Annulus (Ring) Area Calculator - Free, Instant, In Your Browser
Enter the outer and inner radius to calculate the ring-shaped area between them.
How to use Annulus Area Calculator
- 1Enter the required date(s) and details above.
- 2Click Calculate - Annulus Area Calculator runs instantly, right in your browser.
- 3Read your result below.
Your file is processed in your browser and is never uploaded.
Frequently Asked Questions
What's the formula?
Area = π × (outer radius² − inner radius²).
Is my data sent to a server?
No - everything runs entirely in your browser with JavaScript. Nothing is uploaded.