How do I simplify a ratio like 1920×1080?

Enter the dimensions and it reduces them to their simplest form (in this case, 16:9), the same way you'd simplify a fraction.

Can I scale to a target height instead of width?

Yes, enter either a target width or target height and it calculates the other dimension to maintain the original ratio.

Does this work for both image and video dimensions?

Yes, the ratio math is identical regardless of whether you're scaling an image, a video frame, or any other rectangular dimension.

Does Aspect Ratio Calculator upload my files to a server?

No. Aspect Ratio Calculator runs entirely in your browser using on-device processing, your files never leave your device.

Aspect Ratio Calculator

Simplify an aspect ratio and scale dimensions to a target width or height.

Runs in your browser

Width×Height

16:9

Decimal ratio: 1.7778

Scale to width

About this tool

Scaling an image or video to a new size while keeping its proportions intact means solving a simple ratio calculation every time, and doing that math by hand for each new target size gets old fast, especially with non-round numbers. This tool simplifies an aspect ratio and scales dimensions to a target width or height automatically, handling the ratio math so you get the correct proportional dimensions instantly.

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