Molar Mass Calculator

Calculate the molar mass of any chemical compound from its molecular formula.

Enter Chemical Formula

Molecular Formula

Use standard chemical notation (e.g., H2O, NaCl, Ca(OH)2)

Common Compounds

Molar Mass

18.015 g/mol

H2O - 3 atoms total

Element Breakdown

O

Oxygen

15.999 g/mol x 1

15.999 g/mol

88.81%

H

Hydrogen

1.008 g/mol x 2

2.016 g/mol

11.19%

Quick Conversions

1 mole =

18.015 g

1 gram =

0.055509 mol

Molecules/mole

6.022 x 10^23

At STP (gas)

22.4 L/mol