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. It is one of the cost tools in our EV & Energy Hub, which collects the charging, range, and running-cost calculators in one place.
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
Where charging cost fits in the EV picture
Cost is one answer in a short series of questions every EV owner works through, and it depends on the ones before it. What you can install at home sets your everyday rate; how long a session takes decides whether you charge overnight or pay for speed; and the figure here feeds the bigger comparison against petrol and the budget for a trip. The order most people meet them in:
- Work out what your home can charge at. A 7.4 kW wallbox is the everyday baseline, and your consumer unit decides whether it is possible. The home charger planner checks what your installation supports.
- See how long a charge takes. Power, not the car, sets the speed: an overnight socket and a rapid charger are worlds apart. The charging time calculator models the taper above 80%.
- You are here: price the charge. Energy added times your rate. The rate is the lever, so keep your home tariff in for the everyday figure and swap in the public price only when planning a trip.
- Turn that into cost per kilometre. The range and cost calculator divides energy by your consumption so you can compare against fuel directly.
- Compare a full year against petrol. Over a year of real driving the saving becomes concrete. The EV vs petrol calculator uses your distance, tariff and pump price.
- Check a specific journey. The trip planner tells you whether the range covers the route or a stop is needed.
- Cut the rate with your own roof. Charging from panels pushes the rate toward zero. The solar panels for EV charging calculator sizes an array against your daily kilometres.
A note from my own driving: the number that moves the cost most is not the battery size, it is where you plug in. The same charge that costs a few euros overnight at home can run three times as much at a motorway rapid charger, and the gap widens again when you cross a border onto another network's tariff. I keep the home rate in this calculator for the everyday figure and only swap in a public rate when I am planning a trip, because mixing the two hides how cheap home charging really is.
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.
Methodology and sources
This tool works out the energy added to an EV battery for a given charge window and what that energy costs at your tariff, then optionally converts the energy into approximate range. It is plain energy arithmetic, not a battery model.
- Method: kWh added = battery (kWh) × (target% − start%) / 100; cost = kWh added × rate (€/kWh); range added = kWh added × 1000 / consumption (Wh/km).
- Standards and sources: standard energy arithmetic, no formal wiring or product standard is implemented. Energy is in kilowatt-hours (kWh) and the per-kWh rate is the price you pay; the result is a direct multiplication, not a tariff lookup.
- Assumptions and limits: the result is energy added to the battery, not energy drawn from the grid, so it excludes charging conversion losses (typically about 5 to 12% on AC, 3 to 8% on DC). It uses your usable battery capacity and a single flat rate per kWh; per-minute pricing, session/connection fees, taxes and time-of-use tariffs are not modelled. Real-world range varies with speed, temperature and driving style.
Reviewed and maintained by Rick Oosterling, who builds and wires 12 V, solar and EV systems hands-on. Last reviewed: June 2026. Estimates only; tariffs, prices and usage vary, so treat the figures as a planning guide rather than a precise bill.