How to Calculate Projector Screen Size

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How to Calculate Projector Screen Size

To enjoy a movie night or Netflixing, the majority of the people prefer projectors over ordinary televisions. The reason behind this is that projectors offer a large screen size. But how large can you get? Either you already have a projector or planning to get a new one, knowing the projector screen size is a must thing, man!

The listed measurements on the back are helpful but, it will become hard when you compare them. So how to calculate projector screen size? Before we tell you the way to calculate it, first read about the factors which play an important role in measuring the screen size.

Also Read: Top 8 Best Motorized Projector Screens for 2022

How You Can Calculate The Projector Screen Size?

The majority of the products have their size list at the back of the packaging in terms of dimension. In the case of projectors, you will see only a single list of screen sizes. The first step you have to take is to estimate the image size from the provided dimension’s data.

Furthermore, projector reflections and television are measured by diagonal. This calculation is the same that is used to screens themselves. So if you want to figure out which screen size will perfectly match your projector, all you have to do is, compare the screen with one another.

Generalize the Width and Length

Knowing only diagonal will not be enough in some of the situations. You might want to conclude out that what would be the best fit for the screen in your room. If you want to calculate the dimension of the screen from the screen size, then for this task, you have to go back to your school day’s geometry class.

Honestly speaking, this is going to be really complicated. You will need to draw a rectangular, and then break it into two right-angled triangles. In both right-angled triangles, the diagonal will assist as the hypotenuse. Everything is like the geometry class. You will need an angle and length of the hypotenuse to measure the dimension.

After this hustle, the projector’s point ratio will come out. This whole calculation will tell you the linkage between the height & width of the image (which is represented in the mathematical ratio). If your calculated ratio is 1:1, then this means that the height and width both are of the same size. Similarly, if the outcome ratio is 2:1, then the width is double the height.

The thing here that you need to notice is that different contentment has a different aspect ratio. The TV shows and HD movies have a 16:9 aspect ratio. So, if you want to enjoy a truly cinematic experience, then the 2.35:1 ratio is your need.

We know that everyone is not a genius at mathematics, so if you want to calculate the aspect ratio measurement, then you can easily calculate it online.

Had you heard About the Throw Ratio?

Contrasting with the television screens, the projector’s screen is not that fixed. The image’s size produced by the lamp of the projector will vary based on the distance between the screen and the lamp.

What is Throw Distance?

The simple and the easiest explanation of throw distance is that it is the distance between the projector and the screen (image). Increasing or decreasing the distance between the projector and the screen will obviously affect the throw distance. But the good news you can have is that the aspect ratio will not alter at all. In simple words, the length and width of the screen will change in the equivalent symmetry.

The general way of expressing throw distance is by “Decimal.” The calculation of throw distance is also very easy. Simply divide the image’s width with the distance, and throw distance is calculated.

Different Types of Throw Distance

Basically, there are two types of throw distance are present. Long-throw distance and short throw distance. Every projector has its own throw value which decides where the projector is needed to be placed to get a full-size view.

Long-throw needs to be placed at a distance from the screen to get a large image view with a non-pixelated image result. The long-throw projectors are usually used in auditoriums and cinemas.

While on the other hand, the short-throw projectors are placed near the screen with no concerns. But keep in your mind that you will need to have an extra lens if you desire to set a short-throw projector notably near the screen.

Both these types of projectors based on throw distance are best in their shoes. But the long-throw projectors are way cheap than the short-throw projector. Also, the long-throw projectors are better in performance.

So How to Calculate Projector Screen Size?

Well after this long discussion, you must have figured out that there are a few factors (mainly three) that play an important role in the calculation of the projector screen size.

Throw Ratio: Divide distance with the screen size to calculate throw ratio

Aspect Ratio: It is different for different content. For HD you need 16:9 and for cinematic you need 2.35:1.

Pythagorean TheoremSimply written as A2+B2=C2 or W2+H2=S2

We understand that it must seem complicated to you, but believe us it is not that complicated. Measure the wall and lens distance, multiply it with the throw ratio. Image width is calculated. Now use aspect ratio to calculated height, and then the Pythagorean Theorem to get the screen size.

As simple as this!


Don’t take this whole process as too complicated. A little bit of practice and patients will lead to calculate the right screen size of the projector.

Remember that arrangement of the projector will also affect the distance and the image size. Moving side-to-side or up down in connection to the screen will alter the angle. The best angle for large viewing is 30 degrees.

Lastly, ending this article with the hope that you must have figure out how to calculate projector screen size.


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