# How to measure the diagonal of the TV and how to choose it for the room

TV diagonal – what is it, how to choose and measure in inches and centimeters. When buying a TV, they want to choose one that provides the most comfortable viewing experience. First of all, they think about the quality of the incoming television signal, the display of various colors and shades on the screen, the number of pixels used and the screen manufacturing technology. These characteristics are important, but you need to understand that with an incorrectly selected screen diagonal, viewing can not only become uncomfortable, but also create an increased load on the eyes.
In order to ensure comfortable viewing, it is necessary to take into account not only the size of the screen, but also the dimensions and shape of the room in which the TV is installed. Too large a value will cause the image to be too detailed, with the details attracting attention in the first place, and to perceive the picture as a whole, you will have to strain. When viewing on a very small screen, you will need to constantly peer, which will distract from the actual viewing of the program and create eye strain. Some people think that a large screen size looks more prestigious, but when viewing at close range or in a small room, a smaller TV can be much more convenient. Therefore, determining the desired diagonal is an important point in the procedure for choosing a TV.

## How to measure the diagonal of the TV in centimeters and inches

As you know, the TV screen has a rectangular shape. To indicate its dimensions, you can express the length and width or give the size of its diagonal. The last option is the most popular way to specify its value. In different countries of the world, units of measurement for length may be different. For example, in most of Europe it is customary to use the SI measurement system, where the standard unit is the meter or its derivatives (including the centimeter). In the United Kingdom and the United States, the use of inches to measure length is widespread. Traditionally, it is in these units that the screen diagonal is measured.

1 inch equals 2.54 centimeters. Accordingly, 1 centimeter is 0.3937 inches. Using these ratios, you can represent the values ​​\u200b\u200bspecified in inches in centimeters or convert them back. For example, if the diagonal length is 40 inches, then to convert to centimeters, this number must be multiplied by 2.54. As a result, the desired value will be 101.6 centimeters.

When choosing a model with the required diagonal value, you need to take into account that the size of the TV receiver will slightly exceed the indicated value by the thickness of the frame used. In modern models, they often have a very small thickness. Below is a conversion table to centimeters for the most popular screen sizes. When considering the length and width of the display, you can find out the size of the diagonal if you use the Pythagorean theorem. She claims that the sum of the squares of the legs (in this case we are talking about the length and width of the screen) is equal to the square of the hypotenuse (diagonal). When calculating, you need to take into account which units are used and translate the resulting numbers into the desired form. Using the Pythagorean theorem:
When calculating the dimensions, you need to take into account the ratio of the height and width of the screen. One of the most popular is the 9:15 ratio.
In such a situation, the specified parameters can be accurately calculated along the diagonal. You can also use the Pythagorean theorem for this. Write the following equation in one unknown.
This expression can be brought to an equivalent form.
From the resulting formula, you can find X and use it to calculate the height and width of the screen, multiplying, respectively, by 9 or 16.

### Convert cm to inches and vice versa

Using inches to measure screen sizes is common, but not everyone’s comfortable. To convert inches to centimeters, multiply the corresponding value by 2.54. The reverse conversion (to convert centimeters to inches) is done by dividing by 2.54. Sometimes for carrying out transformations it is more convenient not to make calculations, but to use the corresponding table. The ratio of inches and centimeters:

### Screen sizes and diagonal

Although the size of the diagonal of the screen is more often indicated, when choosing it is important to know its length, width and aspect ratio. These data are available in the accompanying technical documentation. However, sometimes the diagonal value is indicated in the name of the corresponding model. Often the first two digits in the name are used for this. The diagonal size, width and height of the screen are related, since in most cases a fixed aspect ratio is used. The very first televisions used a 1:1 aspect ratio. With the development of technology and the advent of new technologies for creating screens, 5:4, 4:3, and also 16:9 began to be used. Now the most popular are 16:9 and 21:9.

### How to measure the size of the diagonal correctly

In order to determine the size of the diagonal, it is necessary to measure the length of one of the two diagonals of the display, for example, the one that runs from the lower left corner to the upper right. If the length is determined in centimeters, then the resulting value must be divided by 2.54. When comparing with the manufacturer’s data, it is necessary to clarify how such measurements were made. It should be borne in mind that sometimes we are talking not only about the screen, but about the size of the diagonal of the case. In such a situation, when comparing, you will need to make an appropriate correction.

## How to choose a TV diagonal for different rooms, areas, distance to TV and taking into account other parameters

The importance of choosing the right size of the diagonal is due to the following reasons:

1. The right dimensions of the TV will ensure comfortable viewing of programs for many years.
2. The highest quality of the resulting image is achieved at a certain distance, which will be optimal. If you look closer, then the details of the image may stand out too much, if you look further, it will be more difficult to fully perceive the video.
3. Watching TV programs on a regular basis creates a significant load on the eyes, which in the long run can lead to visual impairment. The correct choice of distance to the screen.
4. When viewed in high quality formats, there may be technical recommendations that are related to the minimum diagonal size. For example, for 3D it needs to be at least 49 inches. When using 4K, you will already need a screen corresponding to 50.

As a result of the research, recommendations have been proposed regarding the choice of distance for comfortable viewing. The minimum and maximum distances are indicated here. These guidelines are shown in the following image. Distance table:
Usually a person knows in which room he is going to place the TV. Its dimensions limit the distance at which television broadcasts can be viewed. He must choose the diagonal that corresponds to the existing conditions. In this case, choosing the maximum allowable value will allow you to get the highest quality video display. Sometimes a special formula is used that determines the relationship between the size of the diagonal and the distance from which the transmission is viewed. To determine the viewing range in it, you need to multiply the diagonal by 3 or 4. Another factor limiting the choice is the financial capabilities of the buyer. Therefore, when buying, it is sometimes more profitable to buy a screen a few inches smaller, but at the same time located in an affordable price category. When choosing, it is necessary to take into account the quality of the resulting image. If it is high, then you can view it even using a close distance. Televisions that provide 720p quality are common. In this case, when viewing at a diagonal of 32 inches closer than about two meters, the graininess of the screen becomes more noticeable. If you choose a larger distance, the picture will be more beautiful. You can use the following chart to select the desired distance.
It is necessary to take into account the technology in accordance with which the display was made. When using LED or
OLED, the screen refreshes at a high frequency, making viewing comfortable from various distances. High-quality image and color reproduction allow the viewer to look comfortably from almost any reasonable distance. Screens based on HDR technology provide good image brightness, ensuring the most natural colors. When using such TVs, the relationship between diagonal length and viewing distance becomes less rigid. When determining which screen is needed, one must determine the purpose of the acquisition. If it is needed for collective viewing, it is advisable to choose a larger size. When you buy, for example, a device for the kitchen, a TV with a small diagonal may come up. When choosing in a store, it makes sense to stand at the same distance at which the house will be viewed and feel How suitable is this example? How to choose the right TV diagonal: https://youtu.be/eDkmFwW5Wvk Sometimes, when choosing, you can proceed from the following rules:

1. In a small room, a screen with a diagonal that does not exceed 17 inches is suitable.
2. In a room of approximately 18 sq. meters should use devices with a diagonal not exceeding 37 inches.
3. In spacious rooms (if the area is more than 20 square meters), screens that fit 40 inches or more are better suited.

It makes sense to make a more accurate choice taking into account the quality of television broadcasts. The purchased device will be an important element of the design of the room. It is required to choose one that will match the existing design style. With the wrong choice, unpleasant consequences may occur. They may consist of visual impairment, drying of the mucous membrane of the eye, muscle strain from using an uncomfortable position. Sometimes the wrong organization of viewing leads to the formation of headaches. Properly selected screen size will provide comfort for many years of use. To find the optimal position for the screen, it is important not only to choose the right distance, but also to set the right height for it. The most suitable position is when the center is at eye level of the audience. The situation is allowed

## Widescreen TV Diagonal Table

Previously, the most popular display format was 4:3 aspect ratio. Now often films and TV shows are made to be shown on a wide screen. Thus, the viewer, when viewing, can more fully perceive what is happening. 16:9 Wide Screen Size Chart:
It should also be taken into account that this aspect ratio may be related to the quality of display that can be provided. The 16:9 format is now becoming more and more common. Almost all new TV models are produced with this aspect ratio.

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