Atomic Mass Calculator

Calculate the average atomic mass of an element using isotopic masses and natural abundances. Works for any element with multiple isotopes.

Element *

Number of Isotopes *

Show Steps

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Average Atomic Mass

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Calculation Breakdown

Step-by-step atomic mass calculation

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Atomic Mass

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g/mol

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Isotopes

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Number

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Element

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Symbol

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Most Abundant

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Isotope

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Isotope Contribution

Each isotope's contribution to the average atomic mass

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Atomic Mass Formulas

Key concepts for calculating atomic mass

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Atomic Mass Tips

Understanding atomic mass

📊 Scientific Disclaimer: This atomic mass calculator uses isotopic masses and natural abundances. Results are for educational purposes. Values may vary slightly from published atomic weights due to different isotopic compositions.