// multi-utility computation suite · offline · instant · precise
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math.geometry-annulus Calculator
Calculates the area of an annulus (ring) from outer and inner radii, and computes the average radius and width. Annular cross-sections appear in pipe walls, washers, and hollow cylinders — the area formula is simply π(R²−r²).
Inputs
R
Distance from centre to edge of a circle. Radius = diameter / 2.
R
Distance from centre to edge of a circle. Radius = diameter / 2.
Theta
Reference formula or conversion factor shown for context.
H
Vertical extent downward, or thickness of a layer. For tanks: affects pressure at the base (P = ρgh).
Results
annular area
The computed two-dimensional surface area.
perimeter
The total boundary length of the shape.
volume (× depth h)
The computed three-dimensional volume.
outer area
The computed two-dimensional surface area.
inner area (hole)
The computed two-dimensional surface area.
ratio outer/inner
The proportional relationship between two quantities.