We have reported an automated cavity calculation software, C3, deployed as a Python module, for the calculation of the cavity of cages, as well as aromatic contacts, solvent accessible surface area (SASA), hydrophobicity (MHP), and/or electrostatic potential (ESP) contributions. The main advantage of our method is its easy use and general applicability to a wide range of porous structures without the need for parameter adjustment. Users can select the grid spacing to achieve the desired cavity resolution and reduce calculation time by using larger grid spacing. The method was benchmarked on a wide range of cage structures.