I've been testing TVs for 9 years: Many still make a mistake when buying a TV

Anyone who is smart buys their TV one size larger. (Image: Maxe S., Gamestar)

I tell you something: If I could, I would pave a 100-inch oled TV on the wall at home. This does not work for various reasons, but it is mainly due to the fact that my postage is just empty.

When I look into the living room of friends and family, I see far too small TVs everywhere - and by that I mean everything below 55 inches. That is the common standard today.

Why do people still buy small TVs, although you could have a playful television that are often not even significantly more expensive?

Bigger is better

"There are no TVs too big" is one of my motto. Technically, this is also true. This is primarily due to the resolution.

Almost every television has a 4K resolution today.It allows sizes of up to 100 inches, without much loss, provided that you are watching films and series in 4K. This is because the human eye cannot recognize individual pixels in 4K resolution, especially not with moving images.

Many sit on the mistakeThat you have to sit further, the larger the TV. Due to the high resolution, we can sit relatively close to the screen. That also makes sense for me, I go to the cinema, precisely because the canvas is so big.

SeaSonythe recommended distance at 4K TVs is 1.5 times the screen height of the television (not the diagonal). That corresponds:

Size in inchesDistance in centimeters
4388,9
4999
5599
65119,4
75139,7
85160

Big displays are more immersive(If you don't sit 10 meters away) and even better for the eyes.

Due to the approximately even brightness of the display, a larger part of the field of vision is taken, soCNET. In short: the pupils are smaller and are set to the correct amount of light.

Smaller TVs make their eyes tired faster.The pupils are still open to see better in the dark, and an annoying, bright pixel (the TV) seems to you because you look straight in.

Bigger is often even cheaper

If you compare the price signs of any 55-incher with that of a 65-inch, then you notice: the larger television is increasingly expensive. Sure, he's bigger too.

However, this does not mean that you automatically pay more for the 65-inch TV.

It is often the case that the price per square centimeter for larger TV is lower.

As an example, I take the QLED TV Q60D from Samsung. This is a medium -class model from 2024. As the basis of my bills, I use the current road prices.

OnIdealit is offered in 55 inches by three providers for almost 620 euros. If I calculate the diagonal inch in the area in square centimeters, then I get 7.4 cents per square centimeter

The same TV is opened in your 65-inch variantIdealoffered out of three dealers for 760 euros. Here I only get 6.5 cents per square meter with my invoice.

Calculation and example

Click to open

This is how you calculate the price per square meter of a TV using the example of a 65-inch for 600 euros

First you calculate the screen diagonal in centimeters:65 inches x 2.54 cm/inch = 165.1 cm

Then you calculate the screen width and height.Note the aspect ratio of 16: 9. In the case of a 65-inch device, the formula looks like this:

  1. 165,1² = (16x)² + (9x)²
  2. 27258,01 = 256x² + 81x²
  3. 27258,01 = 337x²
  4. x² = 27258,01 / 337
  5. x = √(27258,01 / 337) ≈ 8,9281

It follows:

  • Width = 16 × 8.9281 ≈ 142.85 cm
  • Height = 9 × 8.9281 ≈ 80.35 cm

Now calculate the screen area.This results from: area = width x height

  • 142,85 cm × 80,35 cm = 11.478,07 cm²

You will receive the price per square centimeter, if you share the total price through the area: price per cm² = total price / area

  • 600 euros / 11,478.07 cm² ≈ 0.0523 € / cm²

The result corresponds to 5.2 cents per square centimeter.

All prices per square centimeter for all 6 available sizes based on the most offered price on Idealo.

  • 43 inches(500 Euro): 9,8 Cent pro cm²
  • 50 inches(620 Euro): 9,0 Cent pro cm²
  • 55 inches(620 Euro): 7,4 Cent pro cm²
  • 65 inches(760 Euro): 6,5 Cent pro cm²
  • 75 inches(1.170 Euro): 7,55 Cent pro cm²
  • 85 inches(1.510 Euro): 7,58 Cent pro cm²

To the result:From a relative point of view, the 65-inch version of the Q60D offers most of the picture for money. 75 and 85 inches are slightly more expensive than the 55-inch variant. The small customs sizes are most expensive.

What about expensive OLED TVs?Here, the prices ultimately increase more relatively to the size. I did the same bills with Samsung's OLED flagship from last year S95D and the result even surprised me.

  • 55 inches(1.600 Euro): 19,19 Cent pro cm²
  • 65 inches(2.250 Euro): 19,32 Cent pro cm²
  • 77 inches(3.200 Euro): 19,63 Cent pro cm²

Although the price jumps between the customs diagonals are much higher than with LCD, the price per square centimeter only increases slightly.

The bottom line can be saidthat common customs sizes are on average per square centimeter. The edges - very large or very small - are more expensive, even if the sales price does not reflect on it.

Important to know:The pure size says nothing about the image quality or the features.

The factor of the mother glass is also added to OLED. I summarized what that is in an article.

The limits of large TVs

I stick to it: bigger is better, but there are three individual factors that could be thwarted.

1. Content with low resolution

My imaginary 100-incher would look bombing as long as I would not use SD material. TVs have upcalers that collect bad images, but it also reaches its limits.

If I were to look at the 100-inch free TV, I could pass the time when I was having a pixel.

After all: Gigantic TVs cover their weaknesses.100 inches correspond to image diagonal over two and a half meters. The impression alone would provide open mouths. Whether the picture is perfect becomes a minor matter.

2. Back lighting

There are now relatively large and cheap TVs, but they have a problem: they save on the backlight and rely on EDGE LED. After all, more LEDs behind the panel cost more money.

A meager backlight means:

  • Contrasts are bad
  • Black values ​​are dog mandrel and therefore more gray than black
  • Image errors like screen clouding appear increasingly

OLED has no problems because each pixel shines individually. QLED or mini-LED TVs also do that better.

3. Platz

In addition to the empty postage, this is the reason why I don't hang a 100-inch TV in the living room: I simply lack space. This problem can only be solved if you build your facility around the giant TV or say goodbye to cupboards.

Every without a dedicated home theater room will reach its limits.

If you are looking for a specific TV for your needs,.

In the end, everyone has other needs.I continue to dream of my 100-inch oled and a win in the lottery, others are also happy with their 32-inch television. However, if someone asks me about the right size for the living room, I will continue to stay with my statement: there is no too big.

And the first to exchange his TV again because he is too big has to meet me.