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Free toolAll size converters

Aspect ratio calculator.

Enter a width and height to get the ratio, then a new width or height to get the other side at the same ratio. With common ratios and the CSS to copy.

Aspect ratio16:9
As a number
1.7778
CSS
aspect-ratio: 16 / 9;

Resize at this ratio

Free tool, no warranty, no liability. The result is produced automatically by a free tool from transjt.ai, nothing more. It can be incomplete or wrong. transjt.ai gives no warranty and accepts no liability for decisions or changes based on it; check every result before you use it.

How it works

Aspect ratio calculator in three steps.

  1. 01

    Enter width and height

    Or pick a common ratio such as 16:9 or 4:3.

  2. 02

    Read the ratio

    Reduced to its smallest numbers, with the nearest common ratio.

  3. 03

    Resize at the same ratio

    Type a new width or height; the other side follows.

  4. Try it with your build.

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FAQ

Questions and answers.

What people ask before they convert.

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  • Width and height are divided by their largest common divisor: 1920 × 1080 is divided by 120 and becomes 16:9. Sizes that don’t reduce neatly, such as 1366 × 768, show the nearest common ratio as well.

  • 16:9 for video and most screens, 4:3 for older screens and presentations, 1:1 for square social posts, 4:5 for portrait posts, 9:16 for stories and short videos, 3:2 for photos, 21:9 for ultrawide screens.

  • Set one side and the aspect-ratio property, for example width: 100% with aspect-ratio: 16 / 9. The tool writes the line for you.

  • New height = new width × height ÷ width. For 1920 × 1080 at a new width of 1280: 1280 × 1080 ÷ 1920 = 720.

  • Yes, with no sign-up and no limits.

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