<p>The investigation of promising halide perovskites FrCaX₃ (Here X = Cl, Br, and I) was conducted utilizing the CASTEP code using GGA-PBE functional based on first principles DFT under varying hydrostatic pressure up to 200 GPa. Due to rising pressure, the lattice parameter of all three perovskites decreased due to the reduction in interatomic distances. FrCaX₃ demonstrated an indirect band gap when no external pressure was applied. Upon raising the pressure from 40 to 200 GPa, a direct band transition was observed, presenting potential benefits for solar or optoelectronic applications. The charge spilling parameter for FrCaBr₃ is lower than that of FrCaI₃ and FrCaCl₃ at hydrostatic pressure, indicating a strong electronic bond and all the perovskite materials show ionic bonding. As the pressure increases the covalence also increases as derived from Charge Density analysis or as known from the effective valence obtained from population analysis. It has been found that FrCaX₃ contains ionic as well as covalent character or bonding. Because of its greater absorption coefficient and low reflectance, it is fitting for UV and optoelectronic applications. The highest amount of energy loss occurs at ~ 35&#xa0;eV where reflectivity decreases drastically. The compounds have been shown to exhibit stability and ductility based on their elastic constants from 0 to 200 GPa pressure conditions. FrCaI₃ shows higher shear stiffness under hydrostatic pressure. The fracture resistance exhibited by FrCaI₃ is higher than that of FrCaBr₃ and FrCaCl₃. FrCaCl₃ exhibits superior machinability though FrCaBr₃ and FrCaI₃ also show good machinability. FrCaI₃ exhibits a greater degree of anisotropy. FrCaCl₃ exhibits a higher sound velocity because of the lower density at zero and under applied pressure conditions. FrCaCl₃ will conduct electricity more efficiently because of its higher Debye temperature. FrCaCl₃ exhibits a higher melting temperature.</p>