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Aspect Ratio Calculator

Review pixel width and height to determine the aspect ratio of an image.

How This Tool Works.

Our Aspect Ratio Calculator is a simple utility designed to help designers, video editors, and content creators quickly find the proportional relationship between any width and height. This tool helps you make sure that your images and videos are perfectly sized for any screen or platform.

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Using the tool is straightforward. You have two easy methods to find an aspect ratio:

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Select a Preset.

For convenience, you can choose from a dropdown list of popular and common sizes, including standard screen resolutions, social media image dimensions, and more. Selecting a preset will automatically fill in the width and height fields for you.

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Enter Custom Dimensions.

If you have a specific size in mind, simply type the width and height directly into their respective input boxes. The preset dropdown will automatically switch to "Custom Size."

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The tool will instantly calculate and display the simplified aspect ratio (e.g., 16:9) in the result area. For more technical applications, you can check the "Show decimal ratio" box to see the proportion relative to 1 (example., 1.78 : 1).

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The Equation.

The aspect ratio of an image or screen is the proportional relationship between its width and its height, written as Width:Height. To simplify a large ratio like 1920:1080 into its more familiar form, 16:9, we need to find the largest number that can divide evenly into both the width and the height.

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This number is known as the Greatest Common Divisor (GCD).

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The calculation follows these simple steps:

  1. First, find the GCD of the original width and height.

    • Divisor = GCD(Original Width, Original Height)

  2. Then, divide both original dimensions by this number.

    • Final Ratio Width = Original Width / Divisor

    • Final Ratio Height = Original Height / Divisor

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For example, for a standard HD screen (1920x1080):

  • The Greatest Common Divisor of 1920 and 1080 is 120.

  • Width: 1920 / 120 = 16

  • Height: 1080 / 120 = 9

  • This gives you the clean, simplified aspect ratio of 16:9.

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