Aspect Ratio Calculator
Enter the original width/height and a new width to calculate the ratio-preserving new height and the aspect ratio. Handy for resizing images and videos — all calculations happen inside your browser.
Enter the values to see the result.
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New height
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Aspect ratio
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Scale
How to use
- Enter the original width and height.
- Enter the new width you want.
- The new height that keeps the ratio and the aspect ratio are shown.
Frequently asked questions
How do I resize while keeping the aspect ratio?
Enter the original width and height and a new width; the new height is calculated as original height × new width ÷ original width, so the ratio is preserved.
How is the aspect ratio shown?
It is shown as the reduced ratio divided by the greatest common divisor of the original width and height. For example, 1920×1080 appears as 16:9.
Are the values I enter sent to a server?
No. All calculations happen only inside your browser, and the values you enter are never sent to or stored on any server.