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Aspect Ratio Calculator

Calculate a matching width or height while keeping the same aspect ratio.

Matching width

1920 px

Simplified ratio

16:9

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How to use Aspect Ratio Calculator

  1. 1Choose Find Width or Find Height.
  2. 2Enter the aspect ratio, or choose a common preset such as 16:9, 4:3 or 9:16.
  3. 3Enter the dimension you already know and use the matching calculated dimension.

Useful tips

  • •16:9 is common for widescreen video, while 9:16 is the portrait equivalent used for many vertical videos.
  • •A ratio describes proportion, not a fixed resolution. 1920×1080 and 1280×720 are both 16:9.
  • •If an app requires whole pixels, round the calculated dimension to the nearest pixel.

Frequently asked questions

What is an aspect ratio?

It is the proportional relationship between width and height, written as width:height. Keeping that relationship prevents an image or video from being stretched.

What does Simplified ratio mean?

For whole-number dimensions, Wid9et divides both sides by their greatest common divisor. For example, 1920:1080 simplifies to 16:9.

Does the calculator resize my image?

No. It calculates dimensions only. Use an image resize or crop tool when you need to change the actual file.