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Aspect Ratio Calculator

Simplify a ratio and scale width or height to match it.

Tool inputs stay in your browser · optional AI search sends your query

How to use it (step by step)

  1. 1Fill in the boxes: “Original width”, “Original height”, “New width (optional)”, “New height (optional)”. Example numbers are already there so you can see how it works; replace them with yours.
  2. 2The result updates instantly as you type (on a phone it is below the boxes).
  3. 3The bold line is the main answer. Tap Copy next to any value to copy it.

Words to know

Aspect ratio (9:16, 4:5…)
The shape of an image: width compared to height. 9:16 is tall like a phone screen, 16:9 is wide like a TV, 1:1 is square.
Fraction / ratio
A fraction is a part of a whole (3/4 = three of four parts). A ratio compares two amounts (2:1 = twice as much).
Thumbnail
The small preview picture people see before they click a video.

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