Molar mass calculator

Molar mass calculator

Online calculator to estimate the molecular mass (M) of molecules. Enter the chemical formula and press the "ENTER" key. For example, for the urea molecule CH4N2O or CO(NH2)2.

The calculator handles a maximum of two different levels of parentheses. Be sure to enter the crystallization molecule at the end. For example, sodium sulfate pentahydrate CuSO4.5H2O or CuSO4(H2O)5 and press the "ENTER" key.

Consider the spelling of upper and lower case letters when indicating the chemical formula. For example: Cu would correspond to Copper and CU would correspond to Carbon and Uranium.

Chemical Formula:
No. atomsAtomRelative atomic massMass fraction Element mass
(g/mol)(%)(g/mol)
Molar mass (M): (g/mol)

What is molar mass and molecular mass?

The molar mass (symbol M) of a given substance is a physical property defined as its mass per unit amount of substance. Its SI unit of measurement is kilogram per mole (kg/mol or kg-mol-1). However, for historical reasons, the molar mass is almost always expressed in grams per mole (g/mol).

The molecular mass (symbol is mf), or also relative molecular mass or formula weight), is a quantity that indicates how many times the mass of a molecule of a substance is greater than the atomic mass unit.

Su valor numérico coincide con el de la masa molar. La masa molecular alude a una sola molécula, mientras que la masa molar corresponde a un mol (NA = 6,022 · 1023) de moléculas.