacity × (target % - start %) / 100. For a 60 kWh battery charged from 20% to 80%, that is 36 kWh. At a €0.28/kWh home tariff, cost = 36 × 0.28 = €10.08. At a public DC fast charger at €0.65/kWh, the same session costs €23.40. Enter your values above for an instant result.
How many kWh does it take to fully charge an electric car?
The kWh needed equals usable battery capacity minus energy already stored. A 60 kWh battery at 15% charge needs about 51 kWh to reach 100%. Common usable capacities: Nissan Leaf 40 kWh, VW ID.3 58 kWh, Tesla Model 3 57.5 to 82 kWh, Tesla Model Y 75 to 82 kWh. Enter your battery size and start percentage above to calculate exact energy and estimated cost.
Is it cheaper to charge an EV at home than at a public charger?
Yes, significantly. Home charging in Western Europe typically costs €0.20 to €0.35/kWh. Public AC chargers (7 to 22 kW) charge €0.35 to €0.55/kWh. DC fast chargers (50 to 350 kW) cost €0.55 to €0.80/kWh or higher. A 60 kWh charge costs roughly €12 to €21 at home versus €33 to €48 at a DC fast charger. Off-peak overnight home charging gives the lowest cost per kilometre.
How much does it cost to charge an EV from 20% to 80%?
It depends on battery size and electricity rate. For a 77 kWh battery that is 46.2 kWh. At €0.30/kWh (typical home tariff) the cost is €13.86; at €0.50/kWh (public AC charger) it is €23.10; at €0.65/kWh (DC fast charger) it reaches €30.03. Enter your values above for an exact figure.
What electricity rate should I use for home vs public charging?
Home charging on a standard tariff in Western Europe typically costs €0.20–€0.35/kWh. Public AC chargers (11–22 kW) usually charge €0.35–€0.50/kWh. Public DC fast chargers (50–350 kW) range from €0.50–€0.75/kWh or higher depending on the network. Some providers charge per minute rather than per kWh — in that case use the EV Charging Time Calculator to estimate session duration first.
What is a typical EV consumption in Wh/km?
Compact EVs (e.g. Renault Zoe, VW ID.3 small trim) consume around 130–160 Wh/km in mild conditions. Family sedans and mid-size EVs typically use 160–200 Wh/km. Large SUVs and vans range from 200–280 Wh/km. Cold weather, motorway speeds above 120 km/h, and heavy climate use can increase consumption by 20–40%. Your car's trip computer efficiency screen gives the most accurate real-world figure.
Does the calculator account for charging losses?
No — the result shows kWh added to the battery, not kWh drawn from the grid. Real charging draws slightly more due to conversion losses: typically 5–12% for home AC charging, and 3–8% for DC fast charging (which bypasses the onboard charger). For a more accurate grid-cost estimate, multiply the result by 1.08–1.12.