Interactive tool
Aspect Ratio Calculator
Reduce width and height into a clean aspect ratio before cropping, resizing, or choosing a design canvas.
| Example | Input | Result |
|---|---|---|
| Full HD | 1920 x 1080 px | 16:9 |
| Square post | 1080 x 1080 px | 1:1 |
Workflow
Use Aspect Ratio Calculator in your sizing workflow
Reduce width and height into a clean aspect ratio before cropping, resizing, or choosing a design canvas.
Related
Related pages and tools
Nearby tools
More tools in the PixelMeasures toolkit
FAQ
Common questions
How do I calculate aspect ratio?
Find the greatest common divisor of the width and height, then divide both values by that number.
Why does aspect ratio matter?
If two sizes do not share the same ratio, resizing between them requires cropping, padding, or layout changes.
Can I share selected tool settings?
Some PixelMeasures tools keep selected presets in the URL fragment, so a shared link can reopen useful choices while the main tool page stays focused.
References
Sources and references
Aspect-ratio results are pure geometry based on the entered width and height; W3C CSS unit references support how dimensions are represented in web layouts.
-
W3C CSS Values and Units Module
Used for CSS unit definitions, absolute unit relationships, and CSS px behavior.
Last checked: 2026-05-01