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Aspect Ratio Calculator

Find the simplest width-to-height ratio.

Your inputs stay in your browser. No account required.
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How Aspect Ratio Calculator works

Reduces integer width and height by their GCD to express the simplest ratio.

Try an example

1920 × 1080 → 16:9.

Good to know

Positive safe-integer dimensions only. This is a numeric tool; no image is required.

Your privacy

Processing happens on this device for this tool. We do not upload your input, put it in share links or save it to your favourites. Closing this tab discards the working input; downloaded results remain wherever you save them.

When this tool is useful

Use Aspect Ratio Calculator when you need a quick, local result and want the rule or limitation visible alongside it.

How to use it

  1. Enter the input using the labels shown.
  2. Run the operation and review the result.
  3. Download or copy the result only after checking it.

Checks before you rely on the result

  • Positive safe-integer dimensions only. This is a numeric tool; no image is required.
  • Keep the original input when the operation creates a new copy.
  • Use the related tools below when the next step needs a different format.

This page is maintained with the tool implementation and its deterministic tests. If the result looks wrong, report the issue with a non-sensitive example.

Read the Aspect Ratio Calculator instructions

A useful next step

Batch Image Studio
Image Compressor
Image Resizer
Made for clarity. Built to be useful.Report an issue