Wolfram|Alpha Octahedron Volume Calculators

Wolfram|Alpha has octahedron volume calculators. Solve volume problems related to regular octahedra, equilateral hexagonal prisms, small triakis octahedra, stellated octahedra, canonical 4-trapezohedra, triangular cupolas, tridiminished icosahedra, truncated octahedra and truncated tetrahedra.