Online Aspect Ratio Calculator
Enter width and height to get aspect ratio (e.g. 16:9) and the GCD-reduced ratio.
Frequently Asked Questions
- What is aspect ratio?
- The ratio of width to height (e.g. 16:9 for widescreen). Same ratio means same shape when scaled.
- What is GCD-reduced ratio?
- Width and height divided by their greatest common divisor so the ratio is in simplest terms (e.g. 1920×1080 → 16:9).
- Why use aspect ratio?
- For video, images, and screens: to maintain proportions when resizing or to match a target format.
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