The size of a screen is the result of the diagonal measurement and the screen’s aspect ratio. The aspect ratio is the ratio of the screen’s width to its height.

Whether you’re trying to figure out the dimensions of a TV or projector screen or figuring out the right computer monitor, the process for calculating screen size is the same.

The next step to finding screen size is to find the screen’s diagonal measurement. This is the measurement in inches from one corner to the opposite corner of the screen.

In most cases, this is clearly marked for a TV or projector screen. If it isn’t, use a tape measure and measure from corner to corner to get the measurement.

The screen width is equal to the aspect ratio width ARw times the screen diagonal divided by the square root of the aspect ratio width ARw squared plus the aspect ratio height ARh squared.

The screen height is equal to the aspect ratio height ARh times the screen diagonal divided by the square root of the aspect ratio width ARw squared plus the aspect ratio height ARh squared.

In some cases, a higher pixel density, or PPI, is the most important factor. So a smaller screen with a higher resolution might be better than a bigger screen.

A lot goes into determining the best viewing distance, and there are several different criteria you can use. Aside from size, things like resolution and even how strong your eyesight is can affect how you see the screen. Because everyone"s eyesight is different, this is less an exact science and more of a general guide based on scientific principles of vision and resolution.

That doesn"t mean you should be sitting a foot away from your TV. Having the largest screen possible isn"t always ideal. The human visual system has a total horizontal field of view of about 200 degrees, although a portion of that is peripheral vision. While it makes some sense to get as large a TV as you can for movies, not all content is made to fill the entire field of view. This becomes very apparent if you try to watch sports from up close while fixating on a single part of the screen, which quickly starts to feel nauseating.

The Society of Motion Picture and Television Engineers recommends sitting at a distance where the screen fills up a minimum of 30° of your field of vision for a good experience.

This is generally good guidance, but people who use their TVs mostly for watching movies might benefit from sitting a bit closer to get a more theater-like experience. The SMPTE "reference" position for movie theaters and the THX recommendation is about 40°. The minimum angle of vision works well for most usages, though, and sitting at a distance where the screen fills 30° of your horizontal field of view should be comfortable for most people.

Our size and distance tool above is based on the 30° guideline that is suitable for mixed usage, but you can find distances for a variety of sizes at 40° here.Learn more about the human visual field.

For instance, sitting close to a 1080p TV can look almost like watching through a screen door because you can see the individual pixels, even if it"s playing a high-quality 1080p HD movie. Increasing your distance to the TV also increases the density of details, producing a better image. Since 4k TVs have such a large density of pixels, it"s much more difficult for this issue to arise. You need to be quite close to a fairly large TV for the pixels to be noticeably distracting.

With 8k TVs, that density increases further, making it even harder to notice flaws with the resolution unless you"re sitting extremely close. However, this also decreases the point at which the perceived difference in picture quality becomes noticeable. Because the pixels are more densely packed with an 8k resolution, you need to sit closer to actually resolve those details. For that reason—content aside—8k only really makes sense if you want a really big screen and plan on sitting close to it. Learn more about the difference between 4k and 8k.

This chart shows the point at which an upgrade in resolution becomes worth it depending on size and distance to the TV. Each line represents the optimal viewing distance for each resolution, but any TV that falls within the range of that color will be suitable to notice a difference in picture quality. So, for example, if you have a 65 inch TV, the viewing distance at which the eye can actually process the details of 4k content is about 4 feet. However, any distance between 4 and about 8.5 feet will be enough to appreciate the difference between 4k and 1080p on a 65 inch TV. Go too far, and the image will look identical to 1080p HD.

The chart suggests that at a certain point, 4k UHD may not be worth the upgrade—if you"re sitting more than 7 feet away and have a 55" TV, for instance. Really, though, this chart is just a guide, and as 4k TVs have become the standard, the question of whether it"s worth it or not is a moot point. While your eyes may not be able to tell the difference at a certain point, your next TV will more than likely be a 4k TV anyway. Knowing the optimal viewing distance for the resolution can help you determine a living room setup that takes full advantage of your TV"s resolution, but since angular resolution is almost a non-issue with UHD content, we recommend using our calculator tool at the top of the page, which is based on the optimal field of vision.

You"re probably thinking something along the lines of "My couch is 10" away from my TV, which according to the chart means I need a 75 inch TV. This is insane!" It"s true that if you want to take full advantage of higher resolutions, that"s the ideal size you should get. That said, this may not be possible for everyone, which brings us to budget.

The price of a TV is usually exponential to its size. Size isn"t the only factor though, as resolution, panel type, and features all play into it as well. Looking at 65 inch TVs, for instance, an OLED like the LG CX OLED is inevitably going to cost more than a budget LED TV like the Hisense H8G, and both of these will seem downright cheap compared to an 8k TV like the Samsung Q900TS 8k QLED. Fortunately, though, as technology improves and the availability of higher resolution TVs expands, larger TVs have become more common and therefore more affordable. Feel free to compare the prices of our picks for the best 65 inch TVs, the best 70 to 75 inch TVs, and the best 80 to 85 inch TVs to really see the difference that size makes.

We recommend a field of vision of about 30 degrees for mixed usage. In general, we also recommend getting a 4k TV since lower resolution TVs are becoming harder to find. To easily find out what size you should buy, you can divide your TV viewing distance (in inches) by 1.6 (or use our TV size calculator above) which roughly equals a 30-degree angle. If the best size is outside your budget, just get the biggest TV you can afford. These are guidelines, after all, and since most TVs nowadays are 4k, you can"t really go wrong with the size that works for you, especially since picture quality also depends a lot on the content and viewing conditions. Ideally, you would optimize the capacity of your TV by getting one that"s large enough for you to notice all the visual detail that 4k has to offer, but ultimately, you should watch however feels most comfortable to you, whatever the size and distance may be.

Choosing the correct screen size is an important part of getting the best out of your home theater experience. Too close and you will be able to see the construction of the TV screen (the actual pixels), too far and you"ll lose the impact of the programs you"re watching.

In this section of the calculator you should enter the screen size (measured diagnally) into the box on the left and the calculator will provide you with the proper view distance on the right.

In this section of the calculator you can find the optimum TV size for your viewing area. Measure the distance from your viewing location to where you will place the TV and round off to the nearest foot. Enter that distance in the box on the left and the calculator will suggest an optimum TV size on the right.

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To determine what projection screen dimensions you will need based on a diagonal screen size use the projection screen size calculator below, this should be used for a general guideline for Projection Screens sizes, Plasma, LCD and LED Flat Panel

Displays diagonal screen sizes. Use this for both 4:3 and 16:9 aspect ratios; this is great for front and rear rigid projection screens and adhesive rear projection film screens sizes calculation.

Measuring your TV screen size isn"t hard, but there are things to consider before installing it in your room. Learn how to measure a TV screen the right way.

You can do this manually by getting a tape measure or, if you know the diagonal size, you can use a calculator to find out the width and height of the screen.

So, if you want to determine the size of your TV screen, you should measure from the top left corner to the bottom right corner. Or from bottom left to top right. It doesn’t matter which because it will be the same.

Some manufacturers may describe a TV’s size as a ‘class’ – so they might say it is a 55-inch class. This means that the screen measures 55-inches from corner to corner, including the frame, so the actual visible screen size will be slightly less.

Therefore, your measurements should include the bezel around the edge of the screen because this will give you a better idea of the exact size of the TV.

Although many modern TVs have extremely thin screens – especially OLED TVs – the back of the TV will always have a thicker section where the TV’s electronics live.

If you know a TV screen’s diagonal size, you can also work out the screen’s width and height by using a calculator, which will save you hunting around for a tape measure.

For example, you will get the TV screen’s width and height by entering the diagonal screen size. Or, enter the height, and you will get the diagonal and width dimensions.

You can also use this calculator to get your screen dimensions for different aspect ratios. Select 4:3 or 2.39:1 before entering a screen dimension, and you will get the correct lengths.

A flat-screen TV is measured diagonally from opposite corners of the visible screen, not including the frame around the edge. Although, some manufacturers do include the frame width in their specifications.

The best way to measure a TV without using a tape measure is to go to the manufacturer’s website and get the diagonal screen size for your TV model. Then enter the diagonal distance in a screen dimensions calculator to get the width and height.

A 55-inch TV is measured by finding out the length of the diagonal visible screen from corner to corner. So, take your tape measure and place it at the top left corner and measure down to the bottom right corner – ignoring the bezel that runs around the edge of the screen.

The PPI Calculator finds pixels per inch (PPI) and pixels per centimeter (PPcm). It will calculate PPI when inches are entered and calculate both PPI and PPcm when centimeters are entered.

PPI is a measure of pixel density or resolution of a computer screen, television screen or other display device. Pixels per inch or PPcm indicates how many pixels are in a 1 inch line or 1 cm line on a display. Also calculated are dot pitch, diagonal in pixels and total number in megapixels.

The number of pixels per inch or PPI tells you how many pixels are in a 1 inch line on a display screen. The PPI will be the same whether it"s a horizontal or vertical or diagonal inch because pixels are square and therefore symmetric. If a display does not have square pixels then this calculator does not apply.

You have a computer screen that is 1920 pixels wide by 1080 pixels high. The diagonal is 10 inches. You want to find the pixel density in one linear inch of display.

For example, let"s say you have a screen width equal to 1920 pixels and height equal to 1080 pixels. The ratio of width to height is 1920:1080. To reduce this to lowest terms we find the