Scale images and videos proportionally or find the simplified ratio for any dimensions.
Enter the original dimensions and a new width — the tool calculates the proportional height.
Enter the original dimensions and a new height — the tool calculates the proportional width.
Enter any width and height to get the simplified aspect ratio and decimal equivalent.
Common ratios — click to explore
The Aspect Ratio Calculator is an essential tool for web developers, designers, and content creators who need to maintain proper proportions when resizing images, videos, or designing responsive layouts. This free online calculator instantly determines missing dimensions while preserving the original aspect ratio, ensuring your visual content displays correctly across all devices and platforms.
Simply enter any two known values - original width and height, plus either a new width or new height. The calculator automatically computes the missing dimension to maintain perfect proportions. You can also convert between common ratios like 16:9, 4:3, 1:1, and custom ratios. The tool supports various units including pixels, inches, centimeters, and percentages, making it versatile for both digital and print projects.
Using correct aspect ratios is crucial for Core Web Vitals optimization. When images maintain their proper dimensions, browsers can reserve the correct space during page loading, preventing Cumulative Layout Shift (CLS). This improves your page speed scores and search engine rankings. The calculator helps you set accurate width and height attributes in your HTML, contributing to better SEO performance.
This tool is invaluable for creating responsive images, YouTube thumbnails, social media graphics, and video content. Whether you're optimizing images for different screen sizes or ensuring videos display correctly across platforms, maintaining proper aspect ratios prevents distortion and enhances user experience. The calculator saves time and eliminates guesswork in professional design workflows.
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