🔌 EV Charging Time Calculator
Enter your battery size, the charge levels and the charger power to estimate the charging time and energy added.
Charging time
3 h 38 min
Energy added
36 kWh
Charging time = energy needed ÷ (charger power × efficiency), where energy needed = battery capacity × the change in state of charge. Real charging slows as the battery fills — DC rapid charging tapers sharply above ~80%, so this is an average estimate. AC charging is limited by the car's onboard charger, not just the wall unit. 🔒 In your browser.
How the ev charging time calculator works
The energy you need is the battery capacity times the change in state of charge (SoC): a 60 kWh battery going 20% → 80% needs 60 × 0.60 = 36 kWh. Divide by the charger's effective power (its rated kW times a charging efficiency, since some energy is lost as heat) to get the time. Presets cover everything from a 3-pin plug (2.3 kW) to ultra-rapid DC (350 kW).
This is an average estimate. Real charging isn't constant: DC rapid charging tapers sharply above about 80% to protect the battery, so the last 20% takes disproportionately long — which is why rapid-charge figures are usually quoted 10–80%. AC charging is also capped by the car's onboard charger, so a 22 kW wall box won't help a car limited to 7.4 kW AC.
Frequently asked questions
How long does it take to charge an electric car?
Time = energy needed ÷ (charger power × efficiency). A 60 kWh car charging 20→80% (36 kWh) at 11 kW and 90% efficiency takes about 3.6 hours; on a 50 kW rapid charger, under an hour. It depends heavily on the charger and the car's limits.
How do you calculate EV charging time?
Work out the energy to add — battery capacity × the change in state of charge — then divide by the charger's effective power (rated kW × charging efficiency). The tool does this and shows the energy added too.
Why does the last 20% charge so slowly?
To protect the battery, DC fast chargers taper the power as the battery fills, so charging above ~80% is much slower. That's why rapid-charge times are usually given for 10–80%, and why topping right up on a road trip isn't worth the wait.
Does a more powerful charger always charge faster?
Only up to the car's own limit. AC charging is capped by the onboard charger (often 7.4 or 11 kW), so a bigger AC unit won't help beyond that. DC charging is capped by the car's maximum accept rate. Enter the lower of the charger and car limits.
What charging efficiency should I use?
Around 85–90% is typical — some energy is lost as heat in the charger, cables and battery. Slower AC charging tends to be a bit less efficient in percentage terms; the tool lets you set it.