Aspect Ratio Calculator

Enter width or height with a ratio (or use presets) to compute the missing side and CSS aspect-ratio.

Ratio preset

Ratio W

Ratio H

Width (px)

Height (px)

Edit width to solve height, or height to solve width (last edited field wins).

CSS

Visual

Example

16:9 at width 1920 → height 1080. CSS: aspect-ratio: 16 / 9;

Enter the known dimension. Changing width recomputes height; changing height recomputes width.

Yes in modern browsers. For older ones, use padding-top percentage tricks or fixed dimensions.