Enter width and height to get the aspect ratio (e.g. 16:9), or enter a ratio and one dimension to get the other. Useful for video, images, and responsive design.
Aspect ratio Calculate
Aspect ratio: —
Calculate dimensions from ratio
About Aspect Ratio Calculator
An aspect ratio is the ratio of width to height (e.g. 16:9 for widescreen). This tool lets you find the ratio from dimensions, or find width or height when you know the ratio and one side. All calculations run in your browser.
Frequently Asked Questions
What is aspect ratio used for?
Aspect ratio is used in video (16:9, 4:3), images, and responsive design (e.g. maintaining ratio when resizing). Social platforms often specify dimensions (e.g. 1200×630 for OG images).
Is my data sent to a server?
No. All calculations happen in your browser. Nothing is uploaded.