Table of Contents

## 3 ways to find out the diagonal size of your TV

What are the criteria for choosing a TV? Technical characteristics are very important, but first of all you need to decide on the diagonal. Few people know how to measure the diagonal of a TV. There is nothing difficult in this. Now let’s analyze this moment.

Mostly consumers, in the process of choosing the optimal TV device for themselves, take into account the size of the equipment and the characteristics of the screen. After all, the level of comfort while watching a series, TV program depends on this.

The calculation of the dimensions of the TV is carried out by measuring the diagonal of the screen, but few of the users know which unit of measurement is wiser to use. There is an opinion that the diagonal of a TV device in centimeters is larger. This information is not true. Now let’s analyze all the nuances regarding the rules for measuring the screen.

## How to convert inches to centimeters correctly

Inch (2.54 cm) is not the most popular unit of measurement. Despite this, this unit of measurement continues to be used. This value is considered a little outdated today based on the new SI rules. over, there are plans to even withdraw inches from circulation.

At the moment, this has not yet happened, so this unit is used when indicating the size of the device, especially by TV manufacturers. Companies designate screen size this way. Despite the fact that it is easier and more familiar to calculate the screen diagonal in centimeters, calculations are still carried out in inches.

″ Is the designation of an inch used in the description, instructions, etc. It does not bother users to measure the diagonal of TV-devices not only in inches, but also in cm.

The key parameter of the TV screen is the distance, which is measured between the left and right corners of the matrix. Use special automated converters. These online services allow you to convert different units of measurement. At the same time, these programs will not answer you the question of how to determine the diagonal. But they give information about how many centimeters are in a particular value. Consider an example, a calculated screen of 40 inches is about 102 cm.

Before finally choosing the model and size of TV, it is recommended to look at the table of base values and get information about how many cm in a particular screen, then make your own calculations.

In order not to waste time converting the diagonal to centimeters, use this table:

Value in dm | Value in cm |

22 ″ | 60 cm |

32 ″ | 82 cm |

37 ″ | 94 cm |

40 ″ | 102 cm |

42 ″ | 107 cm |

fifty” | 127 cm |

60 ″ | 152 cm |

70 ″ | 178 cm |

## Diagonal measurement

How to find out the diagonal of the TV? There are several ways. Often the box of equipment is thrown away, but the instructions cannot be found, then you can choose one of the options presented:

- Find TV model on the Internet.

How to measure the diagonal of a TV? For this process, you need to arm yourself with: a tape measure, a meter (you can use a ruler), a sheet of paper and a pen. If you are not sure of the correctness of the calculations made in your mind, it is better to take a calculator.

Consider a guide on how to manually measure the diagonal:

- From the corners of the screen of the upper right to the lower left, we stretch a tape measure (meter). Please note that the body of the device is not taken into account. After that, we check the tightness of the tape along the entire length. If there is no tape measure, then you need to take the thread, pull it along the TV and cut or mark another corner. Then measure the length of the thread using a ruler.
- We take a pen and paper, indicate the obtained measurements in cm.
- We carry out simple calculations. Accordingly, you will need to convert cm to inches. The resulting measurements in cm are divided by 1 inch (2.54). If it is difficult to divide into a column, use a calculator.
- When the meter is not enough to calculate the size of the device, you can use the second calculation option. You will need to measure the sides (width, height) separately.
- Now you need to carry out calculations according to the Pythagorean theorem. We square the length and width, add them and extract the square root from the resulting sum. To avoid oversights, use a calculator. The result must be converted to inches (divide by 2.54).
- Another easy way to find out the diagonal of a TV is to take a close look at the TV case. Often it is not the diagonal of the display that is indicated, but simply the distance from the top to the bottom of the screen frame. Therefore, using this option, you need to be careful.

To make sure that the information is correct, it is best to look at the warranty card or technical passport of the device, if such has been preserved. You can often see how many inches are on the TV on the cover of your passport.

What is the relationship between the diagonal of the screen and the size of the TV? We will answer this question further.

## The relationship of the diagonal with the size of the TV

Two points that affect the choice of the diagonal of a TV device:

- distance from the point of view to the screen;
- screen resolution.

The relationship between screen resolution and TV size is an indisputable fact. The higher the resolution, the closer the viewpoint can be without loss of quality. Therefore, if the resolution is lower, then the diagonal of the screen (when measured in cm) must be smaller, or it is required to increase the distance between the device and the viewer.

In practice, everyone can check this on their own. When you look closely at a low quality picture (terrestrial TV), all the disadvantages of the picture are immediately visible. If you move away a little, the defects will not be so noticeable.

Let’s look at an example. Take TV 40 “, for a terrestrial signal, the distance to the TV should remain about three 40”. Therefore, we multiply 40 by three, we get 120 ″, translate into centimeters 3.04 cm, at least 3 meters.

If the resolution is 720p, then the distance to TV is allowed at least 1.9 meters. When the model supports Full HD, viewing can be carried out from a distance of 1.3 meters.

That is, from such calculations, you can get the permissible minimum distance to the TV device, depending on the screen size and resolution. Thanks to competent calculation, you can avoid when viewing obvious defects that are associated with the signal structure.

Let’s take another example. Let’s say you plan to view at a distance of 2.2 meters. When purchasing a device with HD Ready resolution, you will have to opt for a model up to 37 ″.

When the resolution is Full HD, the dimensions of the device are allowed up to 52 inches. What’s more, there will be no loss in image quality. If you are using a 4K TV, the distance from the point of view to the screen must be at least 2.2 meters.

If viewing is carried out from a distance exceeding a predetermined value, there will not be a huge difference between TVs with different resolutions. It should be remembered that the signal must also correspond to the resolution of the device itself, this increases the quality of the reproduced content.

As a result, today a large number of models are being released in Full HD and the line is expanding with 4K. At the same time, do not forget that the number of pixels in the video signal should also be taken into account.

625 lines is the resolution of terrestrial TV. Digital TV is gaining momentum in popularity and the resolution will be higher than SD. Many Full HD movies are released, but very little Ultra HD footage.

It is recommended today to carry out all calculations on the condition that you plan to view content with Full HD resolution. Then you will know the minimum distance. If you need to increase the distance, there will be no loss of image quality. This is the most correct decision.

The minimum distance from TV to the viewing point and the size of the TV diagonal are related to the following table:

The table above contains two indicators that allow you to determine the third parameter. Analyze the horizontal values to find the optimal diagonal. The resolution is in a vertical column. When two parameters are connected, the required distance in meters from the TV to the viewing point is formed

720p signal is provided by satellite dishes, digital TV, game consoles. It is better to purchase a TV with Full HD resolution if there is source of this signal. Of course, you can use schematic solutions that increase the signal resolution to this indicator. It should be understood that this method is not capable of providing a constant 100% result.

The “presence effect” of the viewer is the reason why special attention is paid to the diagonal, resolution and position of the TV. That is, exactly how much each user is immersed in the image on the screen. Peripheral vision also affects this effect, and the viewing angle of the picture affects the functioning of this process.

As an example, the following guidelines exist for HDTV:

Angle | Viewing distance |

20 ° | x 2.5 |

30 ° | x 1.6 |

40 ° | x 1.2 |

The last option is the minimum viewing distance for Full HD TV.

When purchasing a device for the home, you should take into account not only this effect, but also other subtleties caused by restrictions in the installation of TV. As a result, the appropriate distance and the TV diagonal are not linked by 1 value, but a whole range of recommended indicators is indicated.

Most often, for a specific diagonal, manufacturers independently select the optimal viewing angle. If you adhere to these recommendations, then you can make viewing convenient and ensure complete immersion:

- Maximum from 30 to 40 °;
- Minimum 10 to 20 °.

As a result, it is recommended to immediately determine for yourself the distance from the viewing point to the screen, on the basis of which you can choose the already optimal resolution and diagonal in centimeters. This will create comfortable conditions for watching any program of the series and other content.

Summing up, we can say that the quality and comfort of watching TV depends on the choice of the diagonal of the TV device. It should be noted that 40-55 inch models are much more expensive than more compact options. Also, such dimensions are not universal, since not all rooms will be able to arrange them according to the rules.

For a standard room, consider a 32-inch or 40-inch TV. It is recommended that you familiarize yourself with the purchase bidders available to you in advance, and then make your final choice. But when choosing a device, do not forget about a number of related factors affecting the picture quality.

## Viewing distance and screen diagonal

When there were CRTs, there was a formula according to which the viewing distance was chosen equal to 4-5 screen diagonals. Today, modern TVs do not do so much harm that you need to sit down because of safety. Now the choice of distance depends only on the comfort of viewing the picture on the display.

But the viewing comfort depends on the diagonal of the screen, on the screen resolution and on the viewing distance. These three values are interrelated, and when choosing a TV diagonal, you need to take into account both the screen resolution and the viewing distance.

The viewing comfort is determined by the pixel structure of the picture on the screen. And the minimum distance at which the pixels on the screen are no longer visible is the desired distance. Why is it advised to sit closer to the screen? Such viewing will use peripheral vision, similar to viewing in a movie theater, and you will be able to immerse yourself more virtually in what is happening on the screen. But when watching news broadcasts, you often need to sit at a greater distance in order to normally see all the elements on the screen (creeping line, weather informer, time in sports programs). It is advisable when watching TV to avoid moments when you need to constantly turn your head in order to keep track of what is happening.

Diagonal selection by distance and screen resolution

Hence, it turns out that the optimal viewing distance is chosen based on the broadcast content. When watching movies, it is advisable to sit closer to the screen, so as not to notice the pixels on the screen. And when watching news broadcasts, you need to choose a distance so as to keep the entire screen in sight without turning your head. over, most films today are in Full HD (1920×1080) quality and this allows you to watch such video at close range, and TV shows can be broadcast in either SD quality (625 lines) or 720p (720 lines). In short, without calculations, the optimal distance can be considered 1.5-3 diagonals of the screen. Read more about viewing distance here.

## TV diagonal

Screen diagonal is determined by the distance between opposite corners of the TV display and is measured in centimeters or inches.

Let’s see how to measure the diagonal of a TV:

We measure the diagonal of the display

In the marking of TVs, the diagonal of the screen is always written in inches. These numbers, denoting the diagonal, are at the beginning of the marking in almost any manufacturer.

Example: Samsung name UE-65 HU8700,

65.this is the diagonal in inches.

The packaging may have a designation in centimeters. As a reminder, 1 inch equals 2.54 centimeters. For example, a 32-inch diagonal would be 81.3 centimeters (cm) and 40 inches would be 101.6 centimeters. In this case, the horizontal size and height of the screen will be different, because we consider the diagonal.

Most modern TVs have an aspect ratio of 16: 9. The dimensions of the TV will be several centimeters larger, depending on the size of the frame of the case, but in modern TV sets this frame is very thin.

## TV size and installation location

You can decide on the place of installation of the TV set at home. For normal ventilation of the device, you need to create a gap between the sides of the TV and other objects of several centimeters.

But the price of a TV set strongly depends on the size of the screen; with an increase in the diagonal by only a few inches, the price can rise by several hundred dollars at once. Therefore, your budget, which you have allocated for the purchase, affects the final screen size. Having chosen the maximum possible diagonal, depending on the installation location and taking into account the budget, we proceed to further steps to determine the optimal size of the TV receiver. Further choices must be made based on the viewing distance of the TV.

## Viewing angle and screen size

So much attention is paid to screen diagonal, resolution and viewing distance because these parameters affect the “presence” of the viewer. This effect indicates how immersed you are in what is happening on the screen. Peripheral vision affects immersiveness, while peripheral vision depends on the viewing angle of the image.

Viewing angle when watching TV

When buying a TV for your home, and not just for a home theater system, you need to consider not only the immersive effect, but also other features associated with restrictions on the installation of the TV receiver. Therefore, the optimal distance and the diagonal of the TV are not associated with one value, but indicate the range of optimal distances for each diagonal. Both manufacturers and sellers of TVs went for this.

Usually, for a certain diagonal, the distances corresponding to the viewing angles are indicated (different sources have different data):

- Maximum 30-40 degrees;
- Minimum 10-20 degrees.

Diagonal TV viewing distance determination table

Having decided on the viewing distance, you choose the diagonal of the TV screen, or vice versa, choose the maximum possible diagonal and then determine the optimal viewing distance.

As for the screen resolution, TV receivers with Full HD resolution are mainly produced today. This is by far the most popular resolution. The new Ultra HD models are still very expensive and are only available in the top end at a great price. Although Ultra HD models are gaining popularity every year, and for 2016 among TV models, 4K resolution is no longer inferior to Full HD in terms of the number of models.

## How to choose the size of the diagonal

Two factors influence the choice of the TV diagonal:

- distance. from which you will watch the television receiver;
- picture resolution. displayed on the screen.

And this picture resolution depends both on the screen you purchased and on the video signal supplied to the TV input.

In the picture you can see how to measure the diagonal of the TV.

You can check this yourself when choosing a TV receiver. If you look closely at a picture with low quality, for example, on-air television, you will notice all the shortcomings of both the image and the video signal processing circuits. And if you step back a little, small errors will become imperceptible.

For example, if you take a 32-inch TV receiver, then for a signal with 625 lines (terrestrial television), the distance to the screen will be about three diagonals 32×3 = 96 inches or 96×2.54 = 243 centimeters, which is approximately 2.5 meters. And if the image resolution corresponds to 720p, then the distance to the screen for normal viewing will already be 1.9 meters or more. If the TV is already Full-HD, then it will be convenient to view the video picture from a distance of 1.3 meters or more. These are the minimum distances to the screen, when viewed from which distortions caused by the structure of the video signal will not be visible in the picture.

For example, if your viewing distance is about 2.2 meters, then when buying an HD Ready TV, you can choose a device with a diagonal of up to 37 inches. If you choose a Full-HD TV, you can increase the diagonal up to 52 inches without sacrificing picture quality. And the new 4K (Ultra HD) models with UHD video conversion will already be over 60 inches at this viewing distance.

For example, one of these TVs: Samsung UE-65NU7400.

65 ” diagonal, 4K resolution, upscaling module that upscales any video to 4K.

UE-65NU7400

But when viewing from a distance that exceeds the calculated one, there will not be much difference between TVs with different resolutions. Do not forget that the video signal must correspond to the resolution of the device itself for the highest quality reproduction. Therefore, when today almost all TVs are Full HD and even models with Ultra HD resolution (4 times more than Full HD) appear, then the number of pixels in the video signal must be taken into account.

Terrestrial television still has SD resolution (625 lines). But digital television is already spreading more and more, and there the resolution needs to be recognized additionally, but it will be larger than SD. There are many films in Full HD quality, but there is very little content with Ultra HD so far. It is possible to advise for today all calculations to be carried out on the condition that you are watching a video with Full HD quality, and you will get the minimum viewing distance. And if you need to increase the distance, for example, installing a TV in the living room, then you will not see any damage to the picture quality.

An example of a modern (2018) TV with Full HD resolution: LG 43LK5900.

## TV screen diagonal

The diagonal of the TV plays an important role when choosing a TV receiver. The comfort of watching video on the screen depends on the correct choice of the screen size. And it is completely wrong to say that the larger the diagonal of the TV in cm, the better.

How much will it be if you convert 1 inch to cm? As you know, 1 inch equals 2.54 centimeters. Inch (from the Dutch. Duim. thumb) is the name for the unit of measurement of distance in European non-metric systems of measures. Today, an inch is most often understood as an English inch (English inch), equal to 2.54 cm exactly.

- 1inch = 2.54cm = 25.4mm
- 1cm = 0.3937inch
- 1 m = 39.37 inches

In English units, 1 inch = 12 lines = 72 points = 1/12 feet = 1/36 yard.

After the adoption of the international system of units of measurement SI, inches are considered an obsolete designation, which should be gradually phased out. But, despite this, inches continue to be used in engineering when specifying calibers and form factors, for compatibility with long-established technical solutions. In this case, a double prime (quotation mark “) is used as an inch sign.

In television technology, inches is the diagonal of the screen, which is measured as the distance between opposite corners of the matrix. For example, 37 “means a screen with a diagonal of 37 inches or 37×2.54 = 93.98 cm.

Simple length converter to convert inches to centimeters and cm to inches:

For example, if you take a 32-inch TV, how much will it be in cm? Using the calculations in the converter, we get that 32 inches in centimeters will be 81.3. Another example, converting 22 inches to cm, we get 55.9 centimeters. And if we take a diagonal of 42 inches, we get 106.7 centimeters.

TV diagonal in cm and inches, conversion table:

Inches | Centimeters |

22 “ | 60 cm |

32 “ | 82 cm |

37 “ | 94 cm |

40 “ | 102 cm |

42 “ | 107 cm |

fifty” | 127 cm |

60 “ | 152 cm |

70 “ | 178 cm |

### Diagonal of the TV in cm table

The minimum viewing distance of the TV and the size of the screen diagonal can be related to the following table:

The diagonals of TVs are presented in inches and centimeters, the table makes it possible to choose the third one by two parameters. In the table, choose the horizontal size of the diagonal of the screen, vertically choose the video resolution on the screen (it depends on both the TV and the signal at the input), and at the intersection of these values there will be the desired viewing distance in meters.

A signal with 720p quality can be output by satellite TV programs, games from consoles, copies of BD discs, digital TV.

1080p resolution corresponds to Full-HD TVs and it is better to use such devices if you have such signal sources. Although there are circuit solutions for increasing the signal resolution to 1080p, such circuits do not always work perfectly. Everything needs to be checked on the spot.

Therefore, it is better to decide on the distance to the screen in advance and, accordingly, select the desired resolution and TV diagonal in cm for comfortable viewing.

## How to convert the diagonal size of the TV screen from inches to centimeters and vice versa

The diagonal of the TV screen, and of the equipment in general, is measured in inches. This happened due to the use of this value for measuring length in the countries of greatest demand for household appliances. When converted to centimeters, 1 inch of the diagonal of the TV equals 2.54 centimeters. Also, on household appliances, when the diagonal is indicated in inches (to avoid confusion), a double stroke (“) is used after the value of the screen length or other measurements (height, width, length).

- 1 inch = 2.54 centimeters = 25.4 millimeters
- 1 centimeter = 0.3937 inches
- 1 meter = 39.37 inches

## What diagonal of the TV screen to choose

When choosing a certain diagonal of the TV screen, you will need to take into account the size of the room in which it will be placed. And here it is not only about the interior, but also about a comfortable viewing distance. With current environmental standards, manufacturers are trying to minimize the harm to health from watching TV. Here is a table of the recommended distances from a flat-screen (non-CRT) TV by diagonal:

It is quite rightly believed that a correctly selected TV screen diagonal is a guarantee of comfortable viewing of high-quality TV programs and movies without harm to health. Therefore, if high-quality content is at the forefront, then the diagonal of the TV should be as large as the area of the room allows, taking into account the distance to the screen. If the user decides to watch movies in 3D, then this will require at least a 49-inch TV. A minimum diagonal size of 50 ″ is recommended for 4K TVs.

However, the choice of the consumer is often strongly influenced by the allocated budget. An important fact: a difference of several inches may not have a big effect on the picture quality, however, a TV, due to several conventional units of the screen diagonal size, may be in a different price category. Sometimes a few inches can empty your wallet by tens of thousands of rubles.

## TV screen diagonal table in inches and centimeters

To convert inches to centimeters and back when calculating the diagonal of your TV, use the following table for the most common TV screen sizes:

Inches In centimeters22 ″ | 55.88 cm. |

32 ″ | 81.28 cm. |

37 ″ | 93.98 cm. |

40 ″ | 101.60 cm. |

42 ″ | 106.68 cm. |

46 ″ | 116.84 cm. |

fifty” | 127.00 cm. |

55 ″ | 139.70 cm. |

60 ″ | 152.40 cm. |

70 ″ | 177.80 cm |

### For kitchen

It all depends on the room, or rather on the square of the kitchen. For a small area, LCD TVs with a small diagonal are ideal. The optimal diagonal of the TV for the kitchen is 19 to 24 inches. There are 2 criteria when choosing a TV for the kitchen:

- Viewing angle
- Speaker sound quality

The second criterion is especially important, because in the kitchen they often listen to TV programs, and not watch full-size films.

## How to correctly measure the diagonal of a TV screen

As mentioned earlier, the diagonal of the TV screen, and of the equipment as a whole, is measured in inches. When translated in centimeters, 1 inch equals 2.54 cm.In the English system of measures, 1 inch = 12 lines = 72 points = 1/12 feet = 1/36 yard.

To measure the diagonal of your TV, you need to measure the distance between the bottom left and top right corner of the screen. The second way to determine the diagonal of a TV screen is to use the formula for the dependence of the lengths of the sides and the length of the diagonal in rectangles.

## How to choose the right TV screen diagonal

Screen diagonal is the distance from one corner of a TV or monitor screen to the opposite. The size of the diagonal of the screen, and not of the entire device, is usually used by manufacturers as one of the characteristics of the product in the specification.

When choosing the parameters of the TV for the size of the room or depending on the distance to the device, the diagonal length of the screen, usually measured in centimeters or inches, plays a significant role. The choice of diagonal size of the TV screen will depend on the ability to comfortably watch movies or TV shows. It’s no secret that the diagonal of the TV screen is also selected depending on the required screen resolution and viewing distance. Therefore, the statement “the larger the diagonal, the better” is not entirely objective.

## How to choose the diagonal of the TV for the size of the room

As mentioned above, a large screen size is not always the best choice. The main rule: the image should be clear and not ripple. In addition, you need to consider the type of screen: plasma or LCD (LCD). The pixel size of the plasma is much larger, so the distance to the TV for comfortable viewing is much greater.

Attention: if the TV is installed in a niche (furniture or drywall), then the actual size of the diagonal is especially important when choosing a particular model. In addition, the TV should not stand right next to the wall, the device needs constant air circulation from the back.

## Complex geometry and calculation example

Using the knowledge of mathematics and geometry, you can measure the diagonal of the TV in centimeters in another way. Many people remember that in geometry lessons in grade 7 they pass the Pythagorean theorem. Surely, most remember the name, but the formula itself does not.

Important! In fact, it is quite simple: a²b² = c², where a and b are legs of a right triangle, c is the hypotenuse.

In the case of a TV screen, the diagonal is the hypotenuse, and the legs are the length and width of the screen. Do not forget that the TV frame is not included in the dimensions, you only need to measure the screen itself. Accordingly, to calculate the value, you need:

- Find screen length.
- Find screen width.
- Square both values.
- Add the resulting numbers.
- Extract the root from the resulting large number.

After the entire calculation, the diagonal of the TV screen in centimeters will be found. As mentioned more than once above, to convert it to inches, you need to divide the resulting value by 2.54. During calculations, it is recommended to use a calculator to avoid possible errors and reduce or eliminate the error.

If in this form the Pythagorean theorem does not pop up in memory, then an example will be much easier to understand. Let’s say the length and width of the TV screen are 75 and 35 centimeters, respectively. Now we square these values: length = 5625, and width = 1225. Further, according to the theorem, these values should be added: 56251225 = 6850. The last step is to extract the root: √6850 = 82.7, if rounded. This is the diagonal found in centimeters, now you need to convert to inches: 82.7 / 2.54 = 32 inches, if you round up.

## Converting inches to centimeters

It’s no secret that the above parameter is in inches. Many users may have a question: why not indicate the screen diagonal in centimeters. First, you should know that the inch is a non-metric system, and in the Russian Federation they use the metric.

In modern Russia, this unit is practically not used in everyday life, the exceptions are certain industrial sectors, for example, the production and sale of televisions. Measurement in inches is due to the fact that the first TV appeared in the USA, where the non-metric system is used.

Many more may be interested in why they do not use the length and width of the screen, instead of the diagonal. The fact is that manufacturers produce modern TVs only with a standard length-to-width ratio (4: 3, you can still find 16: 9).

Reference! Because of this, only one value is enough. the diagonal of the screen.

In general, if we take it from history, an inch is equal to the distance of the far phalanx of a person’s thumb. If we translate into a more familiar system for Russia, then 1 inch = 2.54 centimeters or 25 millimeters. Accordingly, to calculate in centimeters, you need to multiply the number of inches by 2.54.

## Methods for measuring the diagonal of a TV

In general, there are only two ways to find out the diagonal of the TV. The most correct one is to open a technical passport. One of the pages should contain this information, in addition, many manufacturers indicate the size on the factory TV box.

It is also easy to find this information on the Internet, it is enough to drive the device model into the search bar. It is not uncommon for the manufacturer to indicate this distance on the body. But you need to be concentrated, since in such a situation the number can be both in centimeters and in inches.

But there are different situations when you need to independently measure the diagonal of the TV. In this version of events, you will need a roulette, you can use a ruler, but in this case there will be large errors. To measure, it is enough to know the distance from the lower left corner to the upper right. If you need to count measurements in inches, then the resulting number should be divided by 2.54.

Important! Only the screen is taken into account, the frame is not included in the diagonal, so there is no need to measure it.

Some televisions have a convex screen. Because of this, measuring the diagonal of the TV with a tape measure turns into a waking nightmare. To avoid torment, you should prepare a regular long thread. One end must be attached to the lower left corner, and then stretch to the upper right. Fix the place of “connection” of the thread and the upper corner with your finger, then measure the length. The resulting number is the diagonal, only in centimeters.

## Diagonal comparison table

In order for people to avoid mistakes when converting centimeters to inches, a table with values was compiled. As mentioned above, all models of modern TVs are produced with standard aspect ratios. This means that from this table you can find out sizes that are much more common than others.

Centimeters | Inches |

60 | 22 |

82 | 32 |

94 | 37 |

102 | 40 |

107 | 42 |

127 | fifty |

152 | 60 |

178 | 70 |

254 | one hundred |

In the above table, the diagonal is shown in cm, as well as in inches. It is worth being concentrated in measurement, so as not to get confused in values, measurement systems, calculations, and so on.

Reference! Once again, it is better to repeat that it is recommended to use a calculator, especially if you decide to use the Pythagorean theorem.

## How to choose the optimal TV diagonal?

- the higher the resolution, the larger the diagonal;
- the smaller the aspect ratio, the smaller the diagonal;
- the larger the room, the larger the diagonal (22 inches is enough for the kitchen, and as much as possible for a spacious room, at least 90 inches for a home theater);
- the broadcaster’s signal must correspond to the resolution (that is, a weak or bad signal will give a bad picture, regardless of other characteristics);
- the place where the TV is installed (if you hang it on the wall, then a heavy TV with large dimensions of drywall may not withstand, and if you put it on a special cabinet, then you need to take into account its dimensions so that the device can fit).

If the TV has a low resolution, then it is recommended to watch it from a long distance. For example, at 720p it is better to sit no closer than two meters, and at Full HD you can move up to 120 centimeters. The fact is that when viewing a video image of poor quality close up, all his sins will be visible, and the greater the distance, the less they are noticeable.

## The importance of choosing a TV screen diagonal

In general, the diagonal, like the resolution, affects the clarity and quality of the picture. Therefore, the choice should be taken seriously. The higher these two parameters, the better and livelier the picture will be. Now most manufacturers follow this rule, but on the market you can find TV with a large diagonal and low resolution and vice versa.

If the apartment has small rooms, it is recommended to buy a TV with a high resolution. Since when viewed closely, pixels and other imperfections of the video sequence are visible, and watching a bad image is such a leisure. In general, the ideal ratio is considered to be the ratio at which no pixels are visible.

Important! But at the same time, a person should see all the information on the screen without turning his head from side to side.

## Distance to TV

How to choose the diagonal of the TV depending on its distance from the viewer? What is considered the norm? Most moviegoers prefer oversized TV-monitors, for example, LCD models. But more is not always better. When choosing a large TV panel, you need to take into account in which room and in what place it will stand.

If a family with a child lives in a small apartment with small rooms, it is not recommended to buy a 55 ”LCD model. A TV panel with parameters from 32 “to 40”, like Xiaomi Mi TV 4A 32 International, will be enough.

The distance from the viewer to the TV affects the size of the diagonal. The larger it is, the further you need to be located for comfortable viewing of TV programs.

Important: So that the eyes do not strain, and the properties of the picture do not change during broadcast, the best minimum distance is considered to be indicators of 3-4 diagonals.

A convenient indicator-plate will help determine the very normal distance for various screen options:

Reminder: The diagonal is calculated only in inches. 1 inch is 2.54 cm.

## TV resolution

The number of dots on the monitor image is another feature. The more of them, the better the quality of the broadcast picture. In addition, the increase in pixels leads to an increase in the distance between the person and the screen. At one time, this pattern was called the effect of angular resolution. But this rule applies only when the distance from the viewer to the TV monitor coincides with the recommendations indicated in the table above.

Best high resolution screens (pixel):

- HD (1280×720) or HD Ready (1366×720);
- Full HD (1920×1080);
- 4K (from 3840×2160).

What TV diagonal is better to choose? It is worth paying attention to the difference between an LCD screen and a plasma. The number of dots on the image of a plasma monitor is greater than that of an LCD. And this is possible even with the same size of both screens. It is better to place the plasma panel away from the viewer to provide comfortable, health-free viewing.

The table below will help you calculate the distance depending on the size of the bezel:

For 4K (screen diagonal varies from 49 “and above), a separate plate is presented:

To independently calculate the very distance that will be comfortable for all family members, it is enough to carry out the calculation according to the algorithm below.

For the calculation, it is necessary: The number of points (pixels) of the screen image must be multiplied by the unit of area (measured in advance). the distance from the viewer to the monitor.

Important: A significant distance leads to the fact that the human eye is not able to take into account individual pixels. the picture merges and the perception of the image becomes identical to HD or even SD. But buying a screen that is too small also does not bring comfort. the viewer does not catch the details in the video image well.

### How to choose the diagonal of the TV depending on the room

If we are talking about a small living room or bedroom (up to 24 sq.m.), the optimal purchase would be a 40 ″ to 55 ″ LCD screen with 4K support.

If the buyer wants to equip a cinema hall in a large room, everything will be limited only by his finances. How many inches the model you like is practically irrelevant. But you also need to remember the fact that with a distance of more than 5 meters from the viewer to the screen, it makes no sense to buy a 4K device. This is not a good distance considering that the eyes will not be able to recognize pixels anyway.

## Optimal TV diagonal. a guide in 3 points on choosing a screen size

Getting the right TV diagonal is not easy. Indeed, in the future, the quality of the displayed picture directly depends on the unmistakable choice. It is necessary to make the right decisions in relation to a particular model based on a number of criteria. Among them: the distance from the viewing site to the screen, the resolution and the area of the room where the TV monitor will actually be located. How to determine all the indicators and what advice should be heeded. further.

The choice of the TV diagonal (for example, LG 32LM6300PLA) directly depends on its location in the room, including at what distance the viewer’s eyes will be from the monitor. Comfort is not the only goal to be achieved after purchase. The safety of all family members is important. Resolution, room area. the subtleties you need to know. Taking simple calculations as a basis, as well as studying the proposals from the manufacturers, you can safely choose the Honor diagonal, which will satisfy all the wishes of the cinematographer.

## Converting inches to centimeters

If you want to know how many centimeters diagonally will be in the TV display with a value of 32 ″, multiply the number 32 by 2.54 and get the value in centimeters. 81.28. The result is always rounded up.

And if you do not have the ability or desire to use a calculator, then you can find out the value from a special table:

## Why is TV diagonal measured in inches

Since TVs are technological products, they were the first to appear abroad. And there their values were always indicated in inches, since this is their metric. And when television sets began to be imported into the USSR, for a more convenient understanding, special tables of correspondence between the values of inches in centimeters were created.

The parameters specified in inches can have different designations:

Inches measure the distance and length of all foreign products: TV, turntables, car parts, weapons, household appliances, etc. Therefore, learning to understand this non-metric unit of measurement will be very useful.

## Correspondence table of the diagonal of the TV in inches and centimeters

TV parameters are very important values when choosing a technique. They affect the quality of the transmitted picture, its size and determine the required distance for watching TV programs.

However, manufacturers indicate the diagonal of the TV screen not in cm, but in an unusual measurement for us. inches. Is there a table of correspondences of such values, how to navigate in it and is it possible to learn how to quickly translate one value into another. let’s figure it out.

## How to measure the diagonal

The diagonal of a TV is the distance between the corners of its screen. This parameter plays a decisive role when choosing a television receiver. Not only the quality of the displayed picture depends on it, but also the viewing comfort.

The rules for measuring the diagonal TV are that not the entire body of the device is measured, but only the distance between opposite corners of the matrix. It is very easy to convert inches to centimeters if you remember that:

And to carry out the reverse calculation, you need to divide the centimeters by 0.3937 and get the value in inches.

## The relationship between diagonal and TV dimensions

We figured out the dimensions of the screen diagonal, but what will be the length and width of the TV? It also has its own tables.

Different formats display video content differently. For example, in a 4: 3 format, the ratio of the length and width of the image will correspond to the ratio of 4 to 3, that is, it is 4 parts long, and 3 parts wide.

This format is gradually becoming a thing of the past, and modern films, TV shows or other video broadcasts are broadcast in the widescreen 16: 9 standard, where 16 parts of the length are 9 portions wide. Such content is perceived more realistically, believable, in it you can successfully preserve the real proportions of the image.

With an aspect ratio of 16: 9, the main TV models will have the following values:

If you want to understand how values are calculated mathematically, you need to remember the Pythagorean theorem, which determines the diagonal of a rectangle: √a2b2. And if we take the standard 16: 9, then we get the following equations:

Now we find the scaling value by dividing the diagonal value by the printed number. For example, let’s find out the size of a 40-inch or 102 cm TV:

This means that the width of the screen of such a device will be 5.56 16 = 89 cm, and the height: 5.56 9 = 50 cm.

Similarly, you can calculate the dimensions for the 4: 3 format.

## Distance to TV depending on diagonal

Do not think that the larger the diagonal of the TV, the more comfortable it will be to watch.

If you buy a TV that is too large for a small room, your eyes will not be able to comfortably focus on the TV picture and will experience the unpleasant sensations of viewing too close, you will not have to talk about any pleasure in this case.

Also, it will not be convenient to watch TV of too small size, because then you will constantly have to peer and small details may pass your attention. You will not appreciate the painstaking work of the director and cameraman if you watch their product on a small screen with a low resolution.

There is a rule of optimal TV viewing distance, which is perfectly demonstrated by the table below:

At the intersection of the diagonal and display resolution, you can see the value of the recommended viewing distance in meters.

There is another method for calculating the optimal distance to the TV screen, which is easy to remember. this is the 5 diagonal rule. That is, the diagonal of your TV model just needs to be multiplied by 5 (do not forget to convert all values to centimeters). For example, a 40-inch TV should be installed at a distance:

40 inches is 102 cm: 102 5 = 5m and 10 cm from the viewing position.

For displays capable of playing FullHD or 4K video, the calculations can be done even easier:

The results will show the recommended distance in meters.

For HDTVs, the diagonal should be multiplied by 2.3. For example, if the TV model is 42 “, then we translate this value into cm = 107 and multiply it by 2.3 = 2m 46 cm.

Screen resolution is the number of matrix pixels per unit area. The larger this value, the better and clearer the image will be.

720p and 1080p signals are HD Ready formats. It can have a different resolution:

- 1280 × 720 dpi;
- or 1920 × 1080 pixels.

The first format is usually called Simple HD, and the second. Full HD, in order to share them among themselves. Such images are transmitted by satellite dishes, digital television, game consoles and licensed movie discs.

Ultra HD is a video format with a resolution of up to 3840 x 2160. Don’t confuse it with 4K, which has 4096 x 2160 pixels! This is the highest video standard available today.

Technology manufacturers are well aware of this difference, but often, for marketing reasons, advertise UHD TV models as 4K, so pay attention not to the name of the format, but to the declared picture parameters.

It is very important to get the right TV size. And it is better to define this parameter in advance. The tables in our article will help you understand how much distance should remain from the screen, and what diagonal and resolution is best for your home. Make your choice responsibly so that your purchase will bring you real pleasure and the opportunity to look at the world of cinema in a new way.