What is Molar Mass?
The Molar Mass Calculator computes the molecular weight of a chemical compound based on its atomic composition. Molar mass (in g/mol) tells you how much one mole (6.022 × 10²³ particles) of a substance weighs.
Molar mass is essential for: converting between grams and moles, stoichiometry calculations, preparing solutions of known molarity, and determining empirical/molecular formulas.
Common molar masses to know: Water H₂O = 18.015 g/mol, Salt NaCl = 58.44, Glucose C₆H₁₂O₆ = 180.16, Ethanol C₂H₆O = 46.07, Sulfuric acid H₂SO₄ = 98.08, Carbon dioxide CO₂ = 44.01.
Formula
Molar Mass = Σ (number of atoms × atomic mass of each element)
Atomic masses: H = 1.008 | C = 12.011 | N = 14.007 | O = 15.999 Na = 22.990 | Cl = 35.453 | S = 32.065 | P = 30.974
Example — Glucose C₆H₁₂O₆: = (6 × 12.011) + (12 × 1.008) + (6 × 15.999) = 72.066 + 12.096 + 95.994 = 180.156 g/mol
How to use this Molar Mass Calculator?
1. Enter the number of atoms of each element in your compound. 2. Default is set to glucose (C₆H₁₂O₆). 3. See the molar mass and formula.
For compounds with elements not listed (S, P, Fe, etc.), calculate manually using atomic masses from the periodic table.