Charging losses matter
The wall energy used can be higher than the energy added to the battery. This page includes charging efficiency so home and public charging estimates are not understated.
Example
If the car receives 40 kWh, the electricity price is 0.20 per kWh and charging efficiency is 90%, the charger must draw about 44.44 kWh from the grid. The session cost is therefore about 8.89 before any parking fee, idle fee or charging-network surcharge.
What the estimate includes
The calculator uses the energy added to the battery, charging loss and your entered electricity price. It is best for comparing home charging, workplace charging or public charging sessions when you already know the price per kWh.
Limitations
Real charging bills can also include session fees, time-based fees, peak pricing, taxes, parking costs or subscription discounts. Battery preconditioning and very cold weather can also change the energy used.
Last reviewed: 2026-05-17