Molar Mass Calculator

How to calculate molar mass

1. Type a chemical formula, such as H2SO4, Ca(OH)2 or CuSO4·5H2O.
2. The molar mass appears in g/mol as you type.
3. The table shows the number of atoms, mass and mass percent of each element.

Frequently asked questions

How do I write a hydrate?

Put a dot or an asterisk before the water: CuSO4·5H2O, CuSO4.5H2O and CuSO4*5H2O all work.

Is element case important?

Yes. Co is cobalt, while CO is carbon monoxide. Write the first letter of each element in uppercase and the second in lowercase.