EN

EV charging time calculator – how long will it take to charge?

Use this EV charging time calculator to find out how long your electric car takes to charge: enter the battery size, the start and target charge level and the charger power, and you instantly see the duration, the energy used and the miles or kilometers of range you gain.

Source: ADAC – Ladeverluste beim Elektroauto: Messung an Steckdose, 11-/22-kW-Wallbox und DC-Schnellladen (Stand 06.08.2026, abgerufen 30.09.2026). Updated: .

kWh
From the spec sheet; usable capacity is usually a bit below the gross figure
%
%
80% is often enough for daily use
From 30 kW the calculator uses direct current (DC), below that alternating current (AC)
kW
Onboard charger, often 11 kW; see the spec sheet. The car never charges faster than this.
kW
Peak value at a fast charger according to the spec sheet
%
Wallbox typically 5–10%, household socket considerably more
mi/kWh
My ToolboxYour inputs are saved in this browser only.

Result

Charging time
3 h 38 min
Effective charging power
11 kW (alternating current)
Energy
36 kWh into the battery, which takes 40 kWh from the grid (10% charging losses).
Range
That adds about 126 mi; at the target charge level about 168 mi in total.
Working
36 kWh ÷ (11 kW × 90% efficiency) = 3 h 38 min.
With alternating current, power drops slightly in winter, with a cold battery and with partly charged cars; the charging losses are adjustable. The result is an estimate: temperature, battery condition and charging station change the time.

How it is calculated

How the charging time is calculated

The basic formula is simple: charging time = energy ÷ power. The energy comes from the battery size and the charge swing. Example: a 60 kWh battery charged from 20% to 80% takes in 60 × 0.6 = 36 kWh. On an 11 kW wallbox with 10% charging losses, 11 × 0.9 = 9.9 kW reaches the battery, so the charging time is 36 ÷ 9.9 ≈ 3 h 38 min.

What decides the charging power

Range gained

The range you add is the energy charged divided by your consumption: 36 kWh at 18 kWh/100 km is 200 km. Use the real-world consumption from the trip computer, because the rated figure is often lower. What the charge costs is worked out by the EV charging cost calculator; the watts to amps calculator converts watts and amps, and the electricity cost calculator covers appliances.

Limits

Cold weather, a warm or cold battery, other users at the charging post and your car’s individual charging curve change the duration by minutes to hours. Treat the result as a guide, not a promise.

Frequently asked questions

How do I calculate my EV’s charging time?

Battery capacity times the charge swing (target minus start in percent) gives the energy in kWh; divided by the charging power in kW it gives the hours. The calculator accounts for charging losses and the car’s limits.

How long does charging take on an 11 kW wallbox?

With a 60 kWh battery from 20 to 80%, about 3 h 38 min at 10% charging losses. From 10 to 100% it takes about 5 h 27 min.

Why does my car not charge faster on a 22 kW post?

Because the onboard charger is the limit: many cars only accept 11 kW of alternating current. It only goes faster at a direct-current fast charger.

Why does charging slow down above 80%?

The battery and its management system reduce power at a high charge level to protect the cells. The calculator assumes 30% of the power there.

How do I calculate the range I add?

Energy charged in kWh divided by consumption in kWh per kilometer. 36 kWh at 18 kWh/100 km gives 200 km.

How many amps does an 11 kW wallbox need?

Three-phase about 16 A per phase (3 × 230 V × 16 A ≈ 11 kW). Single-phase it is 16 A for 3.7 kW and 32 A for 7.4 kW.

Sources and legal basis

As of:

Related tools