# Area of a Circular Ring (Annulus) Calculator

Posted by Dinesh onOnline geometry calculator to calculate the **area of the circular ring** (annulus) using inner and outer radius values.

## Calculate Area of Circular Ring using Inner, Outer Radius

### Formula:

Annulus = ? × (R - r) × (R + r)

where,R = outer radius,

r = inner radius,

? = 3.142857142857143