Measure diagonally from corner to corner

Tablet screen size is always measured diagonally—from one corner of the screen to the opposite corner. This is the standard across every manufacturer, from Apple to Samsung to Amazon. You are measuring the visible screen area only, not the bezel (the frame around it) or the physical device itself.

To measure your tablet, use a ruler or measuring tape. Place one end at the bottom-left corner of the screen and stretch it to the top-right corner, or bottom-right to top-left—either diagonal works. Write down the measurement in inches. If your ruler shows centimetres, divide by 2.54 to convert to inches, or round to the nearest half-inch since tablet sizes are typically listed that way (7 inches, 10.5 inches, and so on).

The screen itself is the lit area you see when the tablet is on. Do not measure across the physical body of the device or include the plastic or metal frame. If you have a case on the tablet, remove it first so you are measuring only the screen.

Key Takeaways

  • Tablet screen size is measured diagonally from one corner to the opposite corner, in inches.
  • Measure only the visible screen area, not the frame or the physical device body.
  • Remove any case before measuring so the measurement is accurate.
  • If you know your tablet model, you can look up the exact screen size in the device settings or the manufacturer's specifications instead of measuring.
  • Common tablet sizes are 7 inches, 8 inches, 10 inches, and 12.9 inches, so your measurement should fall close to one of these standard sizes.

Find your screen size in device settings

If you do not want to measure, you can find the exact screen size by checking your tablet's specifications. On an iPad, go to Settings > General > About and look for "Model" or "Device Name"—the model number tells you the screen size. For example, "iPad Pro 12.9-inch" or "iPad Air 10.9-inch" is listed right there.

On Android tablets, the process varies by brand. Samsung tablets show the size in Settings > About tablet > Device name. Amazon Fire tablets list it in Settings > Device Options > Device name. If you cannot find it in settings, search online for your tablet's model number—every manufacturer publishes a spec sheet that includes screen size.

Why diagonal measurement matters

Manufacturers use diagonal measurement because it is the fairest way to compare tablets of different shapes. A 10-inch tablet might have a different width and height than another 10-inch tablet, but the diagonal distance is the same. This makes it easier to understand how much screen space you actually have.

Screen size does not tell you the resolution (how sharp the image is) or the aspect ratio (whether the screen is wider or taller). Two tablets with the same 10-inch screen can look very different depending on those other factors. But diagonal measurement is the standard way manufacturers advertise, so it is what you will see on the box and in online listings.

Common tablet sizes and what they mean

Most tablets fall into a few standard sizes. Small tablets are usually 7 to 8 inches—these are portable and fit in a large bag or backpack. Mid-size tablets are 10 to 10.5 inches, which is the most common size for reading, web browsing, and light work. Large tablets are 11 to 13 inches, often used for drawing, video editing, or as a laptop replacement.

If your measurement does not match a standard size exactly, round to the nearest half-inch. A measurement of 9.8 inches is a 10-inch tablet. A measurement of 10.2 inches is still a 10-inch tablet. Manufacturers round their advertised sizes, so your hand measurement will rarely match the spec sheet exactly—that is normal.

Measuring a tablet you do not own yet

If you are shopping for a tablet and want to know how a certain size will feel in your hands, compare it to a tablet you already own. Hold your current tablet next to the one you are considering and see how much larger or smaller it is. You can also measure your current tablet and then look up tablets that are one or two inches larger or smaller to get a sense of the difference.

Online retailers often show tablets next to common objects (like a coffee cup or a notebook) to give you a sense of scale. Reading reviews that mention how the tablet feels to hold can also help you decide whether a size will work for you. Screen size alone does not determine comfort—weight, thickness, and how you plan to use it matter too.

What if your tablet screen is cracked or hard to measure

If the screen is cracked or the bezel is damaged, measuring becomes harder but not impossible. Measure from the edge of the lit screen area to the opposite corner, avoiding any broken sections. If the damage makes it unsafe to measure or you cannot get an accurate reading, look up your tablet model online instead—this is faster and more reliable anyway.

If you have lost the original box and do not remember your tablet's model, you can often find it by looking at the back of the device. Most tablets have the model number printed or engraved on the back. Search that model number online and the manufacturer's spec sheet will show the screen size.

Frequently Asked Questions

Does the bezel size affect the screen size measurement?

No. The bezel is the frame around the screen and is not included in the measurement. You measure only the lit screen area itself. A tablet with a thin bezel and a tablet with a thick bezel can both be 10 inches if the diagonal screen distance is the same.

Why do tablets have different aspect ratios if they are the same size?

Diagonal measurement alone does not determine the width and height. A 10-inch screen can be wider and shorter, or narrower and taller, depending on the aspect ratio. Two 10-inch tablets can look quite different in shape even though the diagonal distance is identical.

Can I measure my tablet screen in centimetres instead of inches?

Yes. Measure diagonally and record the number in centimetres. Divide by 2.54 to convert to inches if you want to match the manufacturer's listing. Most tablets are advertised in inches, so converting helps you find your exact model online.

What if my measurement is between two standard sizes?

Round to the nearest half-inch or full inch. Manufacturers round their advertised sizes, so a measurement of 9.7 inches is a 10-inch tablet, and 10.3 inches is still a 10-inch tablet. Your hand measurement will rarely match the spec sheet exactly because of how the bezel is counted.

Does screen size tell me how much storage my tablet has?

No. Screen size and storage are separate specifications. A 10-inch tablet can have 32 gigabytes or 256 gigabytes of storage. You need to check the device settings or the spec sheet to find out how much storage your tablet has.