Annulus Calculator

Use our online inner and outer circle calculator to calculate the inner and outer circumference of an annulus, surface area of inner circle and outer circle and annulus. Annulus is a ring-shaped object bounded by two concrete circle with the same center. Area of the annulus is the difference between the areas of the outer and inner circle of radius. Enter the radius of inner and outer circle in the below annulus calculator to find the resultant value.

Use our online inner and outer circle calculator to calculate the inner and outer circumference of an annulus, surface area of inner circle and outer circle and annulus. Annulus is a ring-shaped object bounded by two concrete circle with the same center. Area of the annulus is the difference between the areas of the outer and inner circle of radius. Enter the radius of inner and outer circle in the below annulus calculator to find the resultant value.

Code to add this calci to your website

Just copy and paste the below code to your webpage where you want to display this calculator.

Formula:

i = 2 × π × r₂ o = 2 × π × r₁ a = π × r₂ × r₂ b = π × d × r₁ s = π × ((r₁ × r₁)-( r₂ × r₂)) Where, i = Inner Circumference of an Annulus o = Outer Circumference of an Annulus a = Surface Area of the Space Enclosed by the Inner Circle b = Surface Area of the Space Enclosed by the Outer Circle s = Surface Area of the Annulus r₂ = Radius of Inner Circle r₁= Radius of Outer Circle