Calculate the missing value for a particular aspect ratio. This is useful, for example, when resizing photos or video. Simply add the actual size and the desired either a width or height to calculate the correct aspect ratio.
560 x 315 (Youtube)800 X 800 (Facebook Post Image)560 X 292 (Facebook Link Share Image)851 x 315 (Facebook Cover)170 x 170 (Facebook Profile Picture)1500 x 500 (Twitter Cover)
1334 x 750 (iPhone 6)1920 x 1080 (iPhone 6 plus)1136 x 640 (iPhone 5)1024 x 768 (iPad)960 x 640 (iPhone 4)
7680 x 4320 (8K UHDTV)5120 x 2880 (5K, iMac with retina screen)3840 × 2160 (4K UHDTV)2048 x 1536 (iPad with retina screen)1920 x 1200 (Widescreen computer monitor)1920 x 1080 (HD TV, iPhone 6 plus)800 x 600728 x 90 (Common web banner ad size)720 x 486 (PAL)640 x 480 (VGA)576 x 486 (NTSC)320 x 480 (HVGA)
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