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pH Calculator

Convert hydrogen ion concentration [H⁺] in mol/L into a pH value using pH = −log₁₀[H⁺]. The standard measure of acidity used in chemistry, biology, environmental science, and any application where solution acidity matters.

H⁺ concentration (M)

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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

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Key differences

	pH Calculator	Molecular Weight Calculator
Category	Chemistry	Chemistry
Inputs required	1	5
Result	pH	Molecular Weight (g/mol)
What it does	Convert hydrogen ion concentration [H⁺] in mol/L into a pH value using pH = −log₁₀[H⁺]. The standard measure of acidity used in chemistry, biology, environmental science, and any application where solution acidity matters.	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.