Aspect ratio describes the proportional relationship between width and height — 16:9 for widescreen video, 4:3 for older displays, 1:1 for square social posts. This tool calculates the simplified ratio from any width and height, and also works the other way: given a target width and the current ratio, it computes the matching height to keep proportions consistent.
This is especially useful when resizing images, setting up video export dimensions, or designing UI elements that need to scale without distortion.
The ratio is automatically simplified to its lowest terms using the greatest common divisor, so 1920×1080 correctly reduces to the familiar 16:9 rather than showing an unreduced fraction.
Because everything runs locally in your browser, results appear instantly and nothing you type or upload is ever sent to a server.
Bookmark this page if you expect to use this tool regularly — it loads fast and behaves the same way every time, with no account needed.
This kind of task shows up constantly in everyday writing, coding, design, and admin work, which is exactly why a dedicated, focused tool saves so much back-and-forth.
A tool that does one job well, without a cluttered interface or unrelated features competing for attention, tends to be faster to use than a heavier all-in-one app.
If you find yourself needing this conversion or calculation often, keeping this page open in a tab is usually faster than digging through a bigger software suite's menus.
Because there's no sign-up or installation step, you can jump straight from search result to working tool in a couple of seconds.
This tool avoids unnecessary steps like account creation or email verification, since the underlying task itself is simple enough not to need them.
Unlike a heavier desktop application, there's nothing to download, update, or configure before you can start using this tool.
Because there's no sign-up or installation step, you can jump straight from a search result to a working tool in a couple of seconds.
Frequently asked questions
How is the ratio simplified?
The tool finds the greatest common divisor of the width and height and divides both by it, producing the simplest equivalent ratio.
Can I use this for print sizes too?
Yes, the same ratio math applies whether you're working in pixels for screens or inches/centimeters for print — just keep your units consistent.