Molecular Weight Calculator
Results:
Molecular Weight: – g/mol
Elemental Composition:
Examples:
- Water: H2O
- Glucose: C6H12O6
- Sulfuric Acid: H2SO4
- Methane: CH4
Molecular Weight Calculator | Fast, Accurate Chemical Formula Calculations
Calculate molecular weight instantly with our free online tool. Perfect for chemistry students, researchers, and professionals who need quick, accurate molar mass calculations for any chemical formula.
How to Use the Molecular Weight Calculator
- Enter your chemical formula in the input box (e.g., H2O for water or C6H12O6 for glucose)
- Click “Calculate” or press Enter
- View your precise molecular weight in g/mol
- See the detailed elemental breakdown showing each component’s contribution
Common Formula Examples:
- Water: H2O → 18.015 g/mol
- Table Salt: NaCl → 58.443 g/mol
- Glucose: C6H12O6 → 180.156 g/mol
- Sulfuric Acid: H2SO4 → 98.079 g/mol
Why Use Our Molecular Mass Calculator?
✅ Accurate results using IUPAC atomic weights
✅ Works with complex formulas including parentheses and subscripts
✅ Detailed composition breakdown showing each element’s contribution
✅ Mobile-friendly design works on all devices
✅ No registration required – completely free to use
Understanding Molecular Weight
Molecular weight (or molecular mass) is the sum of the atomic weights of all atoms in a chemical formula. It’s essential for:
- Preparing chemical solutions
- Stoichiometric calculations
- Pharmaceutical formulations
- Laboratory research
- Academic chemistry studies
Our calculator supports:
- Organic compounds (C6H6, CH3COOH)
- Inorganic compounds (NaCl, CaCO3)
- Simple elements (O2, N2)
- Complex formulas with multiple elements
Chemistry Resources
Frequently Asked Questions
Q: How accurate is this molecular weight calculator?
A: Our tool uses standard IUPAC atomic weights for maximum accuracy in chemical calculations.
Q: Can I calculate molar mass for hydrates?
A: Yes! Enter formulas like CuSO4·5H2O to calculate hydrated compound weights.
Q: Does this work for chemical equations?
A: This calculates single formulas. For reaction stoichiometry, calculate each compound separately.
Q: What if my formula contains parentheses?
A: Our calculator handles formulas like Al2(SO4)3 correctly, multiplying the contents.
Periodic Table Reference
For your convenience, here are atomic weights for common elements:
| Element | Symbol | Atomic Weight (g/mol) |
|---|---|---|
| Hydrogen | H | 1.008 |
| Carbon | C | 12.011 |
| Oxygen | O | 15.999 |
| Nitrogen | N | 14.007 |
| Sodium | Na | 22.990 |
| Chlorine | Cl | 35.45 |