Step-by-step instructions
- Enter or select Isotope 1 mass.
- Enter or select Isotope 1 abundance (%).
- Enter or select Isotope 2 mass.
- Enter or select Isotope 2 abundance (%).
- Tap Calculate.
- Review the result shown directly below the calculator.
Average Atomic Mass Calculator
Calculate weighted average atomic mass from two isotopes.
How to use the Average Atomic Mass Calculator
Calculate weighted average atomic mass from two isotopes.
What the inputs mean
- Isotope 1 mass
- Enter the requested weight or mass using the unit shown or a consistent unit.
- Isotope 1 abundance (%)
- Enter the percentage value requested by the calculator.
- Isotope 2 mass
- Enter the requested weight or mass using the unit shown or a consistent unit.
- Isotope 2 abundance (%)
- Enter the percentage value requested by the calculator.
Formula or calculation method
The calculator applies the standard mathematical relationship for the labeled inputs and returns the computed result automatically.
Example
Try entering realistic values for Isotope 1 mass and Isotope 1 abundance (%), then tap Calculate to see how the result changes.
How to understand the result
Use the result as an estimate based on the values you entered. For planning decisions, double-check that the input units and assumptions match your real situation.
Tip: Keep all values in compatible units and use values from the same time period when the calculator compares two amounts.