Calculate Molar Mass
Enter a chemical formula to calculate its molar mass
Use element symbols with optional numbers (e.g., C6H12O6)
Enter a chemical formula to see results
What is Molar Mass?
Molar mass is the mass of one mole of a substance, measured in grams per mole (g/mol). One mole contains Avogadro's number (6.022 × 10²³) of particles (atoms, molecules, or ions).
How to Calculate
Molar mass = Σ (atomic mass of element × number of atoms of that element)
Example: H₂O = (2 × 1.008) + (1 × 15.999) = 18.015 g/mol
Understanding Molar Mass
The molar mass of a substance is the mass of one mole of that substance. A mole is a unit in chemistry that represents 6.022 × 10²³ particles (Avogadro's number). This number is used because it allows chemists to count atoms, molecules, or ions by weighing them.
Common Molar Masses
Water (H₂O)18.015 g/mol
Table Salt (NaCl)58.44 g/mol
Glucose (C₆H₁₂O₆)180.16 g/mol
Carbon Dioxide (CO₂)44.01 g/mol
Ethanol (C₂H₅OH)46.07 g/mol
Sulfuric Acid (H₂SO₄)98.08 g/mol