To find out how long your electric vehicle will take to charge, one formula is all you need: charging time = energy required (kWh) ÷ actual charging power (kW). In this article, we'll walk through EV charging time calculation step by step, clarify the difference between AC and DC charging, and give realistic examples based on popular models sold in Turkey.

We'll also explain why this seemingly simple calculation often goes wrong in practice: factors like the charging curve, efficiency losses, the vehicle's own limits, and ambient temperature can significantly change the actual time.

The EV Charging Time Formula

The basic formula is:

Charging time (hours) = Energy required (kWh) ÷ Charging power (kW)

To find the energy required, you need to know the battery's usable capacity, its current state of charge, and your target state of charge:

Energy required = Battery capacity × (Target % − Current %)

Step-by-Step Example

Say you have a vehicle with a 60 kWh battery, currently at 20%, and you want to charge it to 80%:

Energy required: 60 × (0.80 − 0.20) = 36 kWh
At a 50 kW DC station: 36 ÷ 50 = 0.72 hours ≈ 43 minutes
At a 22 kW AC station (if the vehicle supports it): 36 ÷ 22 ≈ 1 hour 38 minutes
On a 7.4 kW home wallbox: 36 ÷ 7.4 ≈ 4 hours 52 minutes

Here's the critical detail: the power you should use in the calculation is not the value on the station's label, but the lower of what the vehicle and the station can each support. Even if you plug into a 22 kW AC station, if your vehicle's onboard charger (OBC) is limited to 11 kW, charging won't go any faster than 11 kW — and the time doubles.

Don't Forget Efficiency Losses

Especially with AC charging, some of the electricity is lost as heat during conversion. In practice, it's realistic to factor in roughly 10% loss for AC charging. In other words, for a 36 kWh energy need, about 40 kWh is drawn from the grid — and the charging time stretches by about 10% accordingly. With DC charging, the conversion happens on the station side, so the loss reflected in the vehicle is lower.

What Determines Charging Power?

The biggest misconception in EV charging time calculation is assuming "station power = charging power." Actual charging power is determined by three factors together:

1. The Vehicle's Onboard Charger (OBC)

In AC charging, the unit that converts alternating current to direct current is inside the vehicle. Most vehicles sold in Turkey have an 11 kW OBC; some models are limited to 7.4 kW, while a few, such as the Renault Megane E-Tech, support up to 22 kW. In AC charging, this value is your ceiling.

2. The Vehicle's DC Charging Limit

In DC fast charging, the conversion happens at the station and current flows directly into the battery, which is why the power levels are much higher. But every vehicle has an upper limit it can accept: some vehicles top out at 100 kW, the long-range version of the Togg T10X reaches about 180 kW, and some premium models can go to 250 kW and beyond. Plugging into a 300 kW station won't shorten your charging time if your vehicle is limited to 130 kW.

3. The Station's Power and Its Current Condition

The station's rated power is a ceiling value. At some DC stations, power is shared between two connectors; if two vehicles are plugged in at the same time, each may receive lower power.

AC vs. DC Charging: Time Comparison

The table below shows approximate charging times for a vehicle with a 60 kWh battery charging from 20% to 80% (taking on 36 kWh of energy) across different charging options:

Charging Type	Power	Approx. Time (20%→80%)	Typical Use
Household socket (schuko)	2.3 kW	~17.5 hours	Emergencies, overnight charging
Home wallbox (single-phase)	7.4 kW	~5 hours	Home/workplace, overnight charging
AC station (three-phase)	11 kW	~3.5 hours	Malls, car parks, residential complexes
AC station (three-phase)	22 kW	~1 hr 40 min*	If the vehicle supports it
DC fast charging	60 kW	~36 min	Quick top-ups in the city
DC fast charging	120 kW	~20 min**	Intercity travel
DC ultra-fast charging	180+ kW	~15 min**	Vehicles that support high power

* Most vehicles are limited to 11 kW on AC; 22 kW only applies if the OBC supports it. ** In DC charging, power doesn't stay constant; the times in the table assume ideal conditions where average power stays close to peak. In reality, charging may take somewhat longer.

Factors That Throw Off the Calculation

The Charging Curve: Peak Power Isn't Constant

In DC charging, a vehicle typically accepts peak power only in the 10–50% state-of-charge range, and only briefly. Once the battery passes 80%, the battery management system significantly reduces power to protect the cells; the final 20% can take longer than the first 60%. That's why the practical rule for road trips is: unplug at 80% at DC stations and get back on the road. You save time and free up the charger for other drivers waiting.

Temperature

Battery chemistry slows down in the cold. In winter, especially if the vehicle has been sitting outside for a long time, DC charging power can start well below its ideal value. On vehicles with battery preconditioning, setting the charging station as your navigation destination prepares the battery for charging and shortens the time.

Usable vs. Gross Capacity

Manufacturers sometimes quote gross (total) capacity and sometimes net (usable) capacity. Basing your calculation on usable capacity gives more accurate results; there's usually a difference of a few kWh between the two.

Real-World Examples from Turkey

Let's calculate the 20% → 80% charging scenario for a few models common in Turkey (values are approximate and vary by version):

Togg T10X (long range, ~88.5 kWh): Energy required ~53 kWh. At a DC station supporting 180 kW, about 25–30 minutes under ideal conditions; about 5 hours on 11 kW AC.
Tesla Model Y (standard range, ~60 kWh): For ~36 kWh, about 25 minutes on high-power DC; about 3.5 hours on 11 kW AC.
Renault Megane E-Tech (60 kWh): With a DC limit of around 130 kW, fast charging takes about 30–35 minutes; with 22 kW AC support, about 1 hour 40 minutes on AC — one of the fastest in its class on the AC side.

These examples highlight an important truth: two different vehicles can charge at very different speeds at the same station. The station alone doesn't determine the time.

The Relationship Between Charging Time and Cost

While calculating charging time, you can calculate cost with the same data: cost = energy required × unit price. In Turkey, as of 2026, AC unit prices at public stations are generally lower than DC; DC fast charging is priced higher because of the time advantage it offers. Charging at home on an off-peak night tariff is significantly more economical than public charging.

For a rough comparison on our 36 kWh example: at an AC station priced at 9 TL/kWh, the cost is 324 TL; at a DC station priced at 13 TL/kWh, it's 468 TL (prices are illustrative and vary by operator and period). Planned AC charging for daily use, DC fast charging for long trips — that's the most balanced strategy for most drivers.

Quick Calculation Summary

Three steps to remember for EV charging time calculation:

Find the energy: Battery capacity × state-of-charge difference (e.g., 60 kWh × 60% = 36 kWh)
Determine the actual power: Take the lower of the vehicle's limit and the station's power
Divide and add a margin: Energy ÷ power; allow ~10% for AC losses and for the slowdown after 80% on DC

Frequently Asked Questions

How long does it take to charge an EV from 0% to 100%?

It depends on the vehicle and charging type: a vehicle with a 60 kWh battery takes about 6 hours at an 11 kW AC station including losses, and about 1 hour at a 120 kW DC station due to the charging curve. In practice, however, the 0–100% scenario is rare; for daily use, the 20–80% range is both faster and healthier for battery life.

Why does DC charging slow down after 80%?

As the battery fills up, cell voltage rises, and the battery management system gradually reduces the current to protect the cells from overheating and wear. This is a protective behavior common to all electric vehicles — it's not a station malfunction.

Why does my car charge at 11 kW at a 22 kW AC station?

In AC charging, the speed is determined by the vehicle's onboard charger (OBC). Most vehicles sold in Turkey have an OBC limited to 11 kW; even if the station offers 22 kW, the vehicle can't accept more than that. Check the "AC charging power" value in your vehicle's specifications to find your ceiling.

Does charging really take longer in winter?

Yes. Because battery chemistry slows down in cold weather, the vehicle may accept below-ideal power especially during DC fast charging, and charging can take longer. If your vehicle has battery preconditioning, using it significantly improves DC charging times in winter. For overnight AC charging, the difference is negligible for most users.

Conclusion

At its core, charging time is a simple division: divide the energy you need by the actual charging power, and leave a margin for efficiency losses on AC and the post-80% slowdown on DC. Once you know your vehicle's AC and DC limits, you can predict how long you'll wait at any station with near-minute accuracy. With more than 50 locations and over 850 sockets across Turkey, you can put this calculation into practice at ADZE Charge stations — and find your nearest AC or DC charging point at adze.com.

EV Charging Time Calculator: Formula, Examples, and a Practical Table