The aspect ratio of a geometric shape is the ratio of its sizes in different dimensions.
Aspect ratio may also refer to:
Aspect ratio (aeronautics), the ratio of a wing's span to its mean chord Aspect ratio (image), the ratio of an image's width to its height Display aspect ratio, the ratio of a computer monitor's width to its height Pixel aspect ratio, the ratio ratio of a pixel's width to its height in a digital image Automotive engine aspect ratio, controlled by variable-geometry turbochargers