Molecular Weight Calculator

Calculate molar mass from chemical formulas

Chemical Formula

Use standard chemical notation. Examples: H2O, NaCl, Ca(OH)2, CuSO4·5H2O

What is Molecular Weight?

Molecular weight (also called molar mass) is the mass of one mole of a substance, expressed in grams per mole (g/mol). It's calculated by summing the atomic weights of all atoms in a molecule, multiplied by their respective quantities in the chemical formula.

How to Use This Calculator

Enter Formula: Type the chemical formula using standard notation
Use Proper Format: Follow chemical naming conventions (see examples below)
Calculate: Click "Calculate" to get the molecular weight
View Breakdown: See detailed analysis of each element's contribution
Quick Examples: Use the example buttons for common compounds

Formula Format Guidelines

Simple compounds: H2O, NaCl, CO2

With parentheses: Ca(OH)2, Al2(SO4)3, Mg(NO3)2

Hydrates: CuSO4·5H2O, CaCl2·2H2O

Complex compounds: K4[Fe(CN)6], [Cu(NH3)4]SO4

Key Features

✓ Comprehensive Database

Includes atomic weights for all elements

✓ Complex Formulas

Handles parentheses, hydrates, and complex compounds

✓ Detailed Breakdown

Shows contribution of each element

✓ Instant Results

Real-time calculations with high precision

Common Applications

Stoichiometric calculations in chemical reactions
Determining empirical and molecular formulas
Converting between moles and grams
Quality control in pharmaceutical manufacturing
Research and development in chemistry
Educational purposes in chemistry courses

Note: This calculator uses standard atomic weights as defined by IUPAC. For isotopes or elements with variable atomic weights, the most common values are used. Always verify critical calculations with current literature values.