The quickest way to find your monitor size

Monitor size is measured diagonally across the screen in inches, from one corner to the opposite corner. The easiest way to find yours is to look at the back or underside of the monitor for a label or sticker — it usually lists the screen size along with the model number. If there is no label, you can measure the screen yourself with a ruler or tape measure, measuring from the bottom-left corner to the top-right corner of the actual display area (not including the black border or frame).

If you cannot access the back of the monitor or prefer not to measure, you can find the size through your computer's settings or by looking up the monitor model number online. The model number is often printed on the front bezel, the back panel, or the underside of the monitor stand.

Key Takeaways

  • Monitor size is always measured diagonally in inches, from corner to corner of the screen itself.
  • The quickest source is a label on the back or underside of your monitor, which usually shows the model number and screen size together.
  • You can measure the screen yourself with a tape measure if no label is visible, measuring only the display area and not the frame.
  • If you know the model number, searching it online will show the screen size and other specifications.
  • Common monitor sizes are 21.5, 24, 27, 32, and 34 inches, though many other sizes exist.

Finding the label on your monitor

The manufacturer's label is the most reliable source. On most monitors, this label is on the back panel, usually near the power cord or input ports. Look for text that says the screen size followed by a quotation mark or the word "inch" — for example, "24"" or "27 inch". The label may also list the model number, which you can use to search for more details if needed.

Some monitors have the size printed on the underside of the stand or base instead. If you have a monitor on an adjustable arm or wall mount, the label might be on the monitor itself rather than the stand. Take a moment to look at all sides before measuring.

Measuring your monitor yourself

If there is no visible label, you can measure the screen with a ruler or tape measure. Place the ruler at the bottom-left corner of the screen (where the display actually begins, not the plastic frame) and measure diagonally to the top-right corner. Write down the measurement in inches. If you get a measurement like 23.8 inches, that monitor is typically sold and referred to as a 24-inch monitor — manufacturers round to the nearest whole number for marketing.

Be careful to measure only the display area itself. Do not include the black border, plastic bezel, or frame around the screen. The measurement should go from the actual lit portion of the screen to the opposite corner. If you are measuring a curved monitor, measure along the curve from corner to corner.

Looking up your monitor model number online

If you can see the model number but not the size, you can search for it online to find the specifications. The model number is usually printed on the front bezel (the plastic border around the screen), on the back panel, or on the underside of the stand. It often looks like a combination of letters and numbers — for example, "Dell U2720Q" or "LG 27UP550".

Type the model number into a search engine along with the word "specifications" or "specs". The manufacturer's website or product pages on retailer sites will show the screen size along with resolution, refresh rate, and other details. This method also works if you are trying to find information about a monitor you no longer have access to measure.

Understanding monitor size categories

Monitors come in a range of sizes, and knowing the common sizes can help you understand what you are looking at. Smaller monitors are typically 21.5 to 24 inches and are common for office work and everyday computing. Mid-range monitors are 27 to 32 inches and are popular for gaming, photo editing, and general use. Larger monitors are 34 inches and above, often ultrawide models that provide extra horizontal space.

The size you have affects how much screen space you have for windows and programs. A 24-inch monitor shows less content at once than a 32-inch monitor, but it also takes up less desk space. If you are considering a new monitor, knowing your current size helps you decide whether you want something similar or want to go larger or smaller.

What to do if you cannot find the size

If the label is worn away, the model number is not visible, and you cannot measure the screen, you have a few other options. You can contact the monitor manufacturer directly with a photo of the monitor — they can often identify it from the design. You can also post a photo on a technology forum or subreddit where people familiar with monitor models can help identify it.

Another approach is to look at the monitor's input ports and overall design. Certain monitor types — like older CRT monitors, flat-panel office monitors, or gaming monitors — tend to come in specific sizes. If you can narrow down the brand and general type, you may be able to find the size through process of elimination.

Frequently Asked Questions

Does the monitor size include the frame or bezel?

No. Monitor size is always the diagonal measurement of the display area only — the part that actually lights up and shows your image. The plastic frame or bezel around the screen is not included in the measurement.

Why do monitors say 23.8 inches but are called 24-inch monitors?

Manufacturers measure the actual display size precisely, but round it to the nearest whole number for marketing and naming. A monitor with a 23.8-inch diagonal is sold as a 24-inch monitor because that is the standard size category it falls into.

Can I measure my monitor with my phone instead of a ruler?

Yes. Most phones have a built-in measure app (Measure on iPhone, Google Measure on Android) that can estimate distance using the camera. Point it at the screen corners and let the app calculate the diagonal. The result may be slightly less accurate than a physical ruler, but it works in a pinch.

Is the monitor size the same as the resolution?

No. Size is the physical diagonal measurement in inches. Resolution is the number of pixels displayed — for example, 1920 by 1080 or 2560 by 1440. A 24-inch monitor can have different resolutions, and monitors of different sizes can share the same resolution.

What if my monitor is mounted on the wall or an arm?

The size is still the same. Measure the screen itself the same way you would for a monitor on a stand — diagonally from corner to corner of the display area. The mounting method does not change the screen size.