Atomic Mass Calculator

Atomic Mass Number Calculator

Created by Team y2calculate

Content written by Jangir khan (PhD)

Coding by Marcelino 

Reviewed by Sajid khan (head of content)

Fact checked 🔍✓

Published: February 21, 2024

Table of Contents

Atomic Mass Number Formula

The formula to calculate the Atomic Mass Number (\(A\)) is:

\[ A = Z + N \]


  • \( A \) is the Atomic Mass Number,
  • \( Z \) is the Number of Protons in the atom, and
  • \( N \) is the Number of Neutrons in the atom.

Calculate the Atomic Mass Number (\(A\)) for an atom with \(Z = 20\) (number of protons) and \(N = 25\) (number of neutrons).


Using the Atomic Mass Number formula:

\[ A = 20 + 25 = 45 \]

Therefore, the Atomic Mass Number (\(A\)) is 45.

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