Aspect Ratio Calculator
Calculate the aspect ratio of any image or resolution. Reduce width by height to its simplest form for video, images and design. Free and instant.
Reduce any width by height to its simplest ratio, like 1920 by 1080 to 16 by 9, for video, images and responsive design. The calculation runs instantly in your browser, so you can check any resolution without entering values anywhere else.
How it works
What this calculator does
Reduce any width by height to its simplest ratio, like 1920 by 1080 to 16 by 9, for video, images and responsive design. The calculation runs instantly in your browser, so you can check any resolution without entering values anywhere else.
Why the math matters
The ratio matters because it keeps your video, images, and responsive layouts consistent across every screen size.
Frequently asked questions
What does an aspect ratio tell me?
It expresses width to height as a reduced ratio, such as 16 by 9, independent of the pixel count. A 1920 by 1080 image and a 1280 by 720 image share the same ratio.
How do I convert an image to a different aspect ratio?
Find the ratio you need, then resize or crop the image to match the width and height it implies, keeping the ratio locked so nothing stretches.
What is the aspect ratio of a common resolution like 1920 by 1080?
1920 by 1080 reduces to 16 by 9, the standard for full HD video. 1080 by 1080 is 1 by 1, and 1080 by 1920 is 9 by 16.