Where to find your monitor's dimensions
Your monitor's dimensions are listed in three places: the original box it came in, the manufacturer's website, and the back or underside of the monitor itself. The easiest route is usually the back — most monitors have a sticker or label with model number and basic specs printed directly on the plastic housing.
If you no longer have the box, search for your monitor's model number online. The model number is printed on that back label and looks something like "Dell S2721DGF" or "LG 27UP550". Type it into Google along with the word "specifications" and you will find a product page with exact dimensions listed in inches or centimeters.
If the label is worn or missing, measure the monitor yourself with a tape measure or ruler. Measure from the outermost edge on the left to the outermost edge on the right for width, from the very top to the very bottom for height, and from the front glass to the back of the stand for depth. Write these numbers down — you will need them if you are shopping for a desk, wall mount, or monitor arm.
Key Takeaways
- Monitor dimensions come in three measurements: width (left to right), height (top to bottom), and depth (front to back including the stand).
- The quickest way to find dimensions is the sticker on the back of the monitor or the original box, which lists the model number and specs.
- If you cannot find a label, search the model number plus "specifications" on the manufacturer's website to get exact measurements.
- Depth matters most when planning desk space — a monitor with a tall stand takes up more room than one with a short base or wall mount.
- Measure your own monitor if you need to know the exact footprint it takes up on your desk right now.
Understanding the three measurements
Width is how far the monitor stretches from left edge to right edge. This is the number that matters most when you are deciding whether it fits on your desk or in a specific space. A 24-inch monitor is roughly 21 inches wide, a 27-inch monitor is roughly 24 inches wide, and a 32-inch monitor is roughly 28 inches wide. The inch measurement refers to the diagonal of the screen itself, not the width of the whole unit.
Height is measured from the top of the monitor to the bottom, including any bezel (the plastic frame around the screen) and the stand. This matters less for desk space than width does, but it becomes important if you are mounting the monitor on an arm or wall and need to know how much vertical clearance you have. Most monitors are between 14 and 20 inches tall depending on the screen size and stand design.
Depth is how far the monitor sticks out from your desk toward you, measured from the front of the screen to the back of the stand. This is where people often get surprised — a monitor with a large stand can take up 7 to 10 inches of desk depth, while a monitor on a wall mount or small arm takes up almost none. If your desk is shallow or you have limited space behind it, depth is the measurement that will make or break your setup.
Why monitor dimensions matter for your desk setup
Knowing your monitor's width and depth tells you whether it actually fits in the space you have. A 27-inch monitor looks small in a store but takes up a real footprint on a desk — roughly 24 inches wide and 7 to 9 inches deep with a standard stand. If your desk is 48 inches wide and you also have a keyboard, mouse, and other items on it, that monitor is taking up half your usable surface.
Depth becomes critical if you have a shallow desk, a desk against a wall, or limited space behind your monitor. A monitor with a tall stand can stick out 8 to 10 inches. If you swap it for a monitor arm or wall mount, you reclaim that space when ready. This is why people often measure depth first — it is the constraint that forces a choice between a different monitor, a different stand, or a different desk arrangement.
Height matters when you are stacking monitors or mounting them on an arm. If you want two monitors side by side and they are different heights, the bezels will not line up and your eyes will have to track across a visible step. If you are mounting a monitor on an arm, you need to know the height to position it at eye level — too high or too low causes neck strain over a full workday.
How to measure your monitor yourself
Use a tape measure or ruler and measure from the absolute outermost edge on one side to the absolute outermost edge on the other. For width, this means the leftmost plastic to the rightmost plastic. For height, measure from the very top of the bezel to the very bottom of the stand. Do not measure just the screen — measure the entire unit as it sits on your desk.
For depth, place the tape measure flat on your desk and measure from the front edge of the monitor (where the glass begins) straight back to the farthest point of the stand. If your monitor has an adjustable stand that tilts or swivels, measure it in the position you actually use it in — the depth can change slightly depending on the angle.
Write down all three numbers and note whether you measured in inches or centimeters. If you are shopping for a mount or arm, convert to the same unit the product listing uses — most US retailers list in inches, while international sites often use centimeters.
Finding dimensions for older or uncommon monitors
If your monitor is very old or a brand you do not recognize, the manufacturer's website may no longer have the product listed. In that case, search for the model number on sites like Amazon, eBay, or Newegg — even if the monitor is no longer sold, the old listing often has the original specs in the product description.
If you cannot find the model number or the monitor is completely unmarked, measuring it yourself is your only option. Take a photo of the back label if there is one, in case you need to reference it later. Keep those measurements in a note on your phone or computer — you will need them if you ever buy a monitor arm, wall mount, or new desk.
For monitors built into all-in-one computers or laptops, dimensions are usually listed on the manufacturer's support page under the model number. Search "[your computer model] specifications" and look for the display dimensions section.
Dimensions versus screen size — why they are different
A monitor's screen size (measured in inches diagonally) is not the same as its width or height. A 24-inch monitor has a diagonal screen measurement of 24 inches, but the actual width is closer to 21 inches because of the bezel. A 27-inch monitor is about 24 inches wide. This is why you cannot assume a monitor will fit based on the screen size alone — you need the actual width and depth.
The bezel — the plastic frame around the screen — adds an inch or two to the overall width and height. Newer monitors have thinner bezels, so a modern 27-inch monitor may be slightly narrower than an older 27-inch model. This is another reason to measure or look up the exact specs rather than guessing based on screen size.
Using dimensions when you shop for a monitor
When you are looking at a new monitor, check the dimensions before you check the price. Write down the width and depth of your current setup, then compare it to the monitor you want to buy. If the new monitor is wider or deeper, make sure you have the space for it. If it is narrower or shallower, you will have more room on your desk.
Most online retailers list dimensions in the specifications section, usually near the weight and warranty information. If the listing does not include dimensions, contact the seller or check the manufacturer's website. Never buy a monitor without knowing whether it will physically fit in your space — returning it is a hassle, and you may be charged a restocking fee.
Frequently Asked Questions
What does the diagonal measurement mean on a monitor?
The diagonal measurement (like 24 inches or 27 inches) is the distance from one corner of the screen to the opposite corner, measured through the glass. It does not tell you the width or height. A 27-inch monitor is roughly 24 inches wide and 14 inches tall, but those numbers vary slightly by brand and model.
Does the stand affect the dimensions I should know about?
Yes. The depth measurement includes the stand, so a monitor with a large stand takes up more desk space than one with a small stand or no stand at all. If you plan to use a wall mount or monitor arm instead of the included stand, you can ignore the stand depth and measure just the monitor itself.
Where is the model number printed on a monitor?
The model number is almost always on a sticker on the back of the monitor, usually near the bottom. It may also be on the underside of the base or inside the battery compartment if the monitor has one. The model number looks like "Dell S2721DGF" or "LG 27UP550" and is your key to finding exact specifications online.
Can I use monitor dimensions to figure out if it will fit my desk?
Yes. Measure your desk width and depth, then compare those numbers to the monitor's width and depth. Make sure the monitor is narrower than your desk and does not stick out so far that it blocks your movement or leaves no room for a keyboard. Leave at least a few inches of clearance on each side.
What if my monitor dimensions are listed in centimeters but my desk is measured in inches?
Divide the centimeter measurement by 2.54 to convert to inches. A monitor that is 61 centimeters wide is roughly 24 inches wide. Most online converters can do this when ready if you search "centimeters to inches".