How does the Annulus Area Calculator work?

Area = π(R² − r²) Then: Where R = outer radius and r = inner radius Then: This is equivalent to π(R+r)(R−r) Then: The outer radius must be greater than the inner radius.

Can you give an example of how to use the Annulus Area Calculator?

Example: Input R = 10 cm, r = 6 cm gives a result of Area = π(100 − 36) = 201.06 cm².

Is the Annulus Area Calculator free to use?

Yes — completely free with no registration, download, or subscription required. All calculations happen instantly in your browser.

How accurate is the Annulus Area Calculator?

Our Annulus Area Calculator uses verified mathematical formulas and is accurate to multiple decimal places. Results are calculated in real-time using the same methods used by professionals.

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Annulus Area Calculator

Outer Radius (R)

Inner Radius (r)

Annulus = ring between two concentric circles. R must be greater than r.

An annulus is a ring-shaped region between two concentric circles. The annulus area calculator finds the area of this ring by subtracting the inner circle area from the outer circle area.

Symbol	Name	Unit	Description
R	outer radius	length	—
r	inner radius	length	—

Outer R	Inner r	Area
5	3	50.27
10	6	201.06
8	4	150.80
15	10	392.70

References

›Annulus — Wolfram MathWorld

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Annulus Area Calculator

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Annulus Area Calculator