Aspect ratio calculator

How to use the Aspect ratio calculator

What does the Aspect ratio calculator do?

Reduce width and height to a simple aspect ratio; It applies this page-specific rule: width and height are converted to equal-scale integers and divided by their greatest common divisor.

Which inputs does this calculator use?

To reduce width and height to a simple aspect ratio, enter Width, Height; keep every value in the same example; select Calculate when the values are ready; Start with a familiar case covered by this rule - A 1920 by 1080 image reduces to 16:9 without changing its proportions - so the expected result can confirm the settings.

How should the calculator result be read?

For a result intended to reduce width and height to a simple aspect ratio, a 1920 by 1080 image reduces to 16:9 without changing its proportions; read height together with the original width rather than as an isolated answer, and confirm that its units or structure match the intended use.

What calculation does this use?

When the goal is to reduce width and height to a simple aspect ratio, width and height are converted to equal-scale integers and divided by their greatest common divisor.

Why might a real result differ?

When using the page to reduce width and height to a simple aspect ratio, an aspect ratio describes shape, not resolution or image quality.

Limits and accuracy

When using this calculator to reduce width and height to a simple aspect ratio, an aspect ratio describes shape, not resolution or image quality; the result is an estimate unless every source value is known; codecs, metadata, overhead, and variable bitrates can change an actual file; keep width until the output has been checked in its intended destination. For a repeatable check when you need to reduce width and height to a simple aspect ratio, record Width alongside the final output and selected options.