EV Charging Cost Calculator
Estimate electric car charging costs from battery kWh, charge level, and electricity tariff.
Loading tool...
What is EV Charging Cost Calculator?
The EV Charging Cost Calculator estimates what it costs to charge an electric car at home. It combines battery capacity, the state-of-charge window you actually use, charging efficiency losses, and your electricity tariff to produce the cost of a single session, cost per kilometer, and a monthly projection — then compares the total with an equivalent petrol car.
Key Benefits
- See the true cost of a charging session, including efficiency losses
- Budget monthly energy spend from your real driving distance
- Compare EV and petrol running costs per km before buying
- Test off-peak tariffs and different charge windows instantly
- Works offline with any currency and any electricity rate
Common Use Cases
- •Deciding between an EV and a petrol car using local fuel and electricity prices
- •Estimating home charging spend before installing a wallbox
- •Comparing off-peak and time-of-use electricity plans
- •Checking how much a 20-80% routine charge actually costs
- •Building a monthly car budget that includes charging costs
How to Use the EV Charging Cost Calculator
- Enter battery and charge levels: Type your battery capacity in kWh, the current charge level, and the target level you usually charge to, such as 20% to 80%.
- Set your electricity tariff: Enter the price you pay per kWh and pick a currency symbol. Adjust charging efficiency if you know it — 90% is a typical default.
- Add your driving profile: Fill in your EV consumption in kWh per 100 km and your monthly driving distance to get monthly energy use and cost.
- Compare with a petrol car: Enter petrol price per liter and the fuel consumption of a comparable petrol car to see your monthly savings and savings percentage.
Key Features
- Charging session cost with state-of-charge range and efficiency losses included
- Cost per 100 km and cost per km from your EV consumption and tariff
- Monthly energy and cost projection from your driving distance
- EV vs petrol comparison with monthly savings and savings percentage
- Custom currency symbol and any electricity rate, including off-peak plans
- Copyable summary and instant recalculation — fully offline
Frequently Asked Questions
How much does it cost to charge an EV at home?
It depends on your battery size, how much you recharge, and your electricity tariff. For example, charging 60% of a 60 kWh battery at 90% efficiency on a $0.16/kWh tariff costs about $6.40. Enter your own numbers above for a precise estimate.
Why is charging efficiency included in the calculation?
Not all energy from the grid reaches the battery — some is lost as heat in the charger and onboard electronics. Typical AC charging efficiency is 85-95%, so a 90% default is a realistic middle ground. Ignoring it would understate your real electricity cost.
How do I find my EV consumption in kWh per 100 km?
Most EVs show average consumption on the dashboard or in their companion app — typically 13-20 kWh/100 km depending on model, speed, and climate. You can also divide kWh recharged by distance driven over a few trips.
Is home charging really cheaper than petrol?
In most markets, yes — often by 50-70% on a per-km basis. This tool computes the comparison directly from your tariff and local petrol price. Note that public DC fast chargers can cost several times more per kWh than home rates.