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Portrait Aspect Ratio Calculator

Created by Mariamy Chrdileli
Reviewed by Wojciech Sas, PhD
Last updated: Jan 18, 2024

Use this portrait aspect ratio calculator to resize your images or videos to adjust them to your project's portrait aspect ratio requirements.

Trying to fit aspect ratios of your portrait imagery or videos to different mediums can be challenging, but don't worry, you're at the right place. Read this article to learn more about what is the aspect ratio of a portrait photo, how to calculate the portrait aspect ratio (i.e., how to readjust the aspect ratio of a photograph or a video), and more! 👩‍🏫

What is the aspect ratio of a portrait photo or a video?

Let's start from the beginning - what is the aspect ratio? Aspect ratio is a relationship between the width and height of an image. We usually express aspect ratio with two numbers and a semicolon between them — for instance, 4:3. The concept is most prevalent in the film. However, understanding aspect ratios may come in handy for anyone who wants to fit their project's ratios in various mediums.

What about the aspect ratio of a portrait? Although there are no boundaries on how you can depict a portrait, you can always adopt certain video and photograph aspect ratios that are most common when taking portraits. Those aspect ratios are: 9:16, 2:3, 3:2, and the 4:5 (the latter two being standard photo ratios).

How do I calculate portrait aspect ratio?

To calculate portrait aspect ratios, in other words, to resize your files while maintaining portrait aspect ratio, you can use the following formula:

aspect ratio = width / height,


  • aspect ratio – The aspect ratio you're trying to adjust your file to;
  • width – Width of your file; and
  • height – Height of your file.

For instance, if you were trying to resize an image to fit a 3:2 (1.5) ratio, knowing it has a height of 500 px, you would multiply 500 px by 3/2 to get the width, which equals 750.

Don't want to perform all the above calculations by hand? That's where our handy portrait aspect ratio calculator comes in to assist!


Is 4:5 aspect ratio good for portrait photography?

You can find a 4:5 aspect ratio on vertical image and video formats; therefore, you can utilize this aspect ratio for portrait photography. 4:5 aspect ratio is also typical for micro four-thirds cameras and some film photographers.

How do I adopt my image to 2:3 portrait aspect ratio?

To adapt your image while maintaining a 2:3 portrait aspect ratio, you can follow the next steps:

  • If you know the height of your image, multiply it by 2/3 to get the required width.
  • If you know the width of your image, multiply it by 3/2 to get the required height.
Mariamy Chrdileli
Rectangles of various aspect ratios
Aspect ratio
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