How to use the aspect ratio calculator

Start with the original width and height of your image or video. Then enter either a new width or a new height.

The calculator keeps the proportions intact and gives you the matching dimension, ratio, decimal value and CSS aspect-ratio rule.

Use presets such as 16:9, 1:1, 4:5 and 9:16 when you need quick formats for video, thumbnails or social media.