Calculators toolsUpdated July 2026
Free Aspect Ratio Calculator
Calculate an aspect ratio, or find a missing width or height that keeps proportions, directly in your browser.
Free online tool
No signup
Instant results
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Aspect ratio: 16:9
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How to calculate an aspect ratio
- Enter a width and height to see the simplified ratio.
- Enter a target width to get the proportional height, or a target height to get the proportional width.
Common use cases
- Find the aspect ratio of an image or video
- Calculate the correct height when resizing to a target width
- Check whether two sets of dimensions share the same ratio
Frequently asked questions
Is this aspect ratio calculator free?
Yes. It is completely free, with no signup and no limits.
How is the ratio simplified?
Using the greatest common divisor of the width and height, the same way a fraction is reduced to its simplest form.
Can I use this for video or print dimensions too?
Yes — it works for any width/height pair, whether pixels, inches, or any other consistent unit.