This aspect ratio calculator simplifies a width:height pair to its lowest ratio and scales dimensions proportionally.
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Aspect Ratio Calculator
Simplify an aspect ratio and compute proportional dimensions.
Calculator
About this calculator
Formula notes
Divide both dimensions by their GCD; to resize, height = width × (h/w) preserving the ratio.
Worked examples
- Example: 1920 × 1080 simplifies to 16:9, and resizing to width 1280 gives height 720.
- A 1920 x 1080 frame reduces to 16:9; keeping that ratio at 1280 px wide gives a height of 720 px.
How to use it
- Enter the width and height.
- Read the simplified ratio like 16:9.
- Enter a new width or height to scale proportionally.
Frequently asked questions
Is 16:9 the same as 1.78:1?
Yes. 16/9 ≈ 1.778, both describe the same proportion.
Why do resized images distort?
Changing one side without the other breaks the ratio; scale both together to avoid stretching.
Limits and interpretation
- Pixel aspect ratio and display aspect ratio can differ in some video formats, while this tool assumes square pixels.
- Cropping, letterboxing, safe areas, and responsive container constraints are not represented by proportional scaling alone.