Atomic Mass Calculator



Count Atom Molar Mass (g/mol) Subtotal Mass (%) Atomic Mass (g/mol)

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Sarah Taylor

Sarah Taylor

Last Updated October 02 - 2021

I am a professional Chemist/Blogger & Content Writer. I love to research chemistry topics and help everyone learning Organic & Inorganic Chemistry and Biochemistry. I would do anything to spend vacations on a Hill Station.

What is an atomic mass calculator?

Atomic mass calculator serves as an online way to find out the masses of atoms of an element, present either in a free state or combined form. Using an atomic mass calculator saves you from the hassle of referring to periodic tables again and again or memorizing the atomic mass of each element.

Similarly, in this way, atomic mass calculators eliminate the chances of mistakes during chemical calculations.

What is atomic mass?

The atomic mass of an atom is the sum of all the subatomic particles present in it. As we all know, an atom consists of protons, neutrons, and electrons. Many other subatomic particles are also a part of an atom. Still, since their weight is almost negligible, we don't count them up while calculating the atomic mass of an atom.

Thus, the atomic mass is the total mass or weight of these three subatomic particles that constitute an atom. Knowing the correct atomic mass of all the elements constituting a compound is so crucial since it helps us to determine how an element would react to other elements? Similarly, atomic masses are also vital to sort out stoichiometric problems.

How does our atomic mass calculator work?

The atomic mass calculator is developed to store the complete data of the atomic mass and subatomic masses of all the elements present in the periodic table. Thus, whether you type a chemical formula for a compound like CaO, or type chemical symbol for a single element like Na, it will show atom count, molar mass, and subtotal mass of each atom individually (without summing them up).

Similarly, to calculate the mass of a molecule, you can use our molecular mass calculator that sums up the molar mass of all the elements and provides you with accurate molecular weight.

How to use this atomic mass calculator?

To use our atomic mass calculator, you have to follow the given steps

  1. Enter the chemical symbol of the element if you want to find the atomic mass. For example, to find the atomic mass of oxygen, write O.
  2. Enter the chemical formula of the chemical compound whereby you want to find the atomic mass of every constituent. Remember, you should focus on typing the accurate chemical formula by taking the uppercase and lowercase letters into consideration. For example, for NaCl, you cannot type NACL or nacl since the calculator will not detect it.
  3. You can add the coefficient and other numeral digits showing the number of elements in a compound as it is. There's no need to write any digit mainly as a subscript. For example, if you type H2O to calculate the molar mass of one mole of water, the calculator will show you the result without any problem.
  4. You cannot type more than one chemical formula or chemical symbol in the search bar. In other words, If you want to find the atomic masses of multiple compounds respectively, you need to calculate them one by one.
    For example, if you type chemical formulas for CO2 H2O in the search bar altogether, the calculator will not consider the space and see it as a single compound. Since not any compound possesses such a formula, it won't show any result.
  5. On typing the formula, click on the calculate icon. The calculator will head you towards a table showing elements present in the compound, the number of atoms of each element, molar mass, and subtotal mass.

Why use this atomic mass calculator?

Generally, a person has to memorize the number of neutrons, protons, and electrons of all the elements present in the periodic table. If we cannot remember these numbers, we cannot derive atomic mass. Thanks to the atomic mass calculator that eliminated this hassle as well. By entering the chemical symbols of the compound, you can get all these introductory details about that atom.

So, it's just a matter of clicking. Whether you are a student or a tutor, you can understand the behavior of an element and figure out the stoichiometric ratios just in a single tap.

How can you calculate the atomic mass of an element?

The formula that is generally used to calculate the atomic mass for an element is as follows

Atomic mass = number of protons + number of neutrons

A = n + Z

Here, A is the mass number, n is the number of neutrons, and Z is the atomic number (number of protons). For example, an oxygen atom possesses nine neutrons and eight protons. Thus, we put the values in the formula to find atomic mass, such as

A = 9 + 8

A = 17

To calculate the molecular mass, sum up the atomic masses of all the elements present in the compound. While adding up the atomic masses to find molecular mass, do not forget to consider the number of atoms of each element.

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