In materials synthesis research, understanding the lattice parameters is crucial for determining the phase and evolution of a material's microstructure. Crystal Lattice is user-friendly, free software designed to calculate the lattice parameters of the seven crystalline systems using one or more X-ray diffraction (XRD) planes. Developed in an accessible programming environment like Visual Studio, this program employs analytical methods to calculate the lattice parameters. To use the software, users need to input the diffraction angle (2θ) and the Miller indices (hkl); with this information, the program determines the lattice parameters. Additionally, Crystal Lattice can calculate the crystallite size based on the diffraction angle (2θ) and the full width at half maximum (FWHM). The software validation used information from the ICSD (Inorganic Crystal Structure Database) crystallographic card of different chemical compounds. The data was processed using the equation corresponding to each crystal structure. The results were compared with the information provided in the ICSD crystallographic card data, obtaining a mean error of 0.059%.