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Also appears as a YouTube resolution option ("144p") [citation needed]. 160×144 (23k) 160 144 23,040 10:9 (effectively 4:3 (non-square pixels) on Game Gear) 2 bpp (6 bpp effective) HQVGA: Half Quarter Video Graphics Array Used with some smaller, cheaper portable devices, including the Nintendo Game Boy Advance. 240×160 (38k) 240 160 38,400 3:2
Since most digital hardware devices use dots or pixels, the size of the media (in inches) and the number of pixels (or dots) are directly related by the 'pixels per inch'. The following formula gives the number of pixels, horizontally or vertically, given the physical size of a format and the pixels per inch of the output:
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.