Molar Mass Calculator

Find Molar Weight of Compounds

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Calculating Molar Weight

  • Formula = > Weight

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Uses the formula of a reactant to determine molar mass.
Enter formulas with proper capitalization and unpack brackets. Examples:
CuCl2 => CuCl2
C12H22O11 => C12H22O11
(C6H5)3PCCO => C18H15PCCO

Symbol# AtomsNameAtomic #Molar MassTotal Mass
Na1Sodium1122.98922.989
Cl1Chlorine1735.4535.45
Total Mass 58.439
The molar mass of the molecule is:
58.439 grams/mol.

See also our theoretical yield calculator for chemical reactions (probably your next stop to finish the problem set).

Tool Overview: Molar Mass Calculator

What This Calculator Does and Why You Should Use It

Are you facing one too many chemistry problems sets tonight? Or trying to remember that last chemistry class (20 years ago) as you crunch through the math for a problem at work (or help your kid with their chemistry homework? Then this site is for you!

This particular calculator is a molar mass calculator for chemical reactions. You can use this calculator as part of solving for the theoretical yield of an experiment or process. We have an additional percent yield calculator which can help you translate this into predictions for actual experiments.

Other terms: formula weight calculator, molar weight calculator, molar mass of compounds calculator, molecular mass calculator

How Does The Molar Mass Calculator Work?

We take the formula you provide (NaCl - common table salt - in our default example) and unpack it into the component elements. Then we compare each atom against a table of the standard atomic weights for that element. We present the results in a table at the bottom of the molar mass calculator - it will show the count of atoms, the atomic weight of each element, and the molecular weight for the molecule.

We don't have brackets implemented (yet), so you will need to unpack any bracketed expressions. They don't affect the weight anyhow. Simply take each element and multiple it by the number of times the bracketed structure occurs. For example: (C6H5)3PCCO => C18H15PCCO

Bookmarking, Save, and Share Results

The tool is designed so you can flip between different parts of a problem set. We recommend you bookmark it so you can refer back to it. You can also share results with a study partner or tutor by hitting calculate and copying the URL for this page. When your study partner opens up the URL, they will see your calculations. It's easy share & save results via email. (Be sure to hit calculate first, however)

You also have the option of saving links to the calculations in your research notes files, so you can quickly re-open or check them later. Again - hit calculate first so the URL is updated with your most recent changes. Then copy and save the url.

FAQ - Molar Mass Calculator

What is Molar Mass in Chemistry?

Molar mass is an important concept in adapting chemical formulas to real world conditions. We may be able to balance a chemical equation and determine that one molecule of hydrogen combines with two of oxygen to make water (or the compound of your choice). But how would you set up the materials in the laboratory? Or if you were, for example, buying oxygen for a process, how would you determine how much to use to make a given quantity of water? Molar mass allows us to convert a chemical reaction into specific amounts of reagents required for the process. By converting the atomic interaction into grams, we can measure and use an appropriate amount of the necessary reagents.

How to find Molar Mass

Take a standard chemistry formula for a molecule, split it up into the component atoms, and look up the molar weight of each atom. Add the weight of the atoms in the molecule and you have the molar mass for the molecule.

Mathematics & Science Workbench

Chemistry: Percent Yield Calculator Theoretical Yield Calculator, Molar Mass Calculator

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Content: theoretical yield calculator

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