Image crop dimensions calculator

How to use the Image crop dimensions calculator

What does the Image crop dimensions calculator do?

Find the largest centered crop for a target aspect ratio; It applies this page-specific rule: the largest rectangle with the target ratio is fitted inside the source width and height.

Which inputs does this calculator use?

To find the largest centered crop for a target aspect ratio, enter Source width, Source height, Ratio width, Ratio height; keep every value in the same example; select Calculate when the values are ready; Start with a familiar case covered by this rule - The calculation reports pixel dimensions for a centered crop without upscaling - so the expected result can confirm the settings.

How should the calculator result be read?

For a result intended to find the largest centered crop for a target aspect ratio, the calculation reports pixel dimensions for a centered crop without upscaling; read ratio height together with the original source 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 find the largest centered crop for a target aspect ratio, the largest rectangle with the target ratio is fitted inside the source width and height.

Why might a real result differ?

When using the page to find the largest centered crop for a target aspect ratio, it does not choose the visual crop position or inspect important subjects near the edges.

Limits and accuracy

When using this calculator to find the largest centered crop for a target aspect ratio, it does not choose the visual crop position or inspect important subjects near the edges; the result is an estimate unless every source value is known; codecs, metadata, overhead, and variable bitrates can change an actual file; keep source width until the output has been checked in its intended destination.