Free EV charging time calculator: estimate charging time from battery size, charge levels, charger power, and efficiency, for any EV.
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Enter your battery capacity in kWh, your current and target charge levels as state of charge percentages, your charger power in kW, and charging efficiency, which defaults to 90 percent because about 10 percent of wall energy is lost as heat in conversion. If your car has an onboard charger limit, enter it, and the calculator caps effective power at that limit, so a 22 kW wallbox does not falsely promise faster charging for a 7 kW capped car. Energy needed is the battery share you are adding; energy drawn from the wall divides that by efficiency; charging time divides wall energy by effective charger power. The result panel also shows the same charge on Level 1 at 2.3 kW, Level 2 at 7.4 kW, and DC fast at 150 kW, so you can compare home charging against a public charger in one view. DC fast times are estimates, because real DC power tapers sharply above 80 percent and the last 20 percent takes far longer than the first 80 percent.
Charging time in hours equals energy needed divided by effective charger power, where energy needed is battery capacity multiplied by the charge share added, divided by efficiency. A worked example: a 75 kWh battery charged from 20 percent to 80 percent needs 45 kWh of battery energy, and at 90 percent efficiency it draws 50 kWh from the wall. On a 7.4 kW Level 2 charger that takes about 6.76 hours, or about 405 minutes. The same charge takes about 21.7 hours on a 2.3 kW Level 1 outlet and about 0.33 hours, or 20 minutes, on a 150 kW DC fast charger before taper. Calculators that skip the efficiency step understate time by about 11 percent, which is why this calculator shows wall energy separately from battery energy.
Step 1: enter your battery capacity in kWh from your car manual or dashboard. Step 2: enter your current charge level and target charge level; 20 percent to 80 percent is the usual daily window, and overnight charging to 100 percent suits long trips or lithium iron phosphate batteries, which tolerate full charges better. Step 3: enter your charger power in kW, and your car's onboard limit if you know it. Step 4: read the main charging time, then compare the Level 1, Level 2, and DC fast rows to decide whether home charging overnight is enough or a public fast charger is worth the stop.
Level 1 uses an ordinary household outlet at about 1.4 to 2.3 kW and adds roughly 3 to 5 miles of range per hour, so a 10 percent to 80 percent charge typically takes 24 to 50 hours for a full battery car and 5 to 6 hours for a plug-in hybrid with a small battery. Level 2 uses a dedicated home wallbox or public AC charger at 7.4 to 22 kW and adds roughly 25 to 45 miles per hour, so 10 percent to 80 percent typically takes 4 to 9 hours. DC fast charging at 50 to 350 kW adds up to 120 to 220 miles in 15 to 20 minutes and typically reaches 80 percent in 18 to 45 minutes, but power tapers above 80 percent, so charging to 100 percent on DC is slow and usually unnecessary. A plug-in hybrid, or PHEV, charges much faster than a full battery car because its battery is typically only 13 to 30 kWh.
This Level 1 vs Level 2 vs DC fast charging comparison applies to any electric vehicle, and drivers of a Tesla or any other brand use the same formula: enter that car battery size and charger power. To fully charge an electric car overnight, Level 2 charging is usually the practical choice, because Level 1 may not finish by morning for a large battery.
For a 20 percent to 80 percent charge at 90 percent efficiency, a 40 kWh battery needs about 26.7 kWh from the wall and takes about 11.6 hours on Level 1, 3.6 hours on Level 2 at 7.4 kW, and about 0.18 hours on DC fast. A 60 kWh battery needs 40 kWh from the wall and takes about 17.4 hours, 5.4 hours, and 0.27 hours on the same chargers. A 75 kWh battery needs 50 kWh and takes about 21.7 hours, 6.8 hours, and 0.33 hours. A 100 kWh battery needs 66.7 kWh and takes about 29.0 hours, 9.0 hours, and 0.44 hours. These DC figures ignore taper, so treat them as best-case estimates for the fast portion of the charge.
This battery size table lets you read your charge time at a glance without rerunning the calculator for every battery size.
Above about 80 percent, battery management systems reduce power to protect cell life, which is the charging taper, and it is why DC fast charging guides quote 10 percent to 80 percent times rather than full-charge times. Your car's onboard AC limit also caps home charging: a car limited to 6.6 or 7 kW gains nothing from a 22 kW wallbox. Temperature matters too: cold batteries charge slowly until they warm, and very hot batteries may also limit power, so winter charging times often exceed the calculator's estimate. Battery age and degradation reduce usable capacity over time, which shortens charging time slightly while also reducing range, so an older car may charge faster to the same percentage but travel fewer miles on it.
The 80 percent rule says daily charging to about 80 percent, rather than 100 percent, reduces battery stress for nickel-based chemistries, while lithium iron phosphate batteries are generally happier at 100 percent, so check your car's chemistry before adopting a rule. Charging cost is wall energy multiplied by your electricity price, so a 50 kWh wall draw at 30 cents per kWh costs 15 dollars at home, while public fast charging often costs two to four times more per kWh. The best time to charge at home is usually overnight on an off-peak tariff, often between midnight and 7 in the morning, when rates are lowest and the car sits unused for hours anyway. What kills a battery fastest is sustained heat, frequent DC fast charging, and spending long periods at very high or very low charge, not ordinary overnight Level 2 charging.
On a 7.4 kW Level 2 wallbox, a 75 kWh battery from 20 percent to 80 percent takes about 6.8 hours. On an ordinary Level 1 outlet at 2.3 kW, the same charge takes about 21.7 hours, so overnight Level 2 charging suits most daily driving.
Typically 18 to 45 minutes from 10 percent to 80 percent, depending on battery size and charger power. Charging from 80 percent to 100 percent on DC is much slower because power tapers, so most drivers stop at 80 percent on long trips.
Battery management systems reduce power above about 80 percent to protect cell life and control heat. This charging taper, or charging curve, means the last 20 percent can take as long as the first 60 percent on a fast charger.
It is the practice of charging to about 80 percent for daily use to reduce battery stress, mainly for nickel-based batteries. Lithium iron phosphate batteries tolerate 100 percent better, so follow your manufacturer's guidance for your car's chemistry.
Only if your car uses lithium iron phosphate chemistry or you need the full range next day. For most other batteries, daily charging to 80 percent preserves long-term capacity, with 100 percent reserved for long trips.
Both: the charger sets the maximum power, but your car's onboard AC limit caps home charging, and its DC acceptance limit caps fast charging. A 22 kW wallbox cannot charge a 7 kW limited car any faster than a 7 kW wallbox can.
Common reasons are your car's onboard limit, the charging taper above 80 percent, cold or very hot battery temperature, a shared charger splitting power, and the roughly 10 percent efficiency loss between wall energy and battery energy.
Divide wall energy by charger power: wall energy equals battery capacity multiplied by the charge share added, divided by efficiency. For a 75 kWh battery from 20 to 80 percent at 90 percent efficiency on 7.4 kW, that is 50 divided by 7.4, about 6.76 hours.
Cold batteries accept charge slowly until they warm, so winter charging can take noticeably longer, and very hot batteries may also limit power to protect themselves. Preconditioning the battery while plugged in, where your car supports it, reduces this penalty.
As a battery degrades, its usable capacity falls, so charging to the same percentage takes slightly less time, but range also falls. Degradation of roughly 2 to 3 percent per year has been reported for typical use, with heat and frequent fast charging accelerating it.
Not with current production cars and chargers: even a 350 kW charger needs roughly 10 to 20 minutes to add a useful highway range, and the taper above 80 percent rules out a full charge in 5 minutes. Five-minute charging remains a research goal, not a showroom reality.
Overnight on an off-peak tariff, typically between midnight and 7 in the morning, when electricity is cheapest and the car is parked for hours. Scheduling the charge to finish just before departure also leaves the battery warm in winter.
Yes: enter the smaller battery, typically 13 to 30 kWh, and the same formula applies. A plug-in hybrid, or PHEV, charges far faster than a full battery car because there is simply less energy to add.
AC charging sends alternating current to the car's onboard charger, which converts it to direct current for the battery, and is limited by that onboard charger. DC fast charging bypasses the onboard charger and feeds direct current straight to the battery at much higher power, which is why it is faster and why it tapers above 80 percent.