Aspect Ratio Calculator
Calculate scaled dimensions, simplify ratios, and preview standard formats for web, video, social media, and UI design.
Reference Guide
Understanding Aspect Ratios
An aspect ratio represents the proportional relationship between the width and height of an image, video, screen, or canvas — expressed as width:height. A 1920×1080 display and a 1280×720 display both share a 16:9 aspect ratio.
Scaling dimensions with a locked aspect ratio guarantees that media is never stretched horizontally or squished vertically, preserving natural geometry.
Formula for scaling: To find a missing height given a target width: Height = Width × (Ratio Height / Ratio Width).
Modern CSS: Web developers can now use the native aspect-ratio property in all modern browsers instead of the legacy padding-top container hack.
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Help & answers
Frequently Asked Questions
Can I copy the generated CSS directly into my project?
Yes. Every design generator outputs ready-to-paste CSS you can drop straight into a stylesheet or component.
Will the output work across modern browsers?
The generated CSS uses widely supported properties. For very old browser support, double-check vendor prefixes and fallback values for your target audience.
Does changing settings affect performance on my site?
Values like blur, shadow layers, or gradient stops are just CSS — performance impact is minimal and no different from writing the CSS by hand.
Can I save or share a specific design configuration?
Copy the generated CSS or the tool’s URL parameters (where supported) to preserve a specific look for later or to share with a teammate.
Important disclaimer: Alexonic Tools is completely free to use. There is no charge, and we do not save tool inputs or generated results. We value customer privacy and keep building and fixing each day. Always verify important financial, payroll, legal, tax, business, or production-code results before relying on them. If you see an issue, need a tool, or require an update, send feedback to the developer.