Capsule (geometry)

A two-dimensional orthographic projection of a capsule

A capsule (from Latin capsula, "small box or chest"), or stadium of revolution, is a basic three-dimensional geometric shape consisting of a cylinder with hemispherical ends.[1] Another name for this shape is spherocylinder.[2]

The shape is used for containers for pressurised gasses and for pharmaceutical capsules.


The volume of a capsule is calculated by the formula where is the radius of the cylinder and hemispheres and is the height of the cylindrical part.

The surface area formula is .[3]


  1. Weisstein, Eric W. "Capsule". MathWorld.
  2. Dzubiella, Joachim; Matthias Schmidt; Hartmut Löwen (2000). "Topological defects in nematic droplets of hard spherocylinders". Physical Review E. 62: 5081. doi:10.1103/PhysRevE.62.5081.
  3. "Capsule Calculator". Retrieved 2013-02-18.

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