Abstract Herein, density functional theory is employed for the computation of structural, electro-magnetic and optical properties of the cubic SmXO₃ (X=Fe, Mn, Cr) compounds. Enthalpy of formation (H _f ) and tolerance factor (τ) were calculated to check the stability of SmXO₃ in the cubic structure. The spin polarized electronic band structure (BS) and density of states (DOS) demonstrate the metallic character of SmFeO₃ and half metallic ferromagnetic nature of SmMnO₃/SmCrO₃ compounds, where Sm-5f, Fe/Mn-3d and O-2p play a dominant role. Both materials are found to have magnetic nature and suggested for possible data storage applications. The calculated total magnetic moments for SmFeO₃, SmMnO₃ and SmCrO₃ are 8.85765, 8.99990 and 8.00002 μ _B, respectively. Optical properties are computed by computing the optical parameters like dielectric function ε(ω), optical conductivity σ(ω), reflectivity R(ω), refractive index n(ω), extinction coefficient k(ω) and absorption coefficient α(ω). The α (ω) spectrum reveals prominent peaks situated within distinct energy intervals: 7.9 to 9.02 eV for SmCrO₃, 7.4 to 8.7 eV for SmFeO₃, and 7.4 to 8.4 eV for SmMnO₃ compounds. This noteworthy observation points to the promising utility of these compounds in of ultraviolet range of optical devices and spintronic deices.