EV Charging Cost & Time Calculator
What a charge from one battery level to another costs and takes at your tariff, charger power and charging efficiency, plus range added and cost per distance.
The kWh drawn from the grid, the cost and duration of the session, the range it adds, the running cost per distance, and an optional side-by-side with a petrol figure you enter.
Example: A 60 kWh battery from 20 % to 80 % takes 36 kWh — 40 kWh from the grid at 90 % efficiency — costing 12.00 at 0.30/kWh, 3.6 h at 11 kW; at 16 kWh/100 km it adds 225 km at 5.33 per 100 km.
Kilowatt-hours in,
kilometres out.
The five sums, why the grid draws more than the battery gains, and what the time estimate assumes.
Energy, cost, time
The battery gains capacity × (target − start) percent. Charging is not lossless — the on-board charger, cables and battery heating turn some grid energy into heat — so the grid supplies that amount divided by the efficiency you enter, and that larger figure is what the meter bills at your price per kWh. Time is grid energy divided by charger power, a constant-power estimate.
Range and running cost
Range added is battery energy divided by the car's consumption (kWh per 100 km, or kWh per mile in imperial mode). Cost per distance is consumption ÷ efficiency × price, which is independent of the session and is the figure to compare with a petrol car: enter L/100 km (or mpg) and a fuel price and the page shows that cost per distance beside it, with no verdict attached.
What is not modelled
Charge curves: DC fast chargers slow down as the battery fills and AC sessions are capped by the car's on-board charger, so enter the lower power and expect the top of the range to take longer. Time-of-use tariffs, idle fees, battery degradation and cold-weather consumption are all yours to reflect in the inputs. Nothing leaves the browser; the same four anonymous usage counts as the rest of the site apply.
SOURCES
- Energy arithmetic only (kWh = kW × h; losses as the efficiency you enter). Charging efficiency, tariffs, taper curves and consumption figures are the user’s own — none is embedded
Last reviewed 19 September 2026. How results are checked: How we verify.