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The display aspect ratio (DAR) is the aspect ratio of a display device and so the proportional relationship between the physical width and the height of the display. It is expressed as two numbers separated by a colon (x:y), where x corresponds to the width and y to the height. Common aspect ratios for displays, past and present, include 5:4, 4:3, 16:10, and 16:9.
To distinguish:
- The display aspect ratio (DAR) is calculated from the physical width and height of a display, measured each in inch or cm (Display size).
- The pixel aspect ratio (PAR) is calculated from the width and height of one pixel.
- The storage aspect ratio (SAR) is calculated from the numbers of pixels in width and height stated in the display resolution.
Because the units cancel out, all aspect ratios are unitless.