Molar Mass Calculator

Calculate molecular weight from chemical formulas with element breakdown and mole-gram conversion.

Enter Chemical Formula

e.g. H2O, NaCl, H2SO4, Ca(OH)2

Chemical Formula

Molar Mass

Element	Count	Atomic Mass	Contribution	%

Mole ↔ Gram Converter

Moles

Grams

Element Breakdown

Molar Mass Formula

M = Σ(n_i × A_i)

M: Molar mass (g/mol)
n_i: Number of atoms of element i
A_i: Atomic mass of element i
Avogadro's number: 6.022 × 10²³

Related Calculators

Pro Tips

Use parentheses for polyatomic ions: Ca(OH)2, not CaOH2.

Element symbols are case-sensitive: Co (cobalt) vs CO (carbon monoxide).

Subscript numbers apply to the element immediately before them.