Molecular Analysis

Molecular Weight Calculator

Enter any chemical formula to instantly calculate the molar mass (molecular weight) with a complete element breakdown.

Molecular Weight / Molar Mass

Use standard chemical notation. Subscript numbers as regular digits (e.g. H2O not H₂O)
Molecular Weight
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What Is Molecular Weight?

Molecular weight (also called molar mass) is the mass of one mole of a substance, expressed in grams per mole (g/mol). It is calculated by summing the atomic masses of all atoms in the molecular formula.

Formula: M = Σ (atomic mass × count) for all elements in the compound

How to Use This Calculator

  1. Type your chemical formula using standard notation (e.g., H2O, C6H12O6)
  2. Use uppercase for element symbols and numbers for subscripts
  3. Click Calculate to get the molecular weight and element breakdown

Supported Elements

This calculator supports all common elements found in organic and inorganic chemistry: H, He, Li, Be, B, C, N, O, F, Ne, Na, Mg, Al, Si, P, S, Cl, Ar, K, Ca, Fe, Cu, Zn, Ag, Au, Pb, Mn, Ni, Co, Cr, Se, Br, Kr, Rb, Sr, Mo, I, Ba, Pt, Hg, Sn, Sb, and more.