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CALCULATOR · Finance

EV Charging Cost Calculator

What a charging session costs and how far it takes you — from pack size, your tariff and the charger's losses.

Show formula
energy added = pack × Δ% · wall energy = added ÷ charger efficiency · cost = wall energy × price per kWh · range = added × 100 ÷ consumption

Inputs

The usable pack size from the spec sheet — gross figures include a buffer the gauge never shows.

20
80

kWh the car uses per 100 km — the spec-sheet or EPA figure. Your own trip-computer average is even better.

—

Wall-to-battery losses. Home AC charging loses about 10% — the meter sees more than the battery gets.

Your price for one kWh at the meter — the home tariff line on the bill, or the charger's price per kWh.

Result

Your result appears here

Enter Battery capacity and the result fills in as you type.

How it works

  1. Enter the usable pack size from the spec sheet and the charge window you actually use — most daily charging lives between 20 and 80%.
  2. Add the car’s consumption in kWh per 100 km (or per 100 miles) and the charger efficiency — home AC charging loses around 10% between the meter and the battery.
  3. Enter your price per kWh to get the session cost, the cost of a full charge, the rate per 100 km and the range the session adds.

Frequently asked questions

Why does the meter show more kWh than went into the battery?

Charging is not loss-free: converting AC to DC and pushing energy into the cells wastes 8–12% in a home wallbox, and the battery’s management keeps a little more as heat. The calculator bills the wall-side figure — the one the meter and the electricity bill actually see.

What consumption figure should I use?

The car’s own average from the trip computer, if it shows one. The window-sticker rating is measured on a rolling road and usually flatters mixed driving, so a measured kWh per 100 km makes the cost match the meter the same way a measured fuel figure matches the pump.

Does this work for public fast-charging prices?

Yes — the price field is per kWh, so a DC charger’s rate works exactly like a home tariff. What the calculator deliberately leaves out are per-minute pricing and session fees, which some networks bill on top of the energy rate; add them mentally if your network charges that way.

Examples

Charging a 60 kWh EV that uses 18 kWh/100 km from 20% to 80% at 0.30 per kWh with a 90%-efficient wallbox
36 kWh into the battery, 40 kWh from the wall — 12.00, 0.06 per kilometer, adding 200 km of range.
A 75 kWh pack from 20 to 80% at 0.15 per kWh and 25 kWh/100 mi
50 kWh from the wall — 7.50, about 0.042 per mile, adding 180 miles of range.

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