EV Charging Time Calculator

Enter your battery size, charger power, and charge levels to estimate how long a charge takes.

Charging loss & vehicle limit

If your vehicle's maximum charging rate is lower than the charger's power, the lower of the two limits the speed. Above 80% charge, most vehicles slow down to protect the battery — this is modeled as roughly half power from 80% onward.

By · Energy analysts and engineers documenting every formula, source, and limitation behind our calculators.

Published Formula, sources & limitations

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HOW IT WORKS

How does the EV charging time calculator work?

The calculator converts the charge you're adding into kilowatt-hours, divides by your charger's effective power after losses, and accounts for the slower charging speed most EVs use above 80%.

1

Enter battery & charge levels

Set your battery capacity in kWh, along with the charge percentage you're starting from and charging to.

2

Enter your charger's power

Use the rated power of your charger in kW — 7.2 kW is a common home Level 2 default.

3

View your charging time

See the estimated time, energy added, and effective charging power after losses.

Why charging speed isn't constant

Two things slow a charging session down below the charger's rated power. First, some energy is lost as heat while converting power for the battery, typically 8–12% for AC home charging. Second, most EVs deliberately reduce charging power as the battery fills up — usually starting around 80% — to protect long-term battery health. This calculator applies both effects, splitting the session into a normal-speed segment up to 80% and a slower segment for any charging beyond that.

THE CALCULATIONHours = kWh added ÷ effective power (adjusted for losses and tapering)

Effective power is the lower of your charger's rating and your vehicle's maximum charging rate, reduced for losses and, above 80%, roughly halved.

Worked example: a road-trip top-up at home before an early start

EXAMPLE

A 62 kWh EV, charging from 15% to 90% on a 7.4 kW home charger

Suppose you get home at 15% charge and want to leave early the next morning at 90%, so you have a comfortable buffer for the day's driving. Your home Level 2 charger is rated at 7.4 kW, your EV's onboard charger accepts up to 11 kW (so the wall charger is the limiting factor), and charging loss is a typical 8%.

  1. Effective power after loss: 7.4 kW × (1 − 0.08) = 6.808 kW.
  2. Segment 1 (15% → 80%, normal speed): energy = 62 kWh × 0.65 = 40.3 kWh; time = 40.3 ÷ 6.808 ≈ 5 hours 55 minutes.
  3. Segment 2 (80% → 90%, tapered to half power): energy = 62 kWh × 0.10 = 6.2 kWh; time = 6.2 ÷ 3.404 ≈ 1 hour 49 minutes.

Adding the two segments together gives a total charging time of about 7 hours 44 minutes — comfortably done overnight, even though the last 10% takes almost as long as the previous 20%.

Result: about 7h 44m total, with roughly 5h 55m to reach 80% and another 1h 49m for the final stretch to 90%.

Typical charging levels compared

Charging power varies enormously by equipment type. A standard 120V household outlet (Level 1) delivers around 1.2–1.4 kW — enough for maybe 3–5 miles of range per hour, which is fine overnight for short daily commutes but slow for larger batteries. A 240V home or workplace Level 2 charger typically delivers 6–11.5 kW, adding roughly 20–40 miles of range per hour, and is the most common setup for daily home charging. Public DC fast chargers deliver power directly to the battery, typically 50–350 kW, and can add 100+ miles of range in 15–20 minutes — though your vehicle's own maximum DC charging rate, not just the charger's rating, sets the real ceiling.

What else can slow charging down

Beyond the charger's rated power and the 80% taper, a few other factors can extend real-world charging time. Cold battery temperature is one of the biggest — many EVs limit charging power until the battery warms up, which can meaningfully slow a winter DC fast-charging stop. Shared infrastructure matters too: some public fast chargers split power between two active ports, so a busy station can charge slower than its rated maximum. Battery state of health and the charging curve of your specific battery chemistry also play a role, which is why two different EV models with the same rated charger power can still charge at noticeably different speeds.

When this estimate is useful

Planning overnight charging

Check whether your home charger can comfortably reach your target charge before your next drive.

Comparing charger upgrades

See how much time a higher-power Level 2 charger or circuit upgrade would actually save.

Planning a road-trip stop

Estimate how long a DC fast-charging stop will take, so you can plan a meal or break around it.

Understanding the last 20%

See why topping up from 80% to 100% often takes nearly as long as 20% to 80%.

Privacy and appropriate use

Your inputs are processed directly in your browser and are not sent to a database. The result is a planning estimate; real charging sessions can vary with battery temperature, charger sharing, and your vehicle's specific charging curve.

Calculate your charging time ↑Also estimate the cost →
FREQUENTLY ASKED QUESTIONS

Questions about the ev charging time calculator.

Clear answers about charging speed, charging levels, and how to read the result.

How long does it take to charge an EV?

It depends mainly on your charger's power and how much range you're adding. A typical Level 2 home charger (7.2 kW) takes roughly 5–6 hours to charge a 60 kWh battery from 20% to 80%. A basic Level 1 outlet can take over a day for the same range, while a DC fast charger can often do it in under an hour.

Why does charging slow down above 80%?

To protect battery health, most EVs reduce charging power as the battery approaches full — this calculator models roughly half power from 80% to your target. This is most noticeable on DC fast chargers; Level 1 and Level 2 charging is already slow enough that the difference is less dramatic.

What's the difference between Level 1, Level 2, and DC fast charging?

Level 1 uses a standard 120V household outlet at about 1.4 kW. Level 2 uses a 240V circuit, typically 6–11.5 kW for home chargers. DC fast charging uses public high-power stations, typically 50–350 kW, delivering power directly to the battery rather than through the car's onboard AC-to-DC converter.

What limits my charging speed — the charger or the car?

Whichever is lower. A 150 kW public fast charger can't charge your car faster than your vehicle's own maximum charging rate allows, and a car capable of 250 kW won't charge any faster than a 50 kW charger's output. Enter your vehicle's maximum rate in the advanced section if you know it, and the calculator will use the lower of the two.

Why is my estimate different from what my car's dashboard shows?

Your car's onboard estimate can account for real-time factors this calculator can't see, like current battery temperature, the charging curve of your specific battery chemistry, and live communication with the charger. This calculator gives a reasonable planning estimate, not a live reading.

Does cold weather affect charging time?

Yes. In cold weather, many EVs limit charging power to protect the battery until it warms up, which can noticeably extend charging time — especially on DC fast chargers. If you're estimating a winter charging session, consider using a lower effective charger power than the rated value.

How much charging loss should I use?

For Level 1 and Level 2 AC charging, 8–12% is a reasonable range. DC fast charging tends to have lower losses, often 3–6%, since it bypasses much of the onboard AC-to-DC conversion. The default of 10% is a reasonable starting point for home charging.

Can I use this for public DC fast charging?

Yes — enter the charger's rated power (or your vehicle's maximum DC charging rate if lower) and a lower charging-loss percentage. Keep in mind that real DC fast-charging curves taper more gradually than the simple 80% cutoff modeled here, so treat the result as a reasonable estimate rather than an exact figure.

Is my data stored?

No. All inputs and calculations run directly in your browser and are not sent to a server or saved in an account. General site usage may be measured through Google Analytics as described in our Privacy Policy.