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Molecular Weight Calculator

Calculate the molar mass of a compound from its atomic composition, then find moles from a weighed sample. Perfect for stoichiometry problems and lab preparation of solutions.

Carbon Atoms (C) (atoms)

Hydrogen Atoms (H) (atoms)

Oxygen Atoms (O) (atoms)

Nitrogen Atoms (N) (atoms)

Sample Mass (g)

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Chemistry

Molecular Weight Calculator

Find the molecular weight of a compound by entering the number of carbon, hydrogen, oxygen, and nitrogen atoms. Useful for stoichiometry, solution preparation, and mass spectrometry interpretation.

Number of Carbon Atoms (atoms)

Number of Hydrogen Atoms (atoms)

Number of Oxygen Atoms (atoms)

Number of Nitrogen Atoms (atoms)

Isotope Type

Fill in the required fields to see your result.

Key differences

	Molecular Weight Calculator	Molecular Weight Calculator
Category	Chemistry	Chemistry
Inputs required	5	5
Result	Number of Moles (mol)	Molecular Weight (g/mol)
What it does	Calculate the molar mass of a compound from its atomic composition, then find moles from a weighed sample. Perfect for stoichiometry problems and lab preparation of solutions.	Find the molecular weight of a compound by entering the number of carbon, hydrogen, oxygen, and nitrogen atoms. Useful for stoichiometry, solution preparation, and mass spectrometry interpretation.