Molecular Weight (Molar Mass) Calculator

Calculate the molecular weight (molar mass) of any chemical compound instantly with our free calculator. Simply enter the molecular formula and get accurate results using up-to-date atomic weights.

Supported elements: H, C, O, N, Na, Cl, and more.

How to Use the Molecular Weight Calculator

  1. Enter the molecular formula using proper chemical notation (e.g., H2O for water)
  2. Use capital letters for elements (Na for sodium, not NA or na)
  3. Add numbers after elements to indicate multiple atoms (CO2, not CO²)
  4. Click "Calculate" to get the molar mass in g/mol

Understanding Molecular Weight

Molecular weight, also known as molecular mass or molar mass, is the sum of the atomic weights of all atoms in a molecule. It's expressed in grams per mole (g/mol) and is essential for chemical calculations, including:

  • Determining quantities for chemical reactions
  • Calculating solution concentrations
  • Converting between mass and moles
  • Preparing laboratory solutions

Common Applications

Our molecular weight calculator is widely used in:

Academic Research

Students and researchers use it for laboratory calculations, chemical analysis, and reaction stoichiometry.

Industry Applications

Chemical engineers and technicians rely on molecular weight calculations for process optimization and quality control.

Features and Accuracy

  • Support for over 100 chemical elements
  • Up-to-date atomic weights from reliable sources
  • Results calculated to four decimal places
  • Instant calculations with real-time validation