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Aspect Ratio Calculator

Simplify a ratio, solve missing dimensions and scale common formats.

Dimensions are calculated locally.

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What Aspect Ratio Calculator does

Keep media proportions accurate while calculating width, height, decimal ratio, orientation and scaled pixel dimensions.

Privacy and processing

Dimensions are calculated locally. Entered values remain in the current page session and are not included in analytics or monitoring.

How to use Aspect Ratio Calculator

  1. 1Enter whole-number width and height or choose a common ratio or dimension preset.
  2. 2Solve a missing dimension or scale by percentage, target width or target height.
  3. 3Copy the simplified ratio, decimal ratio and dimensions.

Common uses

  • Sizing a video thumbnail
  • Scaling a design proportionally
  • Checking portrait versus landscape orientation

Limitations

  • Rounded pixel outputs can differ by a fraction from the exact ratio.
  • Aspect ratio does not determine file size or image quality.

Frequently asked questions

How is a ratio simplified?

Whole-number dimensions are divided by their greatest common divisor.

Can I swap orientation?

Yes. Swapping exchanges width and height while keeping the same proportions.

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