How do I use the Aspect Ratio Calculator?

Enter the original width and height to simplify the current aspect ratio. Type a new width or height to automatically calculate the matching dimension while preserving proportions. Use common presets like 16:9 or 4:3 to resize images, video, or layouts without distortion.

Is the Aspect Ratio Calculator free?

Yes, the Aspect Ratio Calculator is completely free. It runs entirely in your browser with no signup, no download, and no data sent to any server.

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calculator

Aspect Ratio Calculator

Enter width and height to simplify a ratio, then use presets or one known dimension to calculate the other side.

aspect ratio calculator16:9 calculatorscreen ratiodimension ratio tool

Dimensions to ratio

Simplify width and height

Width Height

Simplified ratio

16:9

Decimal ratio

1.778:1

Preview

16:9

1920 × 1080

Ratio to dimension

Calculate the missing side

Ratio width Ratio height

Known or target width Known or target height

Edit one dimension and the other updates automatically from the selected ratio.

Common presets

Quick switch

16:9 is the standard widescreen format used for videos, laptops, and TVs.

4:3 is common in older displays, presentations, and many retro games.

21:9 is an ultrawide format often used for cinematic edits and desktop monitors.

1:1 works well for avatars, thumbnails, and square social media posts.

9:16 is the vertical format used for stories, reels, and mobile-first video.

How to use

How to Use the Aspect Ratio Calculator

1 Enter the original width and height to simplify the current aspect ratio.
2 Type a new width or height to automatically calculate the matching dimension while preserving proportions.
3 Use common presets like 16:9 or 4:3 to resize images, video, or layouts without distortion.

The Aspect Ratio Calculator helps you simplify width to height ratios and instantly find matching dimensions for a new size. It is useful for video editing, image resizing, responsive design, and print layouts where accurate proportions matter.

Whether you need a 16:9 calculator, a screen ratio tool, or a quick way to scale dimensions, this online aspect ratio calculator gives precise results in seconds and works directly in your browser.

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