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Calculate molecular weight instantly with an element-by-element breakdown for routine stoichiometry and chemistry work.
Click any compound below to instantly calculate its molar mass
Type your chemical formula using standard notation (e.g., H2O, NaCl)
We identify each element and its count in the formula
Use conventional standard atomic weights from the project’s IUPAC 2021 reference table
Total molar mass is calculated with element breakdown
Tips for entering chemical formulas correctly
Use capital letters for element symbols. Two-letter symbols use lowercase for the second letter.
Ca, Na, Fe, Cl, MgWrite subscripts as regular numbers after the element symbol.
H2O, CO2, C6H12O6Write all elements in sequence with their subscripts.
NaCl, H2SO4, Ca(OH)2Get molar mass calculations in milliseconds with real-time updates
Uses the same conventional standard atomic-weight table as VerChem’s deterministic calculation engine
See contribution of each element with percentage breakdown
Perfect for learning chemistry and understanding molecular composition
Works directly in your browser, no downloads or sign-ups required
Deterministic formula sums from conventional standard atomic weights; isotope-specific and uncertainty-sensitive work needs an appropriate reference method
Molar mass 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 all atoms in the molecular formula.
Multiply the atomic mass of each element by its subscript (number of atoms), then add all the values together. For H2O: (2 × 1.008) + (1 × 15.999) = 18.015 g/mol
Molar mass (g/mol) and molecular weight (amu or Da) have the same numerical value but different units. Molar mass is mass per mole, while molecular weight is mass per molecule.
Molar mass is essential for stoichiometry calculations, converting between mass and moles, preparing solutions of specific concentrations, and understanding reaction quantities.
The result is a deterministic sum using conventional standard atomic weights from VerChem’s IUPAC 2021 reference table. It does not model isotope-specific composition or measurement uncertainty.