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Molecular Weight Calculator

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Result

Count Atom Molar Mass (g/mol) Subtotal Mass (%) Atomic Mass (g/mol)
Molecular Weight:
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Sarah Taylor

Sarah Taylor

Last Updated October 20 - 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 a molecular weight calculator?

A molecular weight calculator is a web-based tool that helps you to calculate the molecular mass of all kinds of chemical compounds - whether it's a simple compound consisting of two to three elements or a complex one, containing numerous elements.

In other words, You don't need to waste your time in calculating the atomic mass of each element present in the compound to calculate its molecular mass. Just insert the chemical formula of the compound and click on the calculate button.

 

What is molecular weight?

Molecular weight or molecular mass is the total weight of one molecule of a given substance. This chemical fraction is expressed in a special SI unit called Unified atomic mass unit (u). To calculate the molecular weight of a compound, let (ABC), the formula we usually use is as follows

The molecular weight of ABC = atomic mass of A + atomic mass of B + atomic mass of C

Thus, to get the right answer, you need to find out the atomic mass of all the elements(A, B, C) comprising your compound. However, while using our calculator, no such entity is required since the tool will do all the work for you and provide you with the most valid result in a few seconds.

How does our molecular weight calculator work?

Our molecular weight calculator uses the same formula to calculate the molecular weights mentioned above. We have stored the complete record of atomic masses of all the elements present in the periodic table. Thus, whatever the element or whatever the compound you insert in the search box, the tool will calculate its molecular weight by summing the atomic masses of constituent elements.

 

How to calculate molecular weight using this molecular weight calculator?

To calculate the molecular weight of the desired compound using this molecular weight calculator, you need to follow some rules as follows

  1. Pay special attention to the chemical symbols and atomic count of the element present in the molecule. For example, if you want to calculate the molecular weight of CaO, you need to write the exact chemical symbols by considering upper and lower cases thoroughly. If you write CAO or Cao instead of CaO, this calculator will not identify the compound.
  2. You can use the brackets while writing the chemical formula of your compound. If you are dealing with a complex compound, it is better to write its chemical formula with brackets as it is. Otherwise, you might change the atomic count mistakenly.
  3. Avoid using spaces and parenthesis since the calculator could not identify them. If you want to calculate the molecular weight of different compounds, it is better to write formulas for each compound one by one to make the process efficient and hassle-free.
  4. If you don't know the exact arrangement of elements in the formula of a given compound, you can type those elements disorderly. For example, if you type SO4Ca instead of CaSO4, the calculator will calculate the atomic masses of each element and add them up to give you an accurate answer. However, you should be certain about the atomic count, exact elements, and elemental symbols comprising the compound.
 

Result

As soon as you insert the chemical formula of the compound in the corresponding search bar, you need to press the calculate button. Resultantly, you will be directed towards a table, consisting of four columns. The table will show you the atoms, atomic count, molar mass of each atom in g/mol, and subtotal mass of each atom in %. In the end, the molecular weight will be written.

Why should you use this molecular weight calculator?

A molecular mass calculator saves your time since finding elements and noting down their atomic masses from the periodic table could take too much time. Similarly, since molecular weight fractions play a very significant role in stoichiometric calculations, this tool provides the utmost preciseness and efficiency so all the researchers, tutors, and students can use it to find accurate results.

This tool is very easy to use and the user doesn't need to possess a wide knowledge of software, web-based tools, and even chemistry. Just write the formula you are dealing with in the search box and click on calculate.

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