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.
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.