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Atomic Mass Calculator
Calculate the average atomic mass from isotopic abundances
Formula: Average Atomic Mass = $(M_1 \times \%_1) + (M_2 \times \%_2)$. Ensure that the total percentage of all isotopes equals exactly 100%.
Isotope 1
Isotope 2
Calculation Results
⚠️ The average atomic mass is the weighted average of all naturally occurring isotopes of an element. This is the decimal value commonly found on the periodic table beneath the element symbol.