Enter width and height to get a simplified ratio (for example 16:9), a decimal ratio, common ratio names, and optional scaled dimensions for a target width or height.

How to use this tool

1. Enter the original width and height in pixels (or any consistent unit). 2. Optionally enter a target width or height to scale while keeping the ratio. 3. Click Calculate. 4. Review the simplified ratio and scaled dimensions in the results panel. 5. Use the output when resizing images or video frames. Processing runs on your device.

Worked example

Example: 1920×1080 simplifies to 16:9; entering a target width of 1280 px yields a height of 720 px.

How it works

Enter width and height in any unit. The calculator simplifies the ratio with the greatest common divisor, names common ratios like 16:9, and can scale to a target width or height while keeping the same proportions.

Limitations

Results are based on the inputs you provide and may not cover every edge case. This tool is for general use and is not professional advice.

Privacy and file handling

Your data stays on your device and is not uploaded.

FAQ

Frequently asked questions

How is the ratio simplified?

Width and height are divided by their greatest common divisor, so 1920×1080 becomes 16:9.

Is Aspect Ratio Calculator free?

Yes. It is free to use and you do not need to sign in or create an account.

Is my data private?

See the privacy note on this page. Many tools run on your device; some heavier file tools may use secure temporary processing when required.

Can I use Aspect Ratio Calculator on mobile?

Yes. Open this page on your phone or tablet, enter your inputs, and use the on-screen controls.

Page last reviewed: March 1, 2026

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