Annulus Area Calculator
A free, browser-based calculator. Runs entirely in your browser — no sign up, nothing stored.
100% FreeRuns in your browserBasic
Enter Values
Enter your values and press Calculate to see results.
How to use this calculator
- Enter the outer and inner radius.
- Press Calculate.
How it works
Area of a ring = π × (outer radius² − inner radius²).
Worked example
outer 2 m, inner 1 m. ≈ 9.42 m².
Related tools
Tip: Enter any known values to calculate the remaining results.
All calculations run in your browser. Your inputs are never saved or transmitted.