EV charging time calculator
Charging time depends on three things: how much energy you add (battery size x percentage gained), how fast the charger delivers it (kW), and how fast the car can accept it. This calculator uses the lower of the charger and car limits and allows for charging losses.
How it works
time (hours) = energy added (kWh) / charging power (kW)
Energy added is usable battery kWh x (end % - start %). Charging power is the lower of the charger and the car's maximum rate, reduced by charging efficiency.
DC rapid charging slows down as the battery fills, especially above about 80%, so treat rapid-charging times as a guide. AC charging (home, workplace, destination) stays close to constant power. This is an estimate: real times vary with temperature, battery condition and the car.
Worked example
A 60 kWh battery from 10% to 80% adds 42 kWh. On a 7 kW charger at 90% efficiency the battery receives 6.3 kW, so it takes 6 h 40 min and draws 46.67 kWh from the grid.
Frequently asked questions
How long does it take to charge an electric car at home?
On a 7 kW home charger, adding 42 kWh (for example 10% to 80% of a 60 kWh battery) takes roughly 6 to 7 hours. A 3-pin plug at about 2.3 kW takes around three times as long.
How long does 10 to 80% take on a rapid charger?
It depends on the car's maximum charge rate, not just the charger. Many cars take roughly 20 to 40 minutes for 10 to 80% on a suitable rapid charger, but check your car's rated figure.
What are typical charging powers?
A 3-pin plug is about 2.3 kW, a home wallbox is typically 7 kW, three-phase AC is 11 kW (or up to 22 kW), rapid DC chargers start around 50 kW and ultra-rapid chargers range from about 100 kW to 350 kW.
Why does charging slow down at 80%?
To protect the battery, cars reduce the charging rate as the battery fills, particularly on DC rapid chargers. That is why 80% to 100% takes much longer than 10% to 80%.