4:3 Aspect Ratio Calculator

Created by Mariamy Chrdileli
Reviewed by Wojciech Sas, PhD candidate
Last updated: Aug 24, 2022

Welcome to the Omni 4:3 aspect ratio calculator, a simple tool you can use to resize your images or videos to match the 4:3 aspect ratio. Conveniently, this handy calculator also doubles as a 4:3 screen ratio calculator! 🖼️

Whether you're trying to match your files to the required 4:3 format for your project, or you're just a curious mind interested in exploring aspect ratios, you're at the right place. Come along to learn more about what is 4:3 aspect ratio, how to maintain a 4:3 aspect ratio when resizing your files, and what is 4 by 3 aspect ratio is known for.

What is 4:3 aspect ratio?

Aspect ratio is a proportional relationship between the width and height of an image or a video. Since different social media platforms often use different aspect ratios for imagery, being able to resize and adapt your pictures and videos to the required format can be very useful.

4 by 3 aspect ratio, also known as a standard fullscreen, is an aspect ratio representing a file that is four units wide by three units high. The 4:3 aspect ratio was the most utilized in movies and television until the development of widescreen HDTV, which now uses the 16:9 aspect ratio.

How do I calculate 4:3 aspect ratio?

Are you wondering how to calculate the 4:3 aspect ratio? It is pretty simple! To resize your files while maintaining the 4:3 aspect ratio, you can follow the next steps:

  • Take the height of your image and multiply it by 4/3 to compute the width; or
  • Take the width of your image and multiply it by 3/4 to compute the height.

You can use the abovementioned calculations to determine the 4:3 screen ratio as well! Don't want to do all the computations by hand? Don't worry; 4:3 aspect ratio calculator will do all the work for you!

Did you find the 4:3 aspect ratio calculator helpful? Come along for more aspect ratio-related tools:

  • Aspect ratio calculator;
  • CSS aspect ratio calculator;
  • Screen ratio calculator;
  • Portrait aspect ratio calculator;
  • Pixel aspect ratio calculator;
  • 16:10 aspect ratio calculator; and
  • 16:9 aspect ratio calculator.


Is 4:3 aspect ratio a traditional TV display standard?

The 4:3 aspect ratio (also known as 1.33:1) is the traditional TV display standard that filmmakers used almost exclusively during the early days of cinema. Nowadays, the 4:3 aspect ratio is not typical anymore, and the 16:9 aspect ratio (standard widescreen) is a new default.

How do I calculate the 4:3 aspect ratio if I know the width?

To calculate the 4:3 aspect ratio if you know the width of the screen, in other words, to make sure that you get a screen that fits the 4:3 format:

  1. Take the width measurement and multiply it by 3/4.
  2. That's all; you have now computed the screen's height according to the 4:3 frame size.
Mariamy Chrdileli
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