EV charging time calculator

How long to charge from one level to another, on a home charger or a fast charger.

Start from a car (optional)

Fills in what you leave blank, using figures published by the maker or EPA. Anything you type wins.

Usable battery (kWh)

The part of the battery you can use, not the headline size.

Charge now (%)

Charge to (%)

Charger type

Charger power (kW)

Wall box: often 7.4 or 11 kW. Fast charger: 50 to 350 kW.

Most the car can take (kW)

Optional. Blank uses the chosen car's published figure.

Charging efficiency (%)

Optional. Blank uses 90 % for AC and 95 % for DC.

Country, units and currency (Bangladesh)

Country

Sets the usual units and currency, and the grid's CO2 where it applies. Press the button after changing it.

Your answer appears here Fill in what you know and press the button. Every assumption is shown next to the result.

How it works

Energy added = usable battery × (end % − start %).
Energy from the charger = energy added ÷ charging efficiency. Some energy is lost as heat; we assume 90 % on AC and 95 % on DC unless you change it.
AC time = energy ÷ the lower of the charger's power and the car's on-board charger power.
DC time is added up one percent at a time. Each step uses the lower of the charger's power and the car's power at that level, read from the car's published charging curve when we have it. Otherwise we use full power up to 80 % and a straight taper to 20 % of it at 100 %, and say so.

This is an estimate. Battery temperature, age, the charger's real output and the car's own limits change it. For installing or upgrading a home charger, ask a licensed electrician.

Keep your numbers in EVFolk

The app does these sums for you from your real charges: what you spent, what you saved against petrol and the CO2 you avoided. Use it on the web today, or on your phone.

Coming soonGoogle Play Coming soonApp Store

Open the web app Phone app launch list