EV Charging Cost Calculator

Battery capacity, kWh

Charge now, %

Charge to, %

Price per kWh

Charger power, kW

Advanced options

Charging losses, %

Result

kWh into the battery36
kWh from the wall39.6
Cost$237.60
Charging time5 ч 39 мин
Hours5.66
Roughly per 100 km$118.80

The wall always gives up more than the battery takes

Kilowatt-hours drawn from the wall, what they cost and how long the charge takes, including conversion losses.

There is always a gap between what the battery gains and what the meter records. Some energy is lost in the onboard charger and some goes to heating or cooling the pack — around ten percent on AC charging, more in winter.

Charging also rarely runs from zero to full. The usual window is 20 to 80 percent: below twenty is uncomfortable, and the last twenty charge noticeably slower because current is tapered to protect the cells.

What this calculator shows

Kilowatt-hours into the battery and out of the wall
The cost and the time to reach your target charge
Roughly what a hundred kilometres of range costs

What to keep in mind

Ten percent loss is typical for AC charging; DC rapid charging loses less and freezing weather loses more.
Time assumes constant power; real charging tapers after about 80 percent.

FAQs

Why does the wall supply more than the battery gains?

Losses in the onboard charger and in battery thermal management. Around ten percent on AC, up to twenty in winter when the pack has to be warmed first.

Why does charging slow after 80 percent?

The system tapers current deliberately to limit heat and extend pack life. The last twenty percent can take as long as the first sixty.

How much does public charging cost?

Several times home charging. DC rapid chargers run at 15 to 30 ₽ per kWh against 4 to 6 at home on a night tariff.

How much range does winter cost?

20 to 40 percent, between cabin heating, battery warming and reduced cell output in the cold. Preconditioning while still plugged in helps considerably.

Worked example

An overnight charge at home

Input: 60 kWh pack, 20 to 80 percent, 6 ₽/kWh, 7 kW charger

Output: 36 kWh into the battery, 39.6 from the wall, 237.6 ₽ over 5.7 hours

Note: That is roughly 240 km of range, about a rouble per kilometre. A petrol car at 8 l/100 km would spend 1,150 ₽ on the same distance.

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Result

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