How does the Molar Mass Calculator work?

Molar mass = Σ (atomic mass × number of each atom) Then: Atomic masses from periodic table (in g/mol) Then: H=1.008, C=12.011, N=14.007, O=15.999, Na=22.990, Cl=35.453 Then: Used to convert between grams and moles: n = m/M.

Can you give an example of how to use the Molar Mass Calculator?

Example: Input Water (H₂O) gives a result of 2×1.008 + 15.999 = 18.015 g/mol.

Is the Molar Mass Calculator free to use?

Yes — completely free with no registration, download, or subscription required. All calculations happen instantly in your browser.

How accurate is the Molar Mass Calculator?

Our Molar Mass Calculator uses verified mathematical formulas and is accurate to multiple decimal places. Results are calculated in real-time using the same methods used by professionals.

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Molar Mass Calculator

Chemical Formula

A molar mass (molecular weight) calculator sums the atomic masses of all atoms in a chemical formula. Molar mass in g/mol numerically equals molecular weight in daltons (Da).

Symbol	Name	Unit	Description
M	Molar mass	g/mol	—
A	Atomic mass	u (atomic mass units)	—
n	Number of moles	mol	—

Compound	Formula	Molar mass
Water	H₂O	18.015 g/mol
Carbon dioxide	CO₂	44.010 g/mol
Sodium chloride	NaCl	58.443 g/mol
Glucose	C₆H₁₂O₆	180.156 g/mol
Ethanol	C₂H₅OH	46.068 g/mol

References

›Molar mass — IUPAC

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Common Compound Molar Masses

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