Compute molar mass from a chemical formula with a per-element breakdown.
Molar mass is the sum of the atomic weights of all atoms in a formula unit. Atomic weights are weighted averages of naturally occurring isotope masses, published by IUPAC. The calculator parses parentheses recursively (e.g., Ca(OH)₂ = Ca + 2×O + 2×H), handles subscripts, and supports hydrate dot notation (CuSO₄·5H₂O).
Molar mass
Molar mass = Σ (number of atoms of each element × atomic weight of that element)
H₂O: 2 × H (1.008) + 1 × O (15.999) = 2.016 + 15.999 = 18.015 g/mol.
Type "CuSO4.5H2O" using a period as the dot separator. The calculator splits on the dot, applies the coefficient 5 to H₂O, and adds up all atoms: Cu + S + 4O + 5×(2H + O) = 249.685 g/mol.
"CO" is carbon monoxide (C + O), while "Co" is cobalt. "NO" is nitric oxide (N + O), not nobelium. Capitalising only the first letter of each element symbol is essential.
All 103 stable and well-characterised elements through Lawrencium (Lr=103), using IUPAC 2021 standard atomic weights. Transactinides (Z > 103) are not included.