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Be2C is Fluorite structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Be2+ is bonded to four equivalent C4- atoms to form a mixture of edge and corner-sharing BeC4 tetrahedra. All Be–C bond lengths are 1.87 Å. C4- is bonded in a body-centered cubic geometry to eight equivalent Be2+ atoms.
BeC2 crystallizes in the tetragonal P4_2/mnm space group. The structure is one-dimensional and consists of two BeC2 ribbons oriented in the (1, 1, 0) direction. Be2+ is bonded in a linear geometry to two equivalent C1- atoms. Both Be–C bond lengths are 1.75 Å. C1- is bonded in a distorted linear geometry to one Be2+ and one C1- atom. The C–C bond length is 1.26 Å.