How it works
A walkthrough, end to end.
- 1
Enter a chemical formula like H2O, C6H12O6, or Ca(OH)2.
- 2
The calculator parses elements and parentheses with multipliers.
- 3
See the molar mass in g/mol.
Reference
Molar mass
Sum of (atom count × atomic mass) for every atom. Uses 2019 IUPAC values.
Use cases
What you can do with this.
Lab solution prep
Find grams to weigh out for a target molarity.
Stoichiometry
Convert between moles and grams.
Chem homework
Verify molar masses for any compound.
Pharmaceutical
Compute molecular weight of drug compounds.
Polymer chemistry
Repeat-unit molar mass.
FAQ
Frequently asked.
Use a dot or asterisk: CuSO4·5H2O works.
Ignored — molar mass is independent of charge.
No. All math runs in your browser.
Compute the repeat unit, not the whole polymer.