Molar Mass Calculator

Calculate molecular weight and element composition from any chemical formula instantly.

Frequently Asked Questions About Molar Mass

What is molar mass?

Molar mass is the mass of one mole of a substance, measured in grams per mole (g/mol). It's numerically equal to the molecular weight of a compound. For example, the molar mass of water (H₂O) is 18.016 g/mol.

How do you calculate molar mass?

To calculate molar mass:

  1. Identify each element in the chemical formula
  2. Find the atomic mass of each element
  3. Multiply atomic mass by the number of atoms
  4. Sum all the values

Example: H₂O = (2 × 1.008) + (1 × 15.999) = 18.015 g/mol

Can this calculator handle complex formulas?

Yes! This calculator handles:

  • Simple compounds (NaCl)
  • Parentheses (Ca(OH)₂)
  • Multiple parentheses (Ca₃(PO₄)₂)
  • Hydrates (CuSO₄·5H₂O)
  • Large organic molecules (C₆H₁₂O₆)

Why do I need to know molar mass?

Molar mass is essential in chemistry for:

  • Stoichiometric calculations (determining reactant/product amounts)
  • Preparing solutions with specific concentrations
  • Understanding chemical reactions
  • Laboratory work and experiments
  • Academic chemistry courses

What units can I get results in?

This calculator provides results in three units:

  • g/mol - Grams per mole (standard)
  • lb/mol - Pounds per mole (US customary)
  • kg/kmol - Kilograms per kilomole (metric)

Is this calculator free to use?

Yes! This molar mass calculator is completely free and requires no registration. Calculations are performed instantly in your browser.