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Time = battery energy (kWh) ÷ charger power (kW). Example check: a 60 kWh battery on a 7 kW home charger = 60 ÷ 7 = 8.6 hours, about 8 h 34 min, for a full 0–100% charge in theory. Real charging tapers near full and loses energy to heat — this result is theoretical, and the last 20% is slower than the maths suggests.
Try an example: 60 kWh, 7 kW, 0–100%
Electric vehicles are now a common sight on the road, but one question still comes up before every journey: how long will charging actually take? The answer depends on just a few numbers, yet most drivers are left guessing between a home charger overnight and a fast charger on a motorway stop. The EV Charging Time Calculator removes that guesswork. It turns your battery size, your current charge level, your target charge level and your charger power into a clear time estimate, so you can plan departures, stops and overnight charging with confidence.
The maths behind the calculator is simple, and that simplicity is its strength. Charging time equals battery energy divided by charger power. If your battery holds a certain number of kilowatt-hours and your charger delivers a certain number of kilowatts, dividing the first number by the second gives the time in hours. A kilowatt-hour is a unit of energy, the amount stored in the battery, while a kilowatt is a unit of power, the rate at which energy flows into the battery. Keeping those two ideas separate is the key to understanding every charging estimate, because a bigger battery needs more energy and a more powerful charger delivers that energy faster.
The first input the calculator asks for is battery size, measured in kilowatt-hours. This figure describes the total usable energy capacity of the battery, and it varies widely between vehicles. A small city car may carry around 30 to 40 kilowatt-hours, a typical family car may carry 50 to 70 kilowatt-hours, and a larger long-range vehicle may carry 80 kilowatt-hours or more. You can find your battery size in the vehicle handbook, on the manufacturer specification page, or on the charging screen of the car itself. Entering the correct size matters more than any other input, because every result scales directly with it.
The second and third inputs are your current charge level and your target charge level, both entered as percentages. Most drivers rarely charge from completely empty to completely full. A typical day starts at 30 percent and ends at a target of 80 percent, or a long trip begins with an overnight charge to 100 percent. By asking for both levels, the calculator works out only the energy you actually need to add, rather than assuming a full charge every time. The difference between the two percentages, applied to the battery size, gives the energy window for the session, and that window is what gets divided by charger power.
The fourth input is charger power, measured in kilowatts, and the calculator includes presets for the chargers drivers meet most often. A standard home charger delivers around 7 kilowatts, which suits overnight charging while the car is parked for hours. A fast public charger may deliver 50 kilowatts, while a rapid charger can deliver 150 kilowatts or more, which suits a quick top-up during a long journey. Selecting a preset fills in the power figure instantly, and you can also type in a custom value if your charger delivers a different rate, such as a slower wall outlet or a newer ultra-rapid unit.
Let us walk through the worked check that shows the formula in action. Take a 60 kilowatt-hour battery charging on a 7 kilowatt home charger. Dividing 60 by 7 gives 8.6 hours, which is about 8 hours and 34 minutes, for a full charge from 0 percent to 100 percent in theory. That single example tells a driver most of what they need to know about home charging: plug in during the evening and the car is ready by morning. It also shows why charger power matters so much, because the same battery on a much faster charger would finish the same job in a fraction of the time.
Partial charges are where the calculator earns its keep day to day. Suppose the same 60 kilowatt-hour battery sits at 20 percent and you want to reach 80 percent. The energy window is 60 percent of 60 kilowatt-hours, which is 36 kilowatt-hours. On a 7 kilowatt home charger that takes 36 divided by 7, or about 5.1 hours. On a 50 kilowatt fast charger the same window takes 36 divided by 50, or about 43 minutes in theory. Seeing both figures side by side helps you decide whether to charge at home before leaving or to stop en route, and it turns a vague feeling about range into a concrete plan.
Cost is the other half of the charging question, and the calculator covers it with an editable electricity tariff. Enter the price you pay per kilowatt-hour and the tool multiplies it by the energy added to give the cost of the session. Home tariffs are usually far cheaper than public rapid charging, so the same 36 kilowatt-hour top-up can cost very different amounts depending on where you plug in. If your tariff changes at night, try entering the off-peak rate to see what overnight charging really costs, then compare it with the daytime rate. That comparison often explains why drivers who charge at home save so much over a year.
There is one honest limitation you should know about, and the calculator labels its results accordingly. The result is theoretical, because real charging tapers near full and loses some energy to heat. A battery accepts power quickly when it is fairly empty, but the charging rate falls as it approaches full, so the last 20 percent is slower than the maths suggests. Cable losses, cold weather and battery temperature management add further small delays. Treat the calculator result as a baseline for planning, then allow extra time if you need a full battery before a long trip.
Planning habits make the numbers even more useful. Charging to 80 percent for daily driving, rather than 100 percent every time, usually saves time because it avoids the slow final stretch, and it is also gentler on long-term battery health. For road trips, plan stops around the fast part of the charge curve and aim to arrive at chargers with a low but comfortable level remaining, so the charger can work at its fastest rate. Overnight, the exact finish time matters less, because the car sits idle for hours anyway, which is why a modest 7 kilowatt home charger suits most drivers well.
Drivers who compare running costs will also want to see the wider picture. An electric car charged at home often costs far less per mile than a petrol or diesel car, but the size of the saving depends on your tariff, your mileage and how often you rely on public rapid chargers. Pairing this calculator with the Electricity Cost Calculator helps you work out the monthly energy bill, while the Fuel Cost Calculator lets you compare against a conventional car on the same journeys. Together they give a numbers-based view of what switching really saves.
Planning a trip around charging stops is easier when you can estimate the driving side too. The Travel Time Calculator works out journey duration from distance and speed, so you can add realistic charging stops to the driving time and get a door-to-door estimate. If you ever need to convert miles to kilometres, kilowatt-hours to other energy units, or speeds between systems, the Unit Converter handles those conversions in seconds. Small tools like these turn a rough plan into one you can rely on.
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The EV Charging Time Calculator is free, works entirely in your browser, and needs no sign-up or download. Enter your battery size, your current and target charge levels, pick a charger power or type your own, and add your tariff if you want the cost. Use the result as a theoretical planning figure, remember that the last 20 percent runs slower in real life, and build in a small buffer for cold days and busy chargers. With that habit, you will rarely be caught out by a charging stop again.
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