CSS Aspect Ratio Calculator

Created by Wei Bin Loo
Reviewed by Wojciech Sas, PhD
Last updated: Jun 05, 2023

With this CSS aspect ratio calculator, we aim to help you figure out the CSS image aspect ratio so that you can quickly resize your files to fit in a designated area.

We have written this article to help you understand the definition of CSS maintain aspect ratio and the the CSS aspect ratio calculation. We will also demonstrate some examples to help you understand the calculation.

What is aspect ratio CSS?

CSS, or Cascading Style Sheets, is a style sheet language. It is often used for designing websites together with some markup languages such as HTML or XML.

CSS aspect ratio is the proportional relationship between the width and height of different screen sizes. It can also be interpreted as the aspect ratio for screen sizes. We usually describe it with two numbers and a semicolon between them — for example, 2:1. This means that the width of the image is twice its height. It's a very useful concept for resizing photos or videos for your blog or social media account.

How to calculate CSS image aspect ratio? CSS aspect ratio calculation

Assuming you are working on a CSS design for a website to fit on a screen size of the width of 16 in and height of 9 in. You can calculate the CSS aspect ratio in three steps:

  1. Determine the width and height of the screen

    In this example, the width of the screen is 16 in. The screen's height, on the other hand, is 9 in.

  2. Calculate the CSS aspect ratio

    The next step is to calculate the CSS aspect ratio by dividing the screen's width by the screen's height. The CSS image aspect ratio formula is as follows:

    CSS aspect ratio = width / height

    The CSS aspect ratio is the screen to design is 16 / 9.

  3. Determine the CSS aspect ratio of your screen

    Now, we can compare the CSS aspect ratio by comparing the number with the popular screen aspect ratio. The aspect ratio for the screen in this example is 16:9.

  4. Use the suitable aspect ratio for your designs

    The last step is to use this information in your designs!

Now that you understand how to calculate aspect ratio, we want to help you understand more about the topic. Hence, here are some calculators that are related to this topic:


How do I find the aspect ratio of my screen?

You can find the aspect ratio of your screen in three steps:

  1. Determine the width and height of the screen
  2. Divide the width by the height: aspect ratio = width / height
  3. Compare the result with the popular aspect ratios, e.g., 16:9, to determine which standard your screen follows

Can aspect ratio be negative?

No, the aspect ratio cannot be negative. This is because the aspect ratio is the result of the division of the height and width of the screen, which are both positive numbers.

What is screen size?

Screen size is essentially the number of pixels that we can display on your screen. It is usually displayed in inches. The higher the screen size, the more pixels can be displayed on the screen.

What is the aspect ratio of Apple iPhone 13 Pro?

The aspect ratio of the Apple iPhone 13 Pro is 19.5:9. This is the same as the aspect ratios of most versions of the Apple iPhone Pro.

Wei Bin Loo
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