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Annulus Area Calculator

Calculate the area between two concentric circles from their outer and inner radii.

Annulus area: -
Visual representation

Annulus Area Calculator diagram

The diagram updates with your entries and is illustrative, not necessarily drawn to scale.

Calculation explained

How this result was calculated

The formula, your substituted values, and the evaluated result are shown below.

The outer radius must be greater than or equal to the non-negative inner radius. The result uses square units.
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How the Annulus Area Calculator works

Calculate the area between two concentric circles from their outer and inner radii.

Formula

π × (outerRadius × outerRadius-innerRadius × innerRadius)

How to use this calculator

  1. Enter every measurement using one consistent length or angle unit.
  2. Select Calculate to evaluate the formula.
  3. Review the substituted values in the calculation explanation.

Interpretation and limitations

The outer radius must be greater than or equal to the non-negative inner radius. The result uses square units. Decimal answers are rounded for display; retain additional precision for subsequent calculations.

Geometry collection

This calculator belongs to the Plane Geometry section of the Math calculator library.

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