Electric Vehicle Charging Time Calculator
Estimate the time it will take to charge an electric vehicle by entering the battery capacity and charge level along with the charging power below.
Estimated Charging Time:
How to Estimate EV Charging Time
The actual time it takes to charge the battery of an electric vehicle (EV) depends on a variety of factors. These include the charger’s power output, the size of the EV’s battery, and the EV’s current charge level, also known as its state of charge (SOC).
The capacity of an EV’s battery is measured by the number of kilowatt-hours (kWh) of energy it can hold. The charger’s power output will determine the speed of the charge and is measured in kilowatts (kW).
To calculate the amount of time it will take to charge an EV, use the following formula:
charge time = battery capacity / charge power × .9
In other words, the amount of time it takes to charge in hours is equal to the size of the battery in kilowatt-hours divided by the charging power multiplied by .9, which is the average power efficiency.
For example, let’s estimate the charging time required for a 2021 Tesla Model 3 with a 50 kWh battery, from 0% to 100% capacity, using a 3.7 kW home charger.
charge time = 50 kWh / 3.7 kW × .9
charge time = 50 kWh / 3.33
charge time = 15.015 hours
This means that it will take about 15 hours to charge the Tesla Model 3 from 0% to 100% capacity using a 3.7 kW charger.
Because an EV battery typically has a partial charge, charging from 0 to 100% is not normally necessary. It is also possible to charge an EV battery to a partial capacity of less than 100%, which is usually recommended by EV manufacturers and will reduce the time needed to charge.
Most home chargers are known as Level 2 chargers, which run on 240V AC power and are 7.7kWh or smaller. Public fast chargers are known as Level 3 chargers and run on DC current in the 11kW to 50kW range.
It is also becoming more common to see Level 3 fast chargers delivering 100kW of charging power or more.
To learn more about the cost of charging an electric vehicle at home, check out our charging cost calculator.
Average Battery Charging Times
See the average time that it takes to charge an EV’s battery to full capacity using various chargers in the chart below. Factors such as extremely high or low ambient temperatures, as well as an EV’s charge acceptance rate (the rate at which it can accept a charge at various states of charge), can affect your actual battery charging time.
|Battery Capacity (kWh)||Charger|
|2.4 kW||3.7 kW||7.7 kW||11 kW||22 kW||50 kW||100 kW||120 kW|
|5 kWh||2h 19m||1h 31m||0h 44m||0h 31m||0h 16m||0h 7m||0h 4m||0h 3m|
|10 kWh||4h 38m||3h 1m||1h 27m||1h 1m||0h 31m||0h 14m||0h 7m||0h 6m|
|15 kWh||6h 57m||4h 31m||2h 10m||1h 31m||0h 46m||0h 20m||0h 10m||0h 9m|
|20 kWh||9h 16m||6h 1m||2h 54m||2h 2m||1h 1m||0h 27m||0h 14m||0h 12m|
|25 kWh||11h 35m||7h 31m||3h 37m||2h 32m||1h 16m||0h 34m||0h 17m||0h 14m|
|30 kWh||13h 54m||9h 1m||4h 20m||3h 2m||1h 31m||0h 40m||0h 20m||0h 17m|
|35 kWh||16h 13m||10h 31m||5h 4m||3h 33m||1h 47m||0h 47m||0h 24m||0h 20m|
|40 kWh||18h 32m||12h 1m||5h 47m||4h 3m||2h 2m||0h 54m||0h 27m||0h 23m|
|45 kWh||20h 50m||13h 31m||6h 30m||4h 33m||2h 17m||1h||0h 30m||0h 25m|
|50 kWh||23h 9m||15h 1m||7h 13m||5h 4m||2h 32m||1h 7m||0h 34m||0h 28m|
|55 kWh||25h 28m||16h 31m||7h 57m||5h 34m||2h 47m||1h 14m||0h 37m||0h 31m|
|60 kWh||27h 47m||18h 2m||8h 40m||6h 4m||3h 2m||1h 20m||0h 40m||0h 34m|
|65 kWh||30h 6m||19h 32m||9h 23m||6h 34m||3h 17m||1h 27m||0h 44m||0h 37m|
|70 kWh||32h 25m||21h 2m||10h 7m||7h 5m||3h 33m||1h 34m||0h 47m||0h 39m|
|75 kWh||34h 44m||22h 32m||10h 50m||7h 35m||3h 48m||1h 40m||0h 50m||0h 42m|
|80 kWh||37h 3m||24h 2m||11h 33m||8h 5m||4h 3m||1h 47m||0h 54m||0h 45m|
|85 kWh||39h 22m||25h 32m||12h 16m||8h 36m||4h 18m||1h 54m||0h 57m||0h 48m|
|90 kWh||41h 40m||27h 2m||13h||9h 6m||4h 33m||2h||1h||0h 50m|
|95 kWh||43h 59m||28h 32m||13h 43m||9h 36m||4h 48m||2h 7m||1h 4m||0h 53m|
|100 kWh||46h 18m||30h 2m||14h 26m||10h 7m||5h 4m||2h 14m||1h 7m||0h 56m|
|110 kWh||50h 56m||33h 2m||15h 53m||11h 7m||5h 34m||2h 27m||1h 14m||1h 2m|
|120 kWh||55h 34m||36h 3m||17h 19m||12h 8m||6h 4m||2h 40m||1h 20m||1h 7m|
|130 kWh||60h 12m||39h 3m||18h 46m||13h 8m||6h 34m||2h 54m||1h 27m||1h 13m|
|140 kWh||64h 49m||42h 3m||20h 13m||14h 9m||7h 5m||3h 7m||1h 34m||1h 18m|
|150 kWh||69h 27m||45h 3m||21h 39m||15h 10m||7h 35m||3h 20m||1h 40m||1h 24m|
- R.E. Fulton, Tesla Model 3 Battery Size, Jerry, https://getjerry.com/car-repair/tesla-model-3-battery-size