Aspect Ratio Calculator
Find the simplified aspect ratio and resize while keeping proportions
Enter your original width and height to get the simplified ratio. Fill in a new width or new height to scale while keeping the ratio.
Aspect ratio & resizing
Find the simplified aspect ratio (like 16:9) of any width and height, and resize an image or video to a new width or height without distortion. Calculated locally in your browser.
FAQ
How is the ratio simplified?
By dividing both sides by their greatest common divisor — so 1920×1080 reduces to 16:9.
How do I scale to a new size?
Enter the original width and height, then fill in either a new width or a new height. The tool computes the missing dimension so the ratio stays exact.
Does it work for non-integer sizes?
Scaling does. The simplified ratio works best with whole-number dimensions like pixel sizes.