Aspect Ratio Calculator

Aspect Ratio Calculator — Resize Images Proportionally

The Aspect Ratio Calculator is a free online tool designed to help you resize images, videos, and design elements while maintaining their original proportions. Enter a known width and height, and the calculator instantly computes the aspect ratio (e.g., 16:9, 4:3, 1:1) and lets you calculate a new width or height while preserving the ratio. This eliminates the guesswork from resizing media assets and prevents the distortion caused by non-proportional scaling.Simply input your original dimensions, then provide either the desired new width or new height. The calculator instantly returns the complementary dimension that maintains the exact aspect ratio. The tool recognizes common standard ratios including 16:9 (widescreen), 4:3 (traditional), 21:9 (ultrawide), 1:1 (square), 9:16 (vertical/mobile), and 3:2 (photography). It also handles custom ratios, making it versatile for any use case.This calculator is essential for graphic designers preparing assets for multiple screen sizes, video editors converting footage between formats (e.g., YouTube 16:9 to Instagram 1:1), web developers creating responsive image containers, and photographers cropping prints to standard sizes. Social media managers rely on it to ensure profile pictures, cover images, and story dimensions meet platform requirements without distortion.Aspect Ratio Calculator is part of the facilita.tools collection of free design and development utilities. Available in Portuguese, English, and Spanish, it works on any modern browser and adapts to mobile and tablet screens.