How long does it take to charge an EV?

The short answer (the three factors)

EV charging time depends on three things: battery size, charger power, and how much charge you are adding. Roughly, time equals the kWh added divided by the charger kW. A home Level 2 charger typically fills a battery overnight; DC fast-charging can reach 10–80% in 20–40 minutes. Real-world charging is slower than the rated figure because charging slows as the battery fills — which is why the last 20% takes disproportionately long.

That is the whole verdict in one line: kWh added ÷ effective charger power. Battery size only matters because it sets how many kWh a given percentage represents, and the "effective" power is a little below the charger's nameplate rating because some energy is lost converting AC to DC for the battery — commonly about 10–15% on AC charging, a charge efficiency near 0.88. If you would rather skip the arithmetic, our EV charging time calculator does it for any battery, charge window and charger power.

Charging levels explained (L1 / L2 / DC)

The single biggest lever on charge time is which level of charger you plug into. There are three, and they differ by more than an order of magnitude in power.

• Level 1 uses a standard 120 V household outlet at about 1.4 kW. It is slow — fine for a plug-in hybrid or for a few miles of daily driving topped up overnight, but it can take more than a day to fill a depleted long-range battery.
• Level 2 runs on a 240 V circuit (a home wall box or most public destination chargers) at roughly 7–11 kW. This is the workhorse of EV ownership: it refills a normal day's driving in a couple of hours and tops most cars up overnight.
• DC fast charging delivers 50–350 kW and bypasses the car's onboard AC charger to feed the battery directly. It is built for road trips, adding most of a charge in the time it takes to get a coffee.

The table below shows roughly how long each level takes to add 42 kWh — a 20% → 80% top-up on a typical 70 kWh battery — using a charge efficiency of about 0.88 and an EV efficiency near 3.5 mi/kWh.

The math: kWh added divided by charger power

The core formula is deliberately simple:

energy_added = battery_kwh × (target_soc − start_soc) / 100
charge_time  = energy_added / (charger_kw × charge_efficiency)

We divide by a charge efficiency because the power reaching the cells is a little below the charger's rating — AC charging commonly loses about 10–15% to heat in the conversion, so we use roughly 0.90 for AC. To turn the result into range, multiply the kWh added by your car's efficiency: at 3.5 mi/kWh, 42 kWh is about 147 miles.

Notice what is not in the formula: the battery's total size. A bigger pack only lengthens the charge because a given percentage is more kWh. Two cars charging 20% → 80% at the same charger finish together only if their batteries are the same size.

Why real-world charging is slower than rated (the charging curve)

The formula above assumes a constant charging rate. That holds well for Level 1 and Level 2, where the onboard charger pulls a steady power. It does not hold for DC fast charging.

To protect the battery, the car follows a charging curve: it accepts high power when the pack is nearly empty, then deliberately tapers the power as the state of charge climbs — most sharply above about 80%. That is why fast-charging is almost always quoted as a 10–80% time of roughly 20–40 minutes, and why the last 20% can take as long as the entire 10–80% leg. On a road trip, the efficient move is to unplug around 80% and drive to the next stop rather than wait out the slow tail.

Time to add a given range

Often the question is not "how long to a full battery" but "how long to add the range I need." For that, work in miles per hour of charging:

charging_speed_mph = ev_efficiency_mi_per_kwh × charger_kw × charge_efficiency
time = miles_needed / charging_speed_mph

At 3.5 mi/kWh and a 7.4 kW Level 2 charger at 0.90 efficiency, that is about 23 miles of range per hour. So adding 100 miles takes a little over four hours on Level 2 — but only a few minutes at a 150 kW DC charger, where the same math gives hundreds of miles per hour while the battery is below 80%. If you also want to know what that charge costs, our sibling guide on the cost to charge an electric car walks through the per-mile numbers, and home vs public EV charging cost compares charging at home against paying public rates.

Estimate your charge time

Here is a worked example run through our calculator. Take a 70 kWh EV charging from 20% to 80% on a 7.4 kW Level 2 charger, at 90% charging efficiency and 3.5 mi/kWh:

• Energy added: 70 × (80 − 20) ÷ 100 = 42 kWh
• Charge time: 42 ÷ (7.4 × 0.90) = 42 ÷ 6.66 ≈ 6.3 hours (about 6h 18m)
• Range added: 42 × 3.5 = 147 miles, at roughly 23 mi/h
• Full 0–100% on the same charger: ≈ 10.5 hours

To see how that compares across system sizes and charger levels, the same 42 kWh runs in about 34 hours on a 1.4 kW Level 1 outlet, about 4.3 hours on an 11 kW high-power Level 2, and well under an hour at a 50 kW DC charger (constant-rate) — the spread that makes home charging an overnight habit and fast charging a road-trip tool.

Try the EV charging time calculator → — enter your own battery, charge window and charger power to see the time, energy and range you'll add.

The bottom line

Charge time comes down to one formula — kWh added divided by effective charger power — and one caveat: above 80% the battery slows itself down. For everyday driving, a Level 2 charger refilling overnight is more than enough; for road trips, plan around a 20–40 minute DC fast 10–80% stop rather than a full charge. Plug your real numbers into the EV charging time calculator to get a figure tailored to your car and charger.