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Aspect Ratio vs. Resolution: What Is The Difference?

Aspect Ratio vs. Resolution: What Is The Difference?

With the current technology, terms such as “aspect ratio” and “resolution” are often used as buzzwords.

These words are used commonly in the technological world, but oftentimes, consumers are left wondering what they actually mean.

While some may consider aspect ratio and screen resolution to be synonyms that mean the same thing, there are actually differences to separate the two.

With both words referring to the size of a picture, it can be pretty confusing to tell the differences apart.

Without a grasp of what these words mean, you may be walking into buying something blindly.

Having a good idea of what you are getting into can help you make informed decisions, and make you more satisfied with your purchase.

Aspect Ratio

difference 4:3 and 16:9 aspect ratio

Aspect ratio refers to the ratio of the sides in a shape.

Specifically for pictures, it’s a comparison of the horizontal length and the vertical length of the picture.

So, when it comes to using the term for projections and home theatres, it’s talking about the length of a picture being projected.

But how is a picture measured? It’s not by inches, but rather by pixels – the small dots used to create a moving picture.

The aspect ratio will take the ratio of the horizontal pixels by their verticals, which can give a general idea of how tall a picture is in comparison to its width, as well as how compressed the image may be.


There isn’t just one universal aspect ratio, but there are several that are very common.

The most common and recognizable aspect ratio is 16:9, meaning for every 16 pixels in the width, there are 9 for the height.

An aspect ratio of 16:9 creates a ratio of about 1.7.


Another fairly common aspect ratio is 4:3, with a ratio of 1.33.

In comparison to 16:9, the 16:9 picture is more compressed, with the picture being adjusted to be longer horizontally.

This is because while both pictures are 9 units in height, a 16:9 picture is 16 units in length, while a 4:3 picture is only 12 units.

Of course, these two aspect ratios aren’t the only aspect ratios in existence.

It’s important to look into the differences between 4:3 and 16:9, as well as other potential aspect ratios when setting up for projections.


beach view with different resolutions 8k 4k full HD SG

Resolution is the specific amount of pixels in the width and height of a projection.

Using the specific amount of pixels in the picture, resolution is another way to see the size of a picture.

It is written in a similar manner of aspect ratio: the number of pixels horizontally, then an ‘x,’ followed by the number of pixels vertically.

A commonly known resolution is 1920×1080, typically seen in computer monitors. However, this is just the tip of the iceberg.

Resolutions, realistically, can have any combination of numbers.

You may be familiar with terms such as HD, 4K, or 8K. All of these refer to resolutions, giving an indicator of the quality of the picture.

Remember: resolutions say the amount of pixels on a screen. HD, meaning High-Definition, is seen in resolutions such as 1280×720 (HD) or 1920×1080 (Full HD). HD has twice the linear resolution of Standard Definition (SD), although HD has quickly become the bare minimum for projection.

HD or Full HD

A resolution of 1280×720 is a grand total of 921,600 pixels. This was the benchmark for technology until 1920×1080, which raised the total pixels to 2,073,600.


4K is a term for a resolution where the horizontal pixels are 4,096 pixels.

Movies may vary in aspect ratio, so there is no set vertical requirement, so once the horizontal length is reached, the picture is now in “4K quality.”


8K is when an image has a resolution with a width of about 8,000 pixels.

While 8K pictures aren’t very common, especially in things such as home setups, 8K is the highest resolution defined by the Rec. 2020, which defines various aspects of high definition television.

Comparison Table

Why does having more pixels make the quality better? Having more pixels allows for more detail to be put into the picture, thus allowing for a clearer, more high-quality picture.

  Aspect Ratio Resolution
  • The width of the screen versus the height of the screen.
  • This gives the general shape, whether it is more of a square shape or rectangular shape.
  • It is a ratio
  • The number of pixels that makes up a screen, giving the horizontal length and vertical length.
  • It is a definitive number of the amount of pixels, where more pixels equals to a more clear image
Use cases Aspect ratio can show when an image is being displayed in widescreen, and if the size has been altered in any way More pixels creates a clearer image, which creates High Definition (HD), 4K, etc.
Examples 16:9, 16:10, 4:3, 1:1 1920×1080, 1280×720, 3840×2160

What is the difference?

men in a vest pointing a question mark

With both of these terms defined, it may seem that both of them just refer to the size of pictures. But what’s the actual difference between the two?

In a direct comparison: aspect ratio is the fixed ratio between the width of a picture and its height. Resolution is the number of pixels (units) in the picture, multiplying the width by the height.

Both terms refer to the size of the picture, with the resolution being how many pixels total the picture is using, and the aspect ratio describing the width/height of the pixels.

An aspect ratio is a fixed shape, compressing the image into a specific box. Changing the aspect ratio will change the pixels, which changes the resolution.

Alternatively, changing the resolution by changing the amount of pixels, will give a different ratio between horizontal and vertical lengths, thus changing the aspect ratio.

Resolution also changes the quality of the picture more drastically than aspect ratio.

While having a 4:3 ratio can look different than 16:9, the quality itself is still relatively equal, while a different resolution can make the quality more or less clear.

Consider the aspect ratio when resizing projections to avoid distorting the picture.

Resolution is for when you have decided on a specific aspect ratio, and how many pixels you want specifically to change the quality of the picture.

When thinking about a home project, think about what is most valuable to you.

A good rule of thumb is to get the highest resolution possible within the space you have, as it is fairly common to value quality pictures.

Wrap it up

With technology rapidly improving, it’s only a matter of time before 4K overtakes HD quality as the bare minimum benchmark for projecting pictures.

When looking for a good resolution, be sure to consider how many pixels you want or need and look for what can hopefully be the largest picture possible.

While looking for a good aspect ratio, it’s fine to play around and look for what is best for you.

Aspect ratio is more about preference, as many people opt for 4:3, citing it’s slightly compressed view as easier to see, or simply having a personal preference.

While 16:9 or 16:10 is the typical “standard,” there’s so much freedom that you can see what works well for you.

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