ASPECT RATIO
Calculate aspect ratios from dimensions, or scale dimensions from a ratio. Includes common presets for video, photo, and social media.
About the Aspect Ratio Calculator
This free online aspect ratio calculator helps you determine the proportions of an image or video, which is essential for photography, video editing, and web design. By entering the width and height of an image, the tool instantly calculates the exact aspect ratio (such as 16:9, 4:3, or 1:1) in its simplest form.
You can also use this tool to scale dimensions. If you have a target aspect ratio and know your desired width, the calculator will automatically find the corresponding height to maintain the same proportions without distorting the image.
We've included a list of common presets used across different platforms—from widescreen monitors (16:9) to Instagram portrait posts (4:5) and ultra-wide cinematic formats (21:9)—so you can quickly load the standard dimensions for your project.