Aspect ratio calculator

Simplify a ratio and calculate proportional dimensions.

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How to use aspect ratio calculator

Enter original dimensions and a new width to calculate the matching height.

Things worth knowing

Dimensions must be positive whole numbers. The new height is rounded to the nearest pixel.

Is my input saved or uploaded?

Your input is processed locally and is not saved by this site. Reloading or leaving the page clears your work. Copy or download anything you want to keep. Only saved and recent tool IDs are stored on this device.

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