Ratio from dimensions
Find missing dimension
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Simplify any aspect ratio to its lowest terms, identify common ratios like 16:9, and calculate a missing width or height from a known ratio. Essential for video, design and print.
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An aspect ratio is simplified by dividing both sides by their greatest common divisor, so 1920x1080 becomes 16:9. The tool also names common ratios, shows the decimal form designers use in CSS, and renders a true-proportion preview box so you can see the shape at a glance.
Enter any ratio plus one known dimension to compute the other: a 16:9 video that is 1280 wide must be 720 tall. This is the fastest way to size thumbnails, embeds and exports without distorting your content.