Molecular Weight Calculator

Calculate the molecular weight of chemical compounds by entering their molecular formula.

Enter a chemical formula (e.g., H2O, C6H12O6)

Chemical Formula

Example Formulas:

How to Use

Formula Format:

• Use element symbols (H, O, C, N, etc.)
• Add numbers after elements for quantity
• Examples: H2O, CO2, C6H12O6
• Case sensitive: use Ca not ca

Supported Elements:

All elements from H (Hydrogen) to Xe (Xenon) are supported with their standard atomic masses.

Common Compounds

C6H12O6Glucose

C8H10N4O2Caffeine

C9H8O4Aspirin

C2H6OEthanol

Understanding Molecular Weight

Molecular weight (or molecular mass) is the sum of the atomic weights of all atoms in a molecule. It's expressed in atomic mass units (amu) or grams per mole (g/mol).

Applications:

• Stoichiometric calculations
• Determining empirical formulas
• Converting between moles and grams
• Analyzing chemical reactions

Calculation Example

Water (H₂O):

• H: 2 atoms × 1.008 = 2.016 g/mol

• O: 1 atom × 15.999 = 15.999 g/mol

Total: 18.015 g/mol

This means one mole of water weighs approximately 18.015 grams.

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