EV Charging Time Calculator
Estimate how long an EV will take to charge from its battery size, starting percentage, target percentage, charger power, vehicle limit and charging losses.
Quick answerA 60 kWh EV charging from 20% to 80% needs 36 kWh in the battery. At 7.4 kW and 90% efficiency, the simple estimate is about 5.4 hours. Your real time can be longer if the car accepts less power, the battery is cold, or charging tapers near the target.
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Simple constant-power estimate; allow extra time for tapering and temperature.
The lower of charger output and the vehicle maximum.
Compare Level 2 charging equipment after the compatibility check
Your result tells you whether faster charging helps. The vehicle, connector, circuit, location, and local electrical rules determine what equipment can fit.
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Before shopping: check whether Level 1 already covers your driving and what Level 2 installation requiresAmazon opens in a new tab. Before ordering, confirm the vehicle connector or approved adapter, charging limit, circuit voltage and capacity, plug-in versus hardwired installation, cable reach, outdoor rating, safety certification, permits, utility requirements, and qualified installation.
How it works
Battery energy to add = usable capacity × (target % − start %) ÷ 100. Effective power = the lower of charger output and the vehicle maximum. Grid energy = battery energy ÷ charging efficiency. Estimated time = grid energy ÷ effective power. This is a constant-power estimate; actual DC fast charging varies along the vehicle charging curve.
Charging-time examples for a 60 kWh EV from 20% to 80%
These formula examples add 36 kWh to the battery and assume 90% charging efficiency. They are not promises for a specific vehicle.
| Charging setup | Power used | Simple estimate |
|---|---|---|
| Level 1 AC | 1.9 kW | 21.1 hours |
| Level 2 AC | 7.4 kW | 5.4 hours |
| Level 2 AC | 11 kW | 3.6 hours |
| DC fast (constant-power example) | 50 kW | 0.8 hours |
The DC example is mathematical only. Real fast charging usually changes power during the session, especially at higher states of charge.
Worked example: 20% to 80% on a 7.4 kW home charger
For a 60 kWh usable battery, the change from 20% to 80% is 60 percentage points. Battery energy needed = 60 kWh × 0.60 = 36 kWh. At 90% efficiency, the charger must supply 36 ÷ 0.90 = 40 kWh. If both the charger and car support at least 7.4 kW, estimated time = 40 ÷ 7.4 = 5.4 hours.
Why the charger label is not always the power your car receives
Charging is limited by the weakest part of the path. A high-power charging unit cannot make an EV accept more than the vehicle allows. AC charging also passes through the vehicle’s onboard charger, while DC fast charging sends DC power to the battery more directly. Enter both published limits and the calculator will choose the lower one.
Why real fast-charging time can be longer
DC fast chargers and vehicle advertisements often quote peak power, but an EV does not necessarily hold that peak for the entire session. Battery temperature, state of charge, shared station power and the vehicle charging curve can reduce average power. For a better road-trip estimate, use the vehicle’s documented average power over the charge window when available.
Sources used for assumptions: U.S. Department of Energy Alternative Fuels Data Center — Electric Vehicle Charging Stations; U.S. Department of Energy — EV Supply Equipment Infrastructure Training.
Frequently asked questions
Why does EV charging slow near a high state of charge?
The vehicle controls battery charging power and commonly reduces it as the battery fills. The exact taper point and curve vary by vehicle, battery temperature and charging conditions.
Should I enter the charger rating or the car’s maximum?
Enter both. The calculator uses the lower value because a charger cannot exceed its own output and a vehicle cannot accept more than its charging limit.
How do I calculate charger power from volts and amps?
For a simple single-phase estimate, kilowatts = volts × amps ÷ 1,000. Actual delivered power can be lower, and three-phase charging uses a different formula.
Does temperature affect EV charging time?
Yes. A cold or hot battery can accept less power while the vehicle heats or cools the pack, so the session may take longer than a constant-power estimate.
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