Calculate aspect ratios, scale dimensions while preserving ratio, or find missing width/height. Perfect for designers, video creators, and web developers.
How to use this tool
Get Ratio — enter width and height to find the simplified aspect ratio (e.g. 1920×1080 = 16:9).
Scale to New Size — enter original dimensions and a new width to get the proportionally scaled height.
Find Missing Side — enter a ratio and one dimension to calculate the missing side.
Click any preset in the Common Ratios section to load it instantly.
This aspect ratio calculator is useful for graphic designers resizing images and mockups while maintaining proportions, video editors setting up timelines and exports, web developers sizing responsive images and containers, social media managers preparing images for different platforms, photographers cropping images to standard ratios, and anyone who needs to maintain consistent proportions when resizing visual content.