Practical tools for measured work
Moles, atoms and electrons calculator
Convert mass, moles and particle counts or calculate isotope proton, neutron and electron counts.
Calculate the layout, check the diagram, then print the result for the shop or jobsite.
How it works
One mole contains exactly 6.02214076 × 10²³ specified particles. Moles = mass/molar mass; atom count = particle count × atoms per particle. For water, each molecule contains three atoms. For an ion, electrons = atomic number − signed charge; neutrons = mass number − atomic number.
Current-input example
The result above uses these exact values. This snapshot is included when the page is printed so the output can be checked against the original measurements.
- Particle calculation
- Mass and amount conversion
- Known amount
- Amount in moles
- Known amount value
- 1
- Molar mass
- 18.01528 g/mol
- Atoms per particle
- 3
Primary result: Amount in moles: 1 mol.
Before using the result
- Check the selected mode, units and input values before using the result.
- Read the assumptions and rounding rules; compare the worked example with your intended calculation.
- A numerical result does not supply missing context or change the stated limitations.
Limitations
Specify whether the particle is an atom, molecule or formula unit. Mass per particle is a mean when an average molar mass is entered. Mass number is an isotope integer, not rounded average atomic weight. Counts do not predict valence electrons, electron configurations or isotope stability.
Frequently asked questions
What should I verify before using this result?
Check the input values, units, dates and assumptions. Compare the method and its stated limits with the source relevant to your task.
Why might the finished result differ?
Results depend on the entered data and the model’s assumptions. Rounding, changing conditions or omitted factors can affect the comparison. Read the limitations before using the result.
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