Aspect Ratio Calculator

Aspect Ratio Calculator, at aspectratiocalc.im, is a free tool for anyone sizing images, video or layouts. Enter a width and height and it shows the simplified ratio, the decimal, a common name like 16:9 HD and whether the shape is landscape or portrait, alongside a preview frame and the matching CSS aspect-ratio line. Change the width or height in the resize section and it calculates the other side. Presets cover 16:9, 9:16, 4:5, 1:1, 16:10, 4:3, 3:2, 5:4, 21:9, 2:1 and 32:9, each with typical uses such as Reels, Instagram portrait posts or ultrawide monitors. You can also drop in a JPG, PNG, WebP or GIF to read its real dimensions, which the browser does locally without uploading the file. No account is needed, and the privacy page says there are no analytics or ad scripts.