About the capsule calculator
A capsule (spherocylinder) is a cylinder capped by two hemispheres, as in pills and propane tanks. Its volume is a sphere plus a cylinder: πr²(4r/3 + a).
Formulas
| Volume | V = πr²(4r/3 + a) |
| Surface area | S = 2πr(2r + a) |
| Total length | L = a + 2r |
Frequently asked questions
How do I find the volume of a propane tank shape?
Treat it as a capsule: measure the radius r and the straight section a, then V = πr²(4r/3 + a).