EV Charging Time Calculator

Enter your battery's usable kWh, where the charge starts and ends, and the charger. You get the time in hours and minutes with charging losses counted, the energy you will actually pay for at the meter, and the DC slowdown past 80 percent modeled instead of ignored.

Battery usable capacity (kWh) (mainstream EVs carry roughly 60 to 80 kWh usable; the window sticker or spec sheet has yours)

Charge now (%) (where the pack is when you plug in)

Target (%) (80 is the road-trip habit: DC charging slows sharply past it)

Charger

Electricity price per kWh (optional; home averages about $0.18, DC fast networks about $0.45 to $0.53)

Your EV's miles per kWh (3.4 is typical and matches our EV savings page's 0.29 kWh per mile; blank it to skip the range line)

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How the EV charging time calculator works

Every charging question on the internet is secretly the same confusion, so let us clear it first: kW is speed, kWh is amount. A kilowatt-hour is a bucket of energy; a kilowatt is how fast energy flows. Your battery holds kWh, your charger delivers kW, and charging time is simply the one divided by the other. A 60 kWh battery on an 11 kW charger is a bathtub and a tap: the tub holds a fixed amount, the tap pours at a fixed rate, and the fill time follows from both. Once that clicks, every number on a spec sheet starts making sense, and most of the arguments in EV forums evaporate.

Two honest corrections make the simple division trustworthy. First, losses: not every kWh you pay for reaches the battery. On AC (Level 1 and Level 2) the car's onboard charger converts wall power to battery power and sheds heat doing it; published measurements put Level 2 at roughly 85 to 90 percent efficient and Level 1 closer to 80. DC fast chargers do the conversion in the cabinet and land around 93 percent. We apply the right figure per charger class and show you both numbers: what the battery gains and what the meter sells you. Second, the taper: a DC session does not run at the plug's rated power the whole way. We model it plainly, full accepted rate to 80 percent and half rate above, and we say so in the steps rather than hiding a curve you cannot check.

The formula

energy needed = (target% − current%) × capacity ÷ 100
meter energy = energy needed ÷ efficiency
rate = min(plug kW, car's max acceptance) on DC; plug kW on AC
time to 80% = energy below 80 ÷ (rate × efficiency)
time above 80% (DC) = energy above 80 ÷ (rate × efficiency × 0.5)

Capacity is your battery's usable kWh. Efficiency is the share of paid-for energy that reaches the pack: 0.80 on Level 1, 0.88 on Level 2, 0.93 on DC fast, per the sources below. The min() is the sentence most worth reading twice: on DC, the session runs at whichever is smaller, the plug's rating or your car's maximum acceptance rate. A car that accepts 150 kW gains nothing from a 350 kW plug.

Worked example

A 75 kWh battery from 20 to 80 percent: the window is 60 percentage points, so 45 kWh has to reach the pack.

At home on an 11 kW Level 2 charger: at 88 percent efficiency the meter supplies 45 ÷ 0.88 = 51.1 kWh and the pack gains 11 × 0.88 = 9.68 kW per hour, so the session takes 45 ÷ 9.68 = 4 h 39 min. At the $0.18 home average that is $9.20, and at 3.4 miles per kWh it adds about 153 miles of range. Plug in after dinner, and the car is done before the late news.

On the road at a 150 kW DC plug, in a car that accepts 150 kW: plug and car are matched, so 150 × 0.93 = 139.5 kW reaches the pack and the same 45 kWh takes 19 min, with the dispenser billing about 48.4 kWh. Push on to 100 percent and the taper bites: the last 20 points are 15 kWh at half rate, 13 min more for a third of the energy, about 32 min in all. That arithmetic is the whole reason road trippers unplug at 80.

Why the fast window ends at 80 percent

A lithium battery accepts charge the way a parking garage accepts cars: when it is nearly empty, anyone can find a spot at speed; when it is nearly full, every arrival has to hunt. Past about 80 percent state of charge the battery management system winds the current down to protect the cells, no matter how mighty the plug is. Our model states this simplification outright: full accepted rate to 80, half rate above. Real charging curves step down gradually rather than at one clean breakpoint, and they differ by car. Some hold a high plateau (an Ioniq 5 holds near 233 kW across a wide band), while others spike and fade (a Model 3 touches its 250 kW peak only briefly and averages closer to 107 kW over a 10 to 80 session). So treat our DC times as the honest best case at the rated rate: plateau cars land close to them, peaky cars run somewhat longer.

The other limit is the one buyers forget at the charging station: the car sets its own ceiling. The plug's number is an offer, not a promise, and the session runs at whichever is lower, the plug or the car. Enter your car's maximum DC rate above and the calculator names the bottleneck for you. There is no shame in it; a 55 kW car at a 350 kW station charges at exactly the speed it would at a 55 kW station, and knowing that saves you paying premium-plug prices for nothing extra.

The overnight arithmetic that makes Level 2 boring, in the best way

Here is the calculation that settles most home-charging anxiety. Our EV savings page uses 12,000 miles a year as its default, which is about 33 miles a day, and at a typical 0.29 kWh per mile that is roughly 10 kWh of battery. An 11 kW Level 2 charger replaces it in about an hour; even the 32 A unit does it in about an hour and a half; and a whole 20 to 80 fill from a road trip finishes overnight with hours to spare. Level 2 does not need to be fast, because your car sleeps eight hours a night and your driving day fits in one of them. Level 1 is the outlier: at 1.4 kW and about 80 percent efficiency, that same daily 10 kWh takes around nine hours, workable for short commutes, hopeless for catching up after a long weekend.

Two closing honesty notes. Cold matters: a cold battery accepts less power, which is why winter DC stops run slower and why many EVs precondition the pack (warming it on the way to a fast charger) to protect the speed you are paying for. And this page deliberately prices only the session in front of you; for what charging costs per mile against gasoline over a year of driving, the EV savings calculator owns that math, with the same efficiency assumptions, so the two pages will never tell you different stories.

Sources

Where the numbers on this page come from. We go to the body that publishes the figure, not to another calculator. See how we verify.

What is a Level 2 EV Charger? (Home Charging Guide), Qmerit. The charger class power figures: Level 1 on a 120 V outlet delivers about 1.4 kW at 12 A; Level 2 at 240 V delivers about 7.7 kW at 32 A and up to 11.5 kW at a hardwired 48 A.
Level 1 vs Level 2 vs Level 3 Charging Explained, Recharged. Corroborates the class tiers: Level 1 roughly 1 to 2 kW, home Level 2 installations clustering at 7.7 and 11.5 kW, and DC fast plugs rated 50 to 350 kW.
Is your EV battery getting all the energy you pay for?, Recurrent. The efficiency figures used here: studies put Level 1 at 75 to 84 percent (average about 80), Level 2 at about 89 to 95 percent, and DC fast charging near 93 percent at ambient temperature. Also the AC versus DC shape: DC charging slows as the battery fills while AC holds essentially consistent, and cold packs accept less power.
A comparison of electric vehicle Level 1 and Level 2 charging efficiency, IEEE (2014 conference publication). The peer-reviewed anchor for the AC split: measured Level 2 efficiency of 89.4 percent versus Level 1 at 83.8 percent, with Level 1 dropping to about 75 to 80 percent at lower amperages.
How Efficient Is Each Type Of EV Charger?, InsideEVs. Corroborates the loss figures with real-vehicle tests: around 15 percent average losses on Level 2 AC (a Model Y measured 14 percent) and roughly 10 percent on DC fast charging.
Tesla Model 3 vs Hyundai Ioniq 5: The Tesla Supercharger Test, InsideEVs. The charging-curve honesty: a Model 3 touches its 250 kW peak only briefly and averages about 107 kW over a 10 to 80 percent session, while an Ioniq 5 holds a plateau near 233 kW. Why our full-rate-to-80 model is a best case that plateau cars approach and peaky cars run behind.
2026 Fastest Charging EVs, Recurrent. The car-acceptance examples in the field hint: mainstream EVs peak roughly 100 to 250 kW DC (Model 3 near 250, Ioniq 5 near 235, an older Bolt around 55), and charging tapers above 80 percent state of charge.

Frequently asked questions

How long does it take to charge an EV at home?

For a typical 75 kWh battery from 20 to 80 percent, about 4 hours 39 minutes on an 11 kW Level 2 charger and about 6 hours 38 minutes on a 32 A (7.7 kW) unit, losses counted. The more useful frame is daily: an average driving day of about 33 miles needs roughly 10 kWh, which Level 2 replaces in an hour or two. Overnight, the charger's speed almost never matters.

Why does charging slow down after 80 percent?

Because a nearly full lithium battery cannot safely accept charge as fast as a nearly empty one, so the car's battery management system winds the current down to protect the cells. This page models that plainly: full accepted rate to 80 percent, half rate above, and it says so in the steps. In our worked example the last 20 percentage points take 13 minutes against 19 for the first 60, which is why road trippers unplug at 80 and drive on.

Can any EV use a 350 kW charger?

Any EV with the right connector can plug in, but the session runs at the car's own maximum acceptance rate, not the plug's rating. A car that accepts 150 kW charges at 150 on a 350 kW plug, exactly as it would on a 150 kW plug. The plug's number is an offer, not a promise, and this calculator names which side is the bottleneck for your inputs.

Why does my car draw more electricity than the battery gains?

Charging losses. Converting wall AC power to battery DC power sheds heat in the onboard charger and cables, so on Level 2 only about 85 to 90 percent of what the meter sells reaches the pack, and Level 1 runs closer to 80 percent. DC fast charging converts in the cabinet and lands near 93 percent. This page shows both figures, the energy the battery gains and the energy you pay for, because your bill is based on the second one.

Is Level 1 charging too slow to be useful?

Not for everyone. At about 1.4 kW and roughly 80 percent efficiency, a wall outlet restores around 4 miles of range per hour, so an average 33-mile driving day takes about nine hours: workable if the car sleeps at home every night and your commute is modest. What Level 1 cannot do is catch up. A 20 to 80 fill of a 75 kWh pack takes about 40 hours, so one long weekend puts you behind for days.

Does cold weather make charging slower?

Yes. A cold battery accepts less power, so winter DC fast sessions run visibly slower than the times on this page, which assume a warm pack. Many EVs precondition the battery, warming it while you navigate to a fast charger, precisely to protect the charging speed. Home AC charging is affected less, though some energy goes to warming the pack instead of filling it.

How much does a charging session cost?

Enter your price per kWh above and the calculator prices the session, applying the price to the energy you actually pay for, losses included. Our worked example's home session is about $9.20 at the $0.18 national average, and the same energy at a DC fast network's 45 to 53 cents runs $22 to $26. For the bigger question, what charging costs per mile against gasoline over a year, our EV savings calculator owns that math with the same assumptions.