Calculate approximate atomic mass and mass number from proton and neutron counts.
Atomic Mass Calculator
How to use this calculator
Enter non-negative whole numbers for protons and neutrons, then choose among all reference mass units.
- Choose the calculation mode and units, when available.
- Enter values using the localized examples in the placeholders.
- Select Calculate and review the result, steps, and SVG visualization when provided.
Formula and method
Calculate approximate atomic mass and mass number from proton and neutron counts.
Worked example
The placeholders provide a reproducible example. Enter them to verify the result before using your own data.
Assumptions and limitations
Values must be finite and use compatible units. Displayed decimals are rounded, while calculations retain full precision.
Frequently asked questions
What does this calculator do?
Calculate approximate atomic mass and mass number from proton and neutron counts.
Why do fields appear or disappear?
Dependent fields follow the selected method, shape, ingredient, or unit mode.
Are all visible formulas semantic?
Yes. Formulas and structured results use native MathML, with text retained only for labels and copying.