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Molecular Mass Calculator

Enter any chemical formula and instantly get the molar mass, elemental composition, percent by mass, atom counts, and moles-to-grams conversions.

IUPAC 2021 atomic weights · Supports parentheses, hydrates · All 118 elements

Enter formula using standard notation — e.g. H2O, Ca(OH)2, CuSO4·5H2O

Formula

Use capital letters for element symbols. Numbers follow symbols. Parentheses supported. Use · or . for hydrates (e.g. CuSO4·5H2O).

Mass (g) — for moles conversion optional

Moles — for grams conversion optional

Common Molecules

Molar Mass

Molecular Weight

—

g/mol

Elements

—

Formula—

Total atoms—

Unique elements—

Hill formula—

Conversions

Moles from mass—

Grams from moles—

Molecules (1 mol)—

Reference

Avogadro's N6.022×10²³

1 amu1.66054×10⁻²⁴ g