📐Aspect Ratio Calculator

Calculate aspect ratio and resize dimensions from width and height in pixels

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Aspect Ratio Calculator — How to Use

Enter width and height in pixels to calculate the aspect ratio and find the closest standard ratio (16:9, 4:3, 1:1, etc.). Enter a new width or height to instantly calculate the scaled dimension while maintaining the original ratio.

16:9 is the standard for YouTube, Full HD, and 4K. 4:3 is the classic TV and presentation format. 1:1 is the Instagram feed square. 9:16 is for Reels, Shorts, and TikTok. 21:9 is CinemaScope ultra-wide.

Maintaining the aspect ratio when resizing prevents distortion. In Photoshop, enable "Constrain Proportions." In CSS, use the aspect-ratio property to lock proportions automatically.

Frequently Asked Questions

What is the difference between 16:9 and 16:10?

16:9 is the standard widescreen ratio for YouTube and TV. 16:10 is used by some laptops (e.g., MacBooks). Video production uses 16:9 as the standard.

How do I resize an image while keeping its ratio?

Use the "Convert by New Width" or "Convert by New Height" feature in this tool, or enable "Constrain Proportions" in Photoshop.

How do I lock aspect ratio in CSS?

Use the CSS aspect-ratio property, e.g., aspect-ratio: 16 / 9; This automatically maintains the element's proportions.