Atom Calculator — Free Online Tool
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Atom Calculator

Calculate protons, neutrons, and electrons for any atom or ion

Formulas: Protons = Atomic Number (Z). Neutrons = Mass Number (A) - Z. Electrons = Z - Net Charge. (Leave charge at 0 for a neutral atom).
Atomic Properties

Calculation Results

⚠️ In physical chemistry, the Mass Number (A) is always a whole number representing the sum of protons and neutrons in a specific isotope. It differs from the "Average Atomic Mass" (decimal number) found on the periodic table.

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