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Calculate dimensions from aspect ratios — 16:9, 4:3, 1:1, and more.
Calculate width or height from a given aspect ratio instantly. Enter any two dimensions to get the third, or pick from common presets like 16:9, 4:3, 1:1, 21:9, and 3:2. Useful for video, design, and responsive layouts.
The Aspect Ratio Calculator provides an instant way to scale and calculate image, video, and layout dimensions using standard aspect ratios or custom values. Running entirely in the browser as a free, lightweight utility, it requires no installation or account creation, making it quick to access for routine design and development tasks.
Good to know: This tool focuses strictly on calculating mathematical dimension values rather than modifying, cropping, or exporting actual media files.
Quickly calculate image or video dimensions and maintain proportions using common presets or custom ratios.
Open the Aspect Ratio Calculator tool
Navigate to the aspect ratio calculator page to begin your dimension calculations.
Select a common ratio preset
Choose from popular presets like 16:9, 4:3, or 1:1 to automatically set your desired proportions.
Enter your known width or height
Input a specific value into either the width or height field to calculate the corresponding dimension.
Review the calculated output dimensions
The tool instantly generates the missing dimension while maintaining the exact aspect ratio selected.
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