In the title compound [Ca(C(12)H(25)O(4)S)(2)](n), the unique Ca(II) ion lies on an inversion center and is coordinated in a slightly distorted octa-hedral environment by six O atoms from dodecyl sulfate anions. The crystal structure is based on hydro-carbon (dodecyl sulfate) layers which sandwich the Ca(II) ions. Within the layers, the hydro-carbon zigzag chains are parallel to one another and inter-act via van der Waals forces.