This study introduces a novel method for calculating the formulas of homologous series in chemical compound systems, including (Aa+ – Bb+ – Cc–) and {Zn2+ – Ge4+ – P3–}. The proposed approach is validated using experimentally documented compounds across multiple systems. The method provides a generalized formula structure, applicable to various chemical element systems, offering a valuable tool for predicting and analyzing homologous series in chemistry.