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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

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Chemistry

Molecular Weight Calculator

Compute the molecular weight (molar mass, g/mol) of a CHON-containing molecule from the number of carbon, hydrogen, oxygen, and nitrogen atoms in its formula, with an optional isotope-correction factor. Useful for routine stoichiometry on organic and biological molecules where C, H, O, and N dominate the elemental composition.

Carbon Atoms (C) (atoms)

Hydrogen Atoms (H) (atoms)

Oxygen Atoms (O) (atoms)

Nitrogen Atoms (N) (atoms)

Isotope Correction

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	Molecular Weight (g/mol)	Molecular Weight (g/mol)
What it does	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.	Compute the molecular weight (molar mass, g/mol) of a CHON-containing molecule from the number of carbon, hydrogen, oxygen, and nitrogen atoms in its formula, with an optional isotope-correction factor. Useful for routine stoichiometry on organic and biological molecules where C, H, O, and N dominate the elemental composition.