Find the area of a ring from its outer and inner radii.
Free · Private · Runs in your browser
Math tool
Annulus Area Calculator
Find the area of a ring from its outer and inner radii.
Your result will appear here after you submit valid inputs.
Formula and method
This calculator applies area = π(R² − r²) to the values you enter. Calculations happen locally in your browser, and the displayed result is not a quote, diagnosis, or professional recommendation.
Boundaries
All values are entered directly in the browser.
The result is shown without intermediate display rounding.
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