Molar Mass Calculator

How to Calculate Molar Mass

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.

Enter any chemical formula such as H2O, NaCl, H2SO4, C6H12O6, or Ca(OH)2. The calculator supports parenthetical grouping and any element from the periodic table.

Why Molar Mass Matters

Molar mass is a fundamental concept in chemistry that bridges the gap between the atomic scale and the laboratory scale. It allows chemists to convert between the number of moles of a substance and its mass in grams, making it essential for preparing solutions, performing stoichiometric calculations, and analyzing experimental data.

For example, knowing that water (H2O) has a molar mass of 18.015 g/mol means that 18.015 grams of water contains exactly one mole, or approximately 6.022 × 10²³ molecules. This conversion factor is used constantly in quantitative chemistry.

Common Examples

• Water (H2O): 18.015 g/mol — two hydrogen atoms (1.008 each) plus one oxygen atom (15.999).
• Sodium chloride (NaCl): 58.44 g/mol — common table salt.
• Glucose (C6H12O6): 180.16 g/mol — a simple sugar used in cellular respiration.
• Sulfuric acid (H2SO4): 98.08 g/mol — a strong acid widely used in industry.
• Calcium carbonate (CaCO3): 100.09 g/mol — found in limestone and seashells.

Element-by-Element Breakdown

This calculator provides a detailed breakdown showing each element's atomic mass, the number of atoms, total mass contribution, and percentage composition. This information is valuable for understanding the composition of compounds and for gravimetric analysis calculations.