Aspect ratio calculator
Scale width and height while keeping the ratio locked.
Runs in your browserFree — no signup
How to use Aspect ratio calculator
Aspect ratio calculator helps you scale width and height while keeping the ratio locked with a live visual preview and copy-ready CSS, so you can go from idea to production code in one step.
Step by step
- 1Adjust the controls and watch the preview update live.
- 2Fine-tune values until it looks right.
- 3Copy the generated CSS.
- 4Paste it into your stylesheet or component.
What to expect
- Clean, modern CSS with no vendor bloat.
- A true-to-browser preview — what you see is what renders.
- Values you can keep tweaking without starting over.
Common use cases
- Prototyping a look before committing it to code.
- Checking colour contrast for accessibility compliance.
- Building a consistent design token set for a project.
Privacy & data
Everything runs locally in your browser. Your file is never uploaded to a server, so nothing leaves your device.
Frequently asked questions
Related tools — send your output onward