Molar Mass Calculator
Enter a chemical formula to instantly calculate its molar mass (molecular weight), see the element-by-element breakdown, and visualise the percentage composition.
| Element | Count | Atomic mass | Contribution | % |
|---|
What is molar mass?
Molar mass (also called molecular weight) is the mass of one mole of a substance, expressed in grams per mole (g/mol). It equals the sum of the atomic masses of every atom in the chemical formula. For example, water (H2O) has a molar mass of about 18.015 g/mol because it contains two hydrogen atoms (2 × 1.008) and one oxygen atom (15.999).
How to use this calculator
Type or paste any valid chemical formula into the input field. The calculator handles:
- Simple formulas like NaCl, H2O, CO2
- Subscripts like C6H12O6 (glucose)
- Parentheses with subscripts like Ca(OH)2, Fe2(SO4)3
- Nested groups for complex compounds
Results update in real time as you type, showing the total molar mass, a per-element breakdown table, and a colour-coded composition bar.
Why is molar mass important?
Molar mass is essential for stoichiometry calculations, converting between moles and grams, preparing solutions of a given molarity, and balancing chemical equations. It appears in nearly every quantitative chemistry problem in NEET, JEE, and board exams.
Related tools
Explore our Interactive Periodic Table to look up individual element properties, or browse Chemistry memory tricks for exam preparation.