The Isotope Calculator computes the average atomic mass of an element using the formula Average Atomic Mass=∑(mi⋅fi)\text{Average Atomic Mass} = \sum (m_i \cdot f_i)Average Atomic Mass=∑(mi​⋅fi​), where mim_imi​ is the mass of each isotope and fif_ifi​ is its fractional abundance. By entering the masses and abundances of all isotopes, the calculator computes the weighted average. This tool is useful for chemistry students, atomic physics studies, and determining the standard atomic mass of elements.