Calculator Inputs
Example Data Table
| Scenario | Battery (kWh) | Charge Window | Power (kW) | Price per kWh | Total Cost | Time |
|---|---|---|---|---|---|---|
| Home Charging | 75 | 20% to 80% | 11 | 0.18 | 13.90 | 4.65 hr |
| Public AC Charging | 64 | 30% to 90% | 22 | 0.32 | 16.87 | 2.18 hr |
| Public DC Fast Charging | 82 | 10% to 80% | 120 | 0.46 | 33.78 | 0.68 hr |
These examples illustrate how charger speed, tariffs, fees, and efficiency losses can change the final charging bill.
Formula Used
Battery Energy Added = Battery Capacity × (Target Charge − Starting Charge) ÷ 100
Grid Energy Purchased = Battery Energy Added ÷ (Charger Efficiency ÷ 100)
Charging Losses = Grid Energy Purchased − Battery Energy Added
Effective Charging Power = Charger Power × (Average Power Factor ÷ 100)
Charging Time = Battery Energy Added ÷ Effective Charging Power
Total Session Cost = (Energy Cost + Session Fee + Parking Cost) + Taxes
Range Added = Battery Energy Added ÷ Vehicle Efficiency × 100
Cost per 100 km = Total Session Cost ÷ Range Added × 100
How to Use This Calculator
- Choose your charging scenario and enter your preferred currency symbol or code.
- Type the battery capacity and the current and target charge percentages.
- Enter charger power, efficiency, and the average power factor for tapering.
- Add the energy tariff, fixed session fee, parking fee, and tax rate.
- Enter the vehicle efficiency and the number of monthly charging sessions.
- Press the calculate button to display the results above the form.
- Use the export buttons to download the result summary as CSV or PDF.
FAQs
1. What does this calculator estimate?
It estimates charging time, purchased grid energy, energy losses, total session cost, range added, monthly spend, and annual charging budget.
2. Why is grid energy higher than battery energy added?
Chargers and batteries are not perfectly efficient. Some electricity becomes heat, cooling load, or conversion loss before the battery stores it.
3. What is the average power factor field?
It represents charging taper. Many EVs slow down near higher charge levels, so the average power across the full session is lower than the charger rating.
4. Can I compare home and public charging?
Yes. Change the scenario, tariff, session fee, power rating, and parking fee to model home, workplace, AC public, or fast charging sessions.
5. How should I enter vehicle efficiency?
Use the vehicle’s energy use in kWh per 100 kilometers. This lets the calculator estimate range added and charging cost per 100 kilometers.
6. Does the calculator include taxes and idle fees?
Yes. You can add a tax percentage, a fixed session fee, and an hourly parking or idle fee for more realistic charging costs.
7. How do monthly and annual totals work?
The calculator multiplies the session cost by your monthly session count. Annual cost is simply the monthly total multiplied by twelve.
8. Is this suitable for planning charging budgets?
Yes. It is useful for comparing charging options, forecasting travel energy expense, and understanding how tariffs and efficiency affect ownership costs.