About Aspect Ratio Calculator
Ratios are reduced to their simplest whole-number form, so 1920 by 1080 reports as 16:9 rather than 1920:1080. Dimensions that reduce to something awkward like 137:96 are usually a sign the source was cropped rather than scaled.
Calculate a 16:9 (or any) aspect ratio and resize either width or height while keeping the ratio locked, so images and video never look stretched. The maths runs in your browser.
An aspect ratio describes the proportional relationship between an image or screen's width and height, written as two numbers like 16:9. This calculator reduces any width×height to its simplest ratio, and — with the ratio locked — lets you change one dimension to instantly get the other, so you can resize without distortion.
It is the quick way to work out dimensions for a video export, a social banner, a print at a fixed proportion or a responsive layout. Common presets — 16:9, 4:3, 1:1 and more — are one click away, and locking one side gives you the other without arithmetic.