Find your tablet computer power consumption by entering your wattage, the hours a day your tablet computer runs and your electricity rate. Click Calculate and you get your cost per day, month and year along with the kWh it uses. Those same results also cover tablet computer electricity consumption.
Your tablet is one of the most frugal screens in your home, and tablet computer electricity consumption for a typical user comes to about 10.3 kWh per year, which is under two dollars on your electricity bill. This guide shows how many watts a tablet draws, what pushes its power draw up or down, and how to work out the cost to charge your own device. You will also see how an iPad, an Android tablet and a laptop compare when the daily usage is identical.
Almost everything a tablet takes from the wall goes into refilling its battery. A typical tablet carries a battery capacity of 20 to 40 watt-hours, so even a full recharge every single day moves about as much energy as running a hair dryer for one minute. That is why the tablet computer electricity consumption figure stays tiny next to the appliances that heat, cool or spin.
Here are the numbers worth remembering before you go deeper:
An iPad-class tablet behaves like every other slate with a lithium battery. While the screen is on, the device spends between 2 and 12 watts depending on what you ask of it: reading an e-book sits at the bottom of that range, while video calls and 3D games sit near the top. When the screen is off, the tablet falls to a fraction of a watt, because the processor sleeps and only the radios check in now and then.
The wall socket never sees those exact numbers. It sees the charger, which loses part of the electricity as heat. Our worked example later in this guide assumes the charger delivers 82% of what it draws, so a tablet that stores 23.2 Wh in its battery pulls about 28.3 Wh from the wall.
Tablet computers use less electricity than any other personal computer because they pair a low-power chip with a small screen and no cooling fan. To compare fairly, the table below gives each device the same 3.4 hours per day of use and the same electricity rate of 17.3 cents per kilowatt-hour. The tablet row is the charge-equivalent draw: the energy refilled into its battery each day, spread across the hours you use it. Compare with how much electricity does a blender use.
| Device | Typical power draw in use | Hours per day | Energy per year | Annual cost |
|---|---|---|---|---|
| Tablet (27.3 Wh battery) | 8.3 watts | 3.4 | 10.3 kWh | $1.79 |
| Laptop | 48 watts | 3.4 | 59.6 kWh | $10.31 |
| Desktop computer (tower only) | 118 watts | 3.4 | 146.4 kWh | $25.33 |
Add a monitor to the desktop and the gap widens, because a screen of that size often draws another 25 watts or more on its own. A gaming PC with a dedicated graphics card can climb far beyond the desktop row, which makes the tablet the lowest-consumption option in any home office.
Two tablets with the same battery can still differ in how much energy they use, because hardware and habits change the draw. These are the four levers that matter most. Related: how many watts does a table top heat sealer use.
The display is usually the biggest single consumer. A larger screen size means more pixels to light, so a 12-inch model draws more than an 8-inch one. Panel type matters as well: an LCD keeps a backlight glowing even when the picture is mostly black, while an OLED lights each pixel separately and saves energy on dark content. Turning screen brightness from full to half can cut the display's draw by a third or more, which is why brightness is the first setting to adjust.
A modern processor sips power while you read and gulps it while you edit video. Background apps that refresh feeds or sync photos wake the chip again and again, so closing the ones you do not need trims the draw without changing how you use the screen.
Radios cost energy every time they search for a signal. A tablet with weak wifi coverage keeps boosting its transmitter, and a cellular model hunting for a tower does the same. Airplane mode silences all of it, which is handy on a long flight or when you only need an offline book.
A bigger battery stores more watt-hours, but it does not raise your electricity use unless you drain and refill it more often. Charging overnight with a slow adapter wastes slightly less energy as heat than repeated fast top-ups, and a worn battery loses efficiency, so an older tablet needs more charge for the same hours of use.
The power consumption of Android tablets follows the same physics as an iPad, but the range is wider because the Android market covers everything from a basic reader to a rugged commercial slate. Budget models with a 4,000 mAh battery tend to sit at the low end, while a premium Android tablet with a high-refresh OLED panel and a 10,000 mAh battery uses more per charge. A Windows tablet PC behaves more like a small laptop, with a stronger processor and a draw closer to 15 watts in use. Compare with how much electricity does a super computer use.
Whatever the brand, check the label on the charger. It lists the output voltage and current, and multiplying volts by amps gives the maximum watts the adapter can deliver. That is a ceiling, not a typical figure, so the real draw is almost always lower.
A tablet is never truly off unless you hold the power button and shut it down. In sleep mode the screen is dark, but the radios still listen for messages and the memory stays powered, which is why the standby wattage sits around a few tenths of a watt rather than zero. Over a full day that is a handful of watt-hours, and across a year it is a similar amount of usage to a few extra charges.
The good news is that this idle usage is still very small, and it is one reason a tablet counts as a low-consumption device in the first place. If a tablet sits in a drawer for weeks, a full shutdown removes the trickle altogether. If you use it daily, sleep mode is perfectly sensible, and the energy saved by powering down each evening is too small to justify the wait at the next start-up.
To compare tablets on electricity before buying, few models carry an Energy Star badge because the programme concentrates on larger electronics. The better guide is the manufacturer's stated battery life under a fixed workload. A tablet that lasts longer on the same battery capacity uses fewer watts for the same work, so battery life tests are the closest thing to a free efficiency rating on a product page.
Electricity bills use units that sound technical, but four terms cover everything in this guide:
A tablet that draws 8 watts for 125 hours uses exactly one kilowatt-hour, which at today's rates costs less than a postage stamp.
You do not need a special calculator to estimate the cost of keeping a tablet charged. You need the battery capacity in watt-hours, how much of it you use each day, the charger efficiency and your electricity rate. The yearly energy is:
$$E_{\text{year}} = \frac{C \times u}{\eta} \times 365 \div 1000$$
and the yearly cost is:
$$\text{Cost} = E_{\text{year}} \times r$$
where \(C\) is the battery capacity in watt-hours, \(u\) is the share of the battery you drain per day, \(\eta\) is the charger efficiency and \(r\) is your electricity rate per kilowatt-hour.
Take a tablet with a 27.3 Wh battery that you drain from 100% to 15% each day, charged through an adapter that is 82% efficient, at an average residential price of 17.3 cents per kilowatt-hour. Follow these steps:
Try your own numbers: swap in your battery capacity and the rate printed on your latest electricity bill, and the same four steps give you the annual cost in under a minute.
Multiply the single-device result by the number of tablets. A family with four tablets spends about $7.15 a year charging them, and an office that keeps 40 tablets in rotation spends about $71.50, which is still less than a single mid-size space heater uses in a week.
The saving is small for one device, but the habits below also stretch battery life, which is what most owners actually care about.
Tablets sit near the bottom of the appliance league table for energy, well below a television, a console or a desktop with a monitor. For simple jobs such as email, streaming and video calls, switching from a larger device to a tablet is an easy efficiency win. The Electric Power Research Institute, a utility-funded research group, has measured iPad charging directly, which is why published figures for tablets are so much lower than those for desktops.
The carbon footprint of charging follows the same pattern. Because a tablet uses so little electricity, the emissions from refilling its battery are minor next to those of a laptop or desktop, and close to those of a smartphone, which makes sustainability a question of how much energy the rest of your devices use rather than this one.
Whatever you decide, your own savings depend on the electricity rate you pay and the hours you spend on the device. The tablet is already the cheapest screen in the house, so the real decisions sit with the bigger appliances.