Aspect Ratio Calculator

It is an Aspect Ratio Calculator: it simplifies the ratio, finds the missing width or height, and calculates new dimensions or percentage scaling based on a specific ratio. It runs entirely in the browser with zero dependencies.

Yes: 12 common ratios such as 16:9, 4:3, 1:1, 21:9, 3:2, 2:3, 9:16, 4:5, 1.85:1 (cinema), 2.39:1 (scope), A4 and 5:4 can be selected with one click.

Yes, but only to read its dimensions: when you drop an image, the width and height are filled in automatically. The tool does not crop, convert, or let you download the image.

Yes. With one click, you can transfer the result to the Image Crop and Social Media Resizer tools.

No. Ratios such as 4:5 for Instagram and 9:16 for mobile are included in the list, but there is no drag-and-drop crop frame, letterbox/pillarbox filling, or platform-based preset; this is a calculator, not an image editor.