Calculate and resize dimensions by aspect ratio
Maintaining the correct aspect ratio is crucial when resizing images, videos, or designing responsive layouts. Our Aspect Ratio Calculator lets you enter original dimensions and then calculates the missing dimension when you change either the width or height, ensuring proportions are perfectly preserved. The tool also displays the simplified aspect ratio.
Quick-select buttons for common ratios like 16:9 (widescreen), 4:3 (standard), 1:1 (square), 21:9 (ultrawide), 9:16 (mobile portrait), and 3:2 (photography) make it easy to work with standard formats. This tool is invaluable for photographers, video editors, web designers, and anyone who needs to resize media while maintaining its visual proportions. All calculations happen instantly in your browser.