In the context of the search for environment-respectful, lead- and bismuth-free chemical compounds for devices such as actuators, SnTiO 3 (ST) is investigated from first principles within DFT. Full geometry optimization provides a stable tetragonal structure relative to cubic one. From the equation of state the equilibrium volume of SnTiO 3 is found smaller than ferroelectric PbTiO 3 (PT) in agreement with a smaller Sn 2+ radius. While ionic displacements exhibit similar trends between ST and PT, a larger tetragonality (c/a ratio) for ST results in a larger polarization, P ST =1.1Cm −2 . Within ST analyzes of site projected density of states and chemical bonding indicate a reinforcement of the bond covalence with respect to Pb homologue. Both PT and ST exhibit anomalous large effective charges and the dielectric constant of ST is calculated larger than PT.