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An aspect ratio is just a width to height comparison reduced to its simplest form, like 16:9 for widescreen video or 1:1 for a square post. This calculator takes any pixel dimensions, reduces them to the smallest matching whole numbers, tells you the closest standard format, and if you give it a new width it works out the exact height you need to resize to without stretching or squashing the image.
The simplified ratio is found using the greatest common divisor, the largest number that divides evenly into both the width and the height. Dividing both numbers by that value gives the smallest whole-number ratio that describes the same proportions. For example, 1920 and 1080 share a greatest common divisor of 120, so dividing both by 120 gives 16 and 9, the familiar 16:9 widescreen ratio.
16:9 is the standard for YouTube, widescreen video and most desktop monitors. 9:16 is the vertical equivalent used for Instagram Reels, TikTok and YouTube Shorts. 1:1 square still works well for Instagram feed posts and product photos. 4:5 is the tallest ratio Instagram's feed will display without cropping, which makes it popular for maximizing space in a scrolling feed. 21:9 is the ultra-wide cinematic ratio used in film and some monitor hardware.
To resize without stretching, the new height has to scale by the exact same factor as the new width. This calculator does that by multiplying your new width by the original height divided by the original width. If your source is 1920 by 1080 and you resize to a width of 800px, the matching height is 800 multiplied by 1080 divided by 1920, which comes out to 450px, keeping the 16:9 proportions intact.
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