The Atomic Mass Calculator is a useful chemistry tool that helps you calculate the average atomic mass of an element based on its isotopes and their natural abundances. By entering the mass and percentage abundance of each isotope, the calculator instantly determines the weighted average atomic mass using the formula Σ(isotope mass × abundance) / 100. This tool is ideal for students, teachers, and chemists who want to understand how isotopes contribute to the overall atomic weight of an element as shown in the periodic table. Use this calculator to explore isotope composition, compare atomic masses, and enhance your understanding of atomic structure and chemical identity with accurate and quick results.