CSS aspect-ratio & Padding Hack Calculator

Layout & Typography • 100% Client-Side Processing

Aspect ratio calculator. Generates modern aspect-ratio: 16 / 9 declarations as well as legacy padding-bottom percentage hacks for responsive video containers and cards.

Privacy First: CSS aspect-ratio & Padding Hack Calculator executes 100% locally in your web browser. No inputs or generated outputs leave your device.

Zero Server Transmission

Input Data

Output Result

Tool Chaining — Continue Workflow

Take your result from CSS aspect-ratio & Padding Hack Calculator directly into companion utilities:

Fluid Responsive clamp() Calculator CSS Responsive Layout & Media Query Generator

How to Use

Enter width and height (e.g. 1920 x 1080).
Copy modern aspect-ratio or legacy padding-top percentage.

Key Features

•16:9, 4:3, 1:1, 21:9, 9:16 presets
•Modern aspect-ratio property
•Legacy padding-bottom % hack for older browsers

Technical Scope & Limitations

• aspect-ratio property supported in all modern browsers since 2021.