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Average Atomic Mass Calculator
Calculate the weighted average mass from isotopic abundances
Formula: Average Atomic Mass = $\Sigma (\text{Isotope Mass} \times \text{Relative Abundance \%})$. Ensure that the sum of all percentages equals exactly 100%.
Isotope 1
Isotope 2
Isotope 3 (Optional)
Calculation Results
⚠️ The values shown on the periodic table are the "Average Atomic Masses" of elements based on their naturally occurring isotopes. If calculating an element with only two isotopes, simply leave the Isotope 3 fields blank or at 0.