Throw Ratio Why do You Need That

What is A Throw Ratio?

What is a throw ratio, you ask? Are you someone who loves to tinker with your home theatre setup or help out with events that require projectors? If so, then you might have come across the term “throw or projector throw ratio before.” But what exactly is it, and why is it essential? 

In this post, we’ll dive deep into the world of projectors and help you understand the importance of throw ratios.

Throw Ratio Why do You Need That

Defining Throw Ratio

First things first, let’s define what a projector’s throw ratio is. Simply put, this refers to the distance between the projector and the screen, divided by the width of the projected image. It’s a crucial factor to consider when buying a projector or choosing the right lens for your setup.

Why Is it Important?

Well, it determines the size of the projected image, as well as the distance between the projector and the screen. Different projectors have different throw ratios, so it’s vital to know what is suitable for your needs. For example, a projector with a short throw ratio is perfect for small spaces. That said, a projector screen with long throw ratio is ideal for large venues such as auditoriums.

Throw ratios and Equiptment 

television, flat, panel and throw ratio's role in choosing equipment for screenings, home theaters


Another essential factor to consider is your projector lens type. Some projectors come with fixed lenses, while others have interchangeable lenses. Interchangeable lenses provide flexibility in throw ratio. This allows you to customize your setup according to your needs. Keep in mind, they can be quite expensive and require professional installation.

But even if it’s a portable projector, understanding it will go far in helping you set up the best configuration for viewing.


The screen width of a projector is the maximum width of the image it can project. This aspect is essential when considering the size of the screen you want to use. Understanding the projector’s native aspect ratio is crucial to determine the appropriate screen width. If the projector has a 16:9 aspect ratio, the matching screen size will need to have the same aspect ratio to avoid distortion. Projectors with a higher aspect ratio will require wider and more extensive screens. Consider the size of your room and the amount of space needed for the screen before picking a projector with the appropriate screen width.

This is an essential factor when it comes to projector placement in relation to the screen. Throw ratio can be long or short, and the choice depends on the space available. A long-throw projector will be ideal for projecting large images from a distance at an angle. It is perfect for large indoor or outdoor settings. Short-throw projectors, on the other hand, are ideal when mounting or placing the projector in smaller rooms. They can achieve a large screen size when placed closer to the screen, making them perfect for use in classrooms or smaller indoor settings.


When choosing a projector based on the screen width and throw ratio, you also need to consider the level of brightness needed. Brightness is measured in lumens, and the level you choose will depend on the amount of light in the room. A projector with a high level of brightness is ideal for use in a well-lit room or outdoor settings. Lower brightness levels offer better contrast, making them perfect for theaters or dark rooms.


The final aspect to consider when choosing a projector is resolution. This aspect determines how sharp and detailed the image will be. A higher resolution will provide a crisp and more defined image, making it ideal for business presentations and home theater use. Standard definition projectors provide a quality image but lack the sharpness of a higher resolution option.

Furthermore, throw ratio affects the image quality of your projector. If the ratio isn’t matched correctly, then the image may appear stretched or distorted. This is especially true if the screen size and projector are not the same.

Lastly, it’s worth noting that the throw ratio is not the only factor affecting image quality. Other factors such as brightness, contrast, resolution, and color accuracy also play an important role. But it is a crucial factor to consider as it will affect your overall viewing experience.

Knowing about throw ratio can save you money.

If you’re on a budget or want a simple setup, then a fixed lens projector is a better option. But remember to consider the throw ratio carefully. A higher throw ratio means the projector is further away from the screen. Likewise, a lower fixed throw ratio means it’s closer. Knowing this will help you choose the right projector for your room or event.

Placement dictates size

film projector, projector, presentation for home theater or outdoor theater and knowing throw ratio before purchasing

Again, the distance between zoom lens of the projector and the screen in relation to the width of the image being projected gives you the throw ratio. Thus, you need to know this before you chose your projector and determine where to place it.

How do you get the throw ratio?

Figure out your throw ratio by dividing the distance between the projector and the screen, in relation to the width of the image being projected. That calculation equals your throw ratio.


If a projector is placed 10 feet away from the screen and the image it projects is 5 feet wide, the throw ratio is 2:1 (10 divided by 5).

Because it determines the size range of the image that can be projected from given distance, it truly serves know it! After all, it’s the throw distance that determines the flexibility in projector placement and the potential screen sizes that can achieve.


Choosing the right projector can be a daunting task, and throw ratio is just one of the many factors to consider. But understanding what it is and its importance will save you from headaches and ensure a better viewing experience. Remember to consider the space you have, screen size, and budget when choosing a projector with the right throw ratio. Whether you’re a DIY tech enthusiast or a professional technician, knowing the significance of projector throw ratio will help you make informed decisions and improve your projector setup.

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