Isotope Abundance Calculator

Calculate isotope abundances, average atomic mass, or mass of individual isotopes using the weighted average formula.

Find *

Number of Isotopes

Isotope 1

Mass (amu) *

Abundance (%) *

Enter as percentage (e.g., 75.76)

Isotope 2

Mass (amu) *

Abundance (%) *

Enter as percentage (e.g., 24.24)

Show Steps

Significant Figures

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Isotope Abundance Result

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Isotope Abundance

Visual representation of isotope distribution

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Calculation Breakdown

Step-by-step isotope calculation

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Average Mass

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amu

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Major Isotope

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Highest abundance

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Abundance Range

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Min - Max

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Isotope Count

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Number of isotopes

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Isotope Abundance Formulas

Key formulas and relationships

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Isotope Abundance Tips

Understanding isotope abundance

📊 Chemical Disclaimer: This calculator uses standard isotope abundance calculations. Results are for educational purposes based on natural abundance data.