Atomic Mass Calculator

The word “atomic mass” refers to the total mass of an atom relative to the mass of Carbon-12 isotope. Formerly, the atomic mass of an element was suggested in accordance with the Hydrogen atom but latter it was reconsidered and revised. The scientist suggested the C-12 as the best relative measure of the atomic mass. The term is often known as the “Mass Number of an element.” If we elaborate the term, atomic mass is actually the sum of the number of electrons and the number of neutrons in an atom multiplied with 1 amu.

Representation of Atomic Mass Calculator

The international representation of the atomic mass is “A”


According to the definition of the atomic mass, the mathematical representation will be

A = Number of protons + Number of neutrons


The SI unit of the mass number is “atomic mass unit (amu)” or “kilograms (kg)”

How to calculate the Atomic mass of an atom?

To calculate the atomic mass manually, you will have to find the total number of electrons and neutrons of that element and make the sum of their masses, you will get the total mass number of the element. For this, you have to remember the values of the masses of electrons and neutrons. We take electrons as it is equal to the number of protons, while neutrons are different in the isotopes of the elements.

Calculator use

Using the atomic mass calculator can prove to be helpful and time-saving for you. Put the number of neutrons and electrons or protons simply to get the values. No complicated calculations and values to remember. Get rid of putting the values manually and use this calculator for the future.