How is the charging cost calculated?

The tool finds the kWh added by taking the percentage gained (to minus from) multiplied by your battery capacity, then multiplies that energy by your price per kWh. Charging losses are not included, so real-world cost may be slightly higher.

How is range gained estimated?

It divides the kWh added by your consumption figure (kWh per 100 km) and multiplies by 100. Lower consumption means more range per kWh.

Is my charging or pricing data uploaded?

No — every calculation runs entirely in your browser and nothing is uploaded.

How much does it cost to charge an EV from 20% to 80%?

For a 60 kWh battery, 20% to 80% adds 60% of 60 = 36 kWh. At 0.30 per kWh that is 36 × 0.30 = 10.80. Larger batteries or higher unit prices raise the figure proportionally.

Why charge to 80% instead of 100%?

Lithium-ion batteries last longer when kept below full charge, and the final 20% on a fast charger is much slower. Many manufacturers recommend a daily 20%–80% window, which is why it is the common default here.

Does the calculator include charging losses?

No. It assumes the energy drawn equals the energy stored. In reality 5–15% is lost as heat in the charger and cables, so your meter and real bill will read a little higher than the result shown.

Is home charging cheaper than public charging?

Usually yes. Home electricity, especially on an off-peak overnight tariff, is typically far cheaper per kWh than public rapid chargers. Enter your own price per kWh to compare both scenarios.

EV Charging Cost Calculator

EV charging cost calculator

Charging an electric car is priced by energy, not by the litre, so the cost depends on how much you add and your electricity rate — not the size of the “tank”. This calculator turns your battery size, charge window and unit price into a clear cost, plus the energy added and the driving range you gain.

How it works

Three numbers drive the result. The energy added is the percentage you charge through (to% − from%) applied to your battery capacity: kWh added = capacity × (to − from) / 100. The cost is that energy times your price: cost = kWh added × price per kWh. The range gained uses your efficiency figure in kWh per 100 km: range = kWh added ÷ efficiency × 100. Charging losses aren’t included, so the real-world cost is typically a little higher.

Example

A 60 kWh battery charged from 20% to 80% at 0.30 per kWh, with efficiency 16 kWh/100 km:

Step	Value
Energy added	60 × (80 − 20)/100 = 36 kWh
Charge cost	36 × 0.30 = 10.80
Range gained	36 ÷ 16 × 100 = 225 km

It all runs in your browser, so nothing about your car or tariff is uploaded.