Molar Mass Calculator for Chemists

Enter any chemical formula optionally with parenthesis and crystal water as in this example:

La2(CO3)3*8H2O

Please use proper capitalization! NO (nitrogenmonoxide) and No (nobelium) are not the same. Chemical formulas with many levels of parenthesis are accepted.

On recommendation by The International Union of Pure and Applied Chemistry, IUPAC, atomic weights of the elements are taken from Atomic weights of the elements 2007, published in Pure Appl. Chem., Vol. 81, No. 11, pp. 2131-2156, 2009.

The Relative Molar Mass Calculator on this site is based on atomic weights from a later publication.

If you like this site you may also like other publications by the same author at Chemistry for Free.