CZ
CalcyZone
unit-converters Verified Precision Tool

Molar Mass Calculator

Calculate molar mass, molecular weight, and mass percentage breakdown from chemical formulas.

Chemistry & Stoichiometry

Molar Mass Calculator

Calculate molecular weight and elemental mass percentage breakdown from any chemical formula.

Total Molar Mass
18.015 g/mol
ElementSymbolAtomic WeightCountTotal MassMass %
HydrogenH1.00822.016 g/mol11.19%
OxygenO15.999115.999 g/mol88.81%

Mathematical Formula

Molar Mass = Sum of (Atomic Weight of Element times Element Count)

Overview & Explanation

Calculates total molecular weight and elemental mass percentage breakdown from standard IUPAC atomic weights.

How It Works

  • Parses chemical formula string using element symbol capitalization rules.
  • Multiplies atom counts by elemental atomic weights.
  • Computes total molar mass in grams per mole (g/mol).

Practical Applications

  • Chemistry lab solution preparation.
  • Stoichiometric reaction stoichiometry.

Worked Example: Molar Mass of Water (H2O)

Calculate molecular weight of H2O.

1

Hydrogen Mass

2 times 1.008 g/mol

= 2.016 g/mol (11.19%)
2

Oxygen Mass

1 times 15.999 g/mol

= 15.999 g/mol (88.81%)
3

Total Mass

2.016 + 15.999

= 18.015 g/mol

Frequently Asked Questions

What are the units of molar mass?
Molar mass is measured in grams per mole (g/mol).
Is the formula parser case sensitive?
Yes. Elements must start with a capital letter (e.g., Na for Sodium, NaCl for Sodium Chloride).