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Aspect Ratio Calculator

Simplify dimensions and calculate a proportional resize.

● Live results · Runs on your device · No sign-up

Your inputs

New height = original height × target width / original width.

Live results

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Result visualization

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Aspect Ratio Calculator guide

Simplify dimensions and calculate a proportional resize.

How to use this tool

  1. Enter Original width, Original height, Target width.
  2. Change a value to update the results and illustration. Check any validation message before using the output.
  3. Copy the results or download CSV. Reset restores the example values.

A worked example

1920 × 1080 simplifies to 16:9. At width 1280 the proportional height is 720.

How it works

New height = original height × target width / original width.

Frequently asked questions

How should I interpret the illustration?

It is a visual aid, not a replacement for the numeric output. Some charts compare values with different units, and those magnitudes are not directly comparable.

Can I use the result without checking the inputs?

Check units, signs, assumptions and rounding first. The tool cannot know whether the values you enter describe the real situation correctly.