How to find out the diagonal of a computer and laptop monitor

Good day, friends. Today, I will tell you how to find out the monitor diagonal in several accessible and understandable ways for everyone. On the one hand, this seems like a trivial question, but on the other, I personally have heard more than once from my acquaintances and friends about a request to determine the diagonal of a computer or laptop monitor. Therefore, I decided in this article to tell you everything in more detail so that you no longer have such questions.

Important nuance! The diagonal size of the monitor is measured only in inches, remember this.

The very first way to determine the diagonal will be incredibly simple. And it consists of examining the documentation that came with your monitor. Examine it carefully, and I can give you an almost 100% guarantee that in addition to the model of the monitor itself, its diagonal will also be indicated.

If you bought the monitor used, or simply threw away the documentation for it, then skip this step and move on to the second point.

Method number 2. Carefully inspect the surface of your monitor, especially its corners and the inscription in the middle of the bottom bar; often the manufacturer marks their products and indicates the diagonal immediately after the letter designation in the form of 2 numbers.

If there are no inscriptions on the front panel of the monitor or they are worn out, then carefully inspect the back; there is almost always an information sticker there.

Method number 3. Go to Yandex.Market in the Computers - Monitors section and enter the model of your monitor in the search bar. Click the Find button and look at the technical characteristics of the device in the search results.

Usually the type of monitor and its diagonal are in the first lines of the characteristics.

Method number 4. In my opinion, the most reliable and time-tested method. If you do not have documentation for the monitor, there are no stickers or signs on the device itself, and Yandex.Market does not search for your model, the only 100% option for determining the diagonal of the monitor is to measure it using a regular ruler or tape measure.

Take a ruler in your hands (a tape measure is more convenient) and from the lower left corner of the monitor, measure the distance to the upper right corner (you can do it the other way around). Divide the result in centimeters by 2.54.

1 inch = 2.54 cm.

Important! Measurements only need to be taken of the monitor screen itself (without the bezel).

A ruler from the lower left corner to the upper right will show in centimeters, if you need inches, then simply divide the centimeters by 2.54, since 1 inch = 2.54 cm.

For example, I got it like this:

Diagonal in centimeters = 58

In inches - 58/2.54 = 22.83, that is, mine is 23 inches.

That's all friends. You already know for sure how to find out the diagonal of your monitor, so share the information with other users, you need to help everyone.

That's all, until new interesting meetings.

Posted by: December 17, 2018

It doesn't matter if you have a PC, a laptop, or any other device that runs Windows, it most likely has a screen. This could be a monitor, a laptop or tablet display, or even a TV screen. Have you ever thought about what resolution your screen has? Do you want to learn how to find the resolution of your screen? If yes, read this article and learn seven ways to get the answer to your question.

Find out your screen resolution by visiting the web page (For all versions of Windows)

This method can be considered the simplest, but it may not be suitable for some computer configurations. All you need to do to find out your screen resolution online is open your favorite web browser and visit a page that automatically recognizes your screen resolution. A good example of such a page is whatsmyscreenresolution.com. When you go to it, the first thing you will see is the screen resolution that is recognized by the web page.

A way to find out screen resolution using a web page

Find out the diagonal of the device

There are several options with which you can easily determine the diagonal of your monitor.

Manual metering

The manual measurement method is simple and obvious, as it suggests itself from the above definition of the term “Screen diagonal”. To take measurements you will need a ruler, measuring tape or tape measure. How to take measurements is reflected in the image below.

Display diagonal measurement

Measurements should be taken carefully to prevent scratches on the surface of the screen. The resulting length value in centimeters is sufficient to divide by the conversion factor of 2.54 to obtain the value in inches. For example, 29.6 cm = 11.65″.

Documents and box

The second method of solving the problem is to refer to documents, brief information in the form of a sticker on the box or laptop case. As a rule, the manufacturer supplies devices with accompanying documentation, where you can see the dimensions of the monitor along with other characteristics.

Sticker on the case/box

The figures above and below show the characteristics of the laptop, including the diagonal length of interest to the user.

Documentation page

Internet request

If the box and documents are not at hand, or the sticker with the characteristics on the device body is missing, then access to the global network may be useful in solving the problem. It is enough to enter a query with the name of the laptop model into the search bar, for example, “Prestigio Smartbook 116C”.

Online stores, when presenting product items, always provide the characteristics of device models. So on the presentation page of the product in the list of characteristics, the user will definitely find the screen sizes of the laptop of his model.

Device settings

Third party programs

There are a number of utilities (Everest, Aida, Astra and others) with which you can determine the characteristics of the device, including its display parameters. The Aida64 program is distinguished by its good information content and ease of use, which can be downloaded from the official website of the developer. For the first 30 days, the program’s functionality can be used for free.

After installing and launching the application, to obtain the required information, just go to the “Display” section, where you open the “Monitor” menu item. The left window of the program will display all the technical information about the laptop screen, as in the image below, for example.

Obtaining information using the program

Using the AIDA64 program

If you don’t have a ruler at home, you can use software. Install the AIDA64 program on your laptop. This program scans the computer and displays all technical characteristics, including display diagonal. AIDA64 is a paid utility, but demo access is available for 30 days. A month is definitely enough to do the following:

  1. Launch AIDA64. Go to the "Display" tab and select "Monitor".
  2. In the “Monitor type” line, look at the size in inches.

The window will also contain a number of useful information: aspect ratio, maximum resolution, frame rate, even release date. Therefore, in terms of information content, there is nothing better than the AIDA64 program.

Other display characteristics

Comfort of use and image quality also depend on other important parameters:

  • monitor aspect ratio;
  • screen matrix resolution;
  • brightness and color;
  • pixel density per inch;
  • screen surface type.

Setting display options

These and other parameters can be found in the accompanying documentation for the laptop, via an online request, or using the utility described above. Some information about the monitor can be found using the built-in information service of the Windows OS system. Individual settings are also configured here.

The content of the article:

How to find out the diagonal of a computer monitor?

One of the most important parameters for users that characterizes any screen, be it a mobile phone or a computer monitor, is its diagonal. And since the screen, in most cases, is a rectangle, the diagonal is the line that connects its opposite corners and, in relation to screens, is measured in inches. Sometimes there are non-standard shapes, for example, a circle or an oval. Then the diagonal is taken to be the line passing between the most distant opposite points.

* Inch is a unit of measurement of length. Most often, the American system of measure is implied and, translated into the usual metric system, it is equal to 2.54 centimeters. Indicated by the icon “.

The most common standard values ​​are:

— Monitors – 17”, 19”, 21”, 23”.

— TVs – 32”, 43”, 49”, 50”, 55”, 65”.

— Mobile phones and smartphones – 4”, 4.5”, 5”, 5.5”.

— Laptops – 13.3”, 15.6”, 17”, 19”.

* Some manufacturers can be cunning by indicating one of the above numbers on a huge label, and in small print they enter an amendment, most often downward. For example, 19 inches in practice quite easily turn into 18.5” or even 18.3”. This is done by the manufacturer consciously, in order to save money and reduce the cost of producing the device.

Therefore, it is quite obvious that every user asks a question like: “How to find out the diagonal of a laptop monitor?” And not the one that is written on the box, but with which you actually have to work.

Changing system fonts

System fonts are a collection of desktop icons, their labels and design elements. In other words, what is responsible for displaying the workspace on the “desk” or windows like “Explorer”.

These elements are interconnected, so when you change one parameter, the rest are automatically adjusted to it. How to change the font size for more convenient reading?

Through the settings of the OS itself

  1. Call the desktop context menu and go to the “Personalization” section.


    Call the desktop context menu by right-clicking the mouse, go to the “Personalization” section

  2. Find the tab called “Window Color” and open it.


    Find and click on the “Window Color” icon

  3. In it, click on the “Advanced options” link.


    Click on the link “Additional design options”

  4. Expand the list in the “Element” parameter.


    Expand the list in the “Element” section

  5. After selecting the elements, use the controls to set the desired font size and type, etc.


    Select an element and configure the necessary parameters

  6. Save settings.


    Click “Apply” and confirm “OK”

Changing the font without changing other parameters

Sometimes it happens that the user is satisfied with the size of the icons and other interface elements, but the font seems inconvenient. On the “seven” and later versions, it became possible to directly change the font size and type without affecting other design:

  1. Call the desktop context menu and go to the “Personalization” section. Call the desktop context menu by right-clicking the mouse, go to the “Personalization” section
  2. Open the “Screen” tab.


    Open the “Screen” tab

  3. Mark the required scale parameter, adjust the font size until the display is as convenient as possible.


    Mark the required value and click “Apply”


    In Windows 8, select the appropriate scale and select the required font size

  4. Save changes.

Methods for measuring monitor diagonal

Manual diagonal measurement

Manual measurement. It is impossible to come up with a simpler and more reliable method - you will need a calculator and a ruler. Or a tape measure, a meter, a caliper (it’s a joke about the caliper, although you can also use it). We apply the tape measure to the corners of the screen and remember or write down the resulting value. You need to measure exactly the area where the information is displayed and not take into account the frames around the display. The resulting numbers need to be divided using a calculator by 2.54 and you will get the required inches. Some length measuring instruments are marked not only in millimeters and centimeters, but also in inches - then there is no need to divide.

Specialized programs

Specialized programs. AIDA64, SiSoft Sandra and similar diagnostic tools will help you find out the diagonal of your computer monitor without resorting to rulers. By going to the “Display” section (the name may differ for different software - we are looking for the most appropriate item in the program menu) where opposite the “Monitor” line will be the desired parameter. The program takes the value from its own database, so if the data is displayed incorrectly or is not there at all, we recommend using a newer version.

How to find out the monitor diagonal size using documentation?

If you still have the box from your device, then inspect it from all sides - usually in one of the corners there is a sign with a list where the manufacturer writes down the parameters.

Google to the rescue

Not necessarily, of course, Google, but using a search engine you can get to the equipment manufacturer’s website, where in the section of products manufactured by the company, select your model and see what’s what.

Factory sticker on the case

If the above methods are not suitable for some reason, you can try to inspect the device and look for a factory sticker on the case - the factory will have written down the basic data on it that you can use.

Method of mathematical solutions

For really desperate geometry lovers, we suggest using a method for solving a simple problem. Here the well-known ancient Greek philosopher and mathematician Pythagoras comes to the rescue with his famous theorem. It states that the sum of the squares of the legs of a triangle is equal to the square of its hypotenuse. In our case, the sides will be the vertical and horizontal of the display, and the hypothesis will be the value we are interested in. We perform simple calculations - we square the width and height separately, sum them up and extract the square root from the resulting number. If the ruler is graduated in millimeters, then divide the result by 2.54 and get inches.

* When applying rulers, tape measures, etc. to the display, be careful not to damage the matrix and its coating with sharp parts. Some screens are very fragile, and leaving a scratch is easy.

The first method is the most accurate and guarantees absolute accuracy of the result. You will take the measurement yourself and, with a careful approach to the matter, error will be eliminated.

Diagonal diagonal is different

When choosing an electronic friend based on display size, before finding out what diagonal the monitor has, you should pay attention to the aspect ratio. The total screen area with an aspect ratio of 4:3 is larger than that of 16:9. The first option is more suitable for typing documents, internet browsing, and office work with text files. The second format has a multimedia focus - large-format cinema, graphic editors, watching videos, video processing programs. Therefore, if you do not plan to work on a computer, then 16:9 will be the best choice - films will not be cut off at the edges with black stripes.

Other measurement methods

We hope that the methods we have proposed will be enough to find out the monitor diagonal in any situation, and we will not consider completely exotic ones. Let’s just list them for, so to speak, general educational purposes:

  • Laser rangefinder.
  • Use an object of known length.
  • Odometer. This is a device for measuring length and distance, it is a wheel that needs to be rolled along a segment and the arrow of the device will show the distance traveled in millimeters.


How to find out the diagonal?

Sometimes you come across round or oval screens, then the indicator is taken as a line running between the points that are farthest from each other, which are opposite. Let's find out how to calculate how many inches there are in a monitor.

The screen has narrowed - reasons and solution

Narrowing of the monitor screen can be caused by:

  • incorrect screen resolution (for example, the selected resolution is designed for a 16:9 ratio on a 4:3 monitor or vice versa);
  • The video card driver is not installed;
  • TV or second monitor connected;
  • The monitor is not configured correctly.

Incorrect resolution

This problem can be checked through the Screen Resolution menu.

  1. You need to right-click on the desktop, then click on the line that says “Screen Resolution”.


    Right-click on the desktop and select the “Screen Resolution” option.

  2. In the open window, you need to find the “Resolution” parameter and activate it by clicking on the triangle icon.


    In the “Resolution” parameter, click on the triangle icon

  3. The required resolution is set using the slider.


    Use the slider to set the appropriate resolution

  4. Once selected, click “Apply”, then “OK”.


    Click on the “Apply” button, then “OK”

Lack of driver

The problem most often occurs when the OS is reinstalled or the driver or (less often) the video card itself malfunctions. If everything is fine with the video card, try downloading the latest version from the developer's website.


Download drivers for the video card on the manufacturer’s official website

Video - How to install the driver if you don’t know the video card

Connected monitor or TV

  1. First you need to try to disconnect the additional device from the laptop.
  2. If after this the screen returns, then the problem is the difference in resolutions between the laptop monitor and the TV or second monitor.
  3. The next time you connect, you will need to select the desired display and change the resolution manually in the “Screen Resolution” option.


    In the “Multiple Screens” section, after disconnecting or connecting the second screen, select the appropriate value

Monitor settings

If none of the above methods are suitable, then the problem may be in changed settings of the monitor itself (changing the length and width of the image, for example). The solution may be to automatically adjust the image. Every monitor has this button.


On the monitor, press the special “AUTO” button

Video - What to do if the image on the computer monitor screen has moved off

What is the diagonal of a monitor measured in?

A monitor is a device that is designed to display information in text or graphic mode. More often it is used to display data on the screen.

Let's find out how the diagonal of the display is measured. An inch is a unit of length. Converted to centimeters, the value is 2.54.

Has the designation ″.


Computer monitor diagonal

The most common monitor indicators are:

  • computer screen – 17″, 19″, 21″, 23″ (inches);
  • TV – 32″, 43″, 49″, 50″, 55″, 65″ (inches);
  • smartphone, mobile phone, tablet – 4″, 3.5″, 5″, 5.5″ (inches);
  • laptop monitor – 13.3″, 15.6″, 17″, 19″ (inches).

Some developers show cunning when they indicate one of the listed indicators on a large label, and in small letters introduce an amendment, usually downward, not in favor of the buyer. This is done deliberately in order to save money and reduce production costs for the development of equipment.

We present the most common indicators in terms of centimeters:

  • 11 inches – 27.94 cm;
  • 15.6 – 39.5 cm;
  • 17 – 43.18 cm;
  • 19 – 48.26 cm.


Computer or laptop monitor settings

Determining the size of a laptop screen using third-party programs

One of the simplest and most common programs suitable for determining display size is AIDA64. All you need to do is download the application, launch it and carry out a few simple manipulations.

First of all, go to the “Display” and “Monitor” tab. The program will scan the characteristics of your device and display all the necessary data.

In addition, you can find out other useful information that may be useful in the future - release date, aspect ratio, etc.

Important! Please note that although the program is paid, you will have access to a free demo mode for the first month. Scanning characteristics takes very little time, so there is no need to worry about it.

Now you know how you can quickly and easily find out the display diagonal of your laptop in different ways. Choose the one that suits you best and get the information you need right now!

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