Molar Mass Calculator – Molecular Weight from Chemical Formula Free
Calculate the molecular weight (g/mol) of any chemical compound by entering its formula – parentheses supported, element breakdown included, completely free.
Enter formula using element symbols (e.g., H2O, NaCl, Ca(OH)2, Fe2(SO4)3)
Common Elements
Results
What is this tool?
A Molar Mass Calculator is a free chemistry tool that computes the molecular weight (molar mass) of any chemical compound from its formula using precise atomic masses from the IUPAC periodic table. It solves the time-consuming task of manually summing atomic weights for complex molecules like C₆H₁₂O₆ or (NH₄)₂SO₄. Chemistry students use it for stoichiometry calculations, balancing equations, and converting grams to moles; teachers use it to prepare worked examples quickly; and researchers use it to double-check compound masses before lab work.