AgCa crystallizes in the orthorhombic Cmcm space group. The structure is three-dimensional. Ca is bonded in a 7-coordinate geometry to seven equivalent Ag atoms. There are a spread of Ca–Ag bond distances ranging from 3.20–3.22 Å. Ag is bonded in a 9-coordinate geometry to seven equivalent Ca and two equivalent Ag atoms. Both Ag–Ag bond lengths are 2.91 Å.