Empirical Formula Calculator

Calculate the empirical formula from elemental masses and atomic weights. Free online calculator with step-by-step mole ratios and results.

Calculate empirical formula from elemental masses and atomic weights

Enter up to 4 elements with their masses and atomic masses. Only elements with both mass and atomic mass filled will be used.

Element 1:

Mass (g):

Atomic Mass (g/mol):

Element 2:

Mass (g):

Atomic Mass (g/mol):

Element 3:

Mass (g):

Atomic Mass (g/mol):

Element 4:

Mass (g):

Atomic Mass (g/mol):

About This Calculator

The Empirical Formula Calculator determines the simplest whole-number ratio of elements in a compound from mass and atomic mass inputs.

Convert masses to moles, divide by the smallest mole value, and round to get the empirical formula subscripts. This is fundamental in stoichiometry.

The empirical formula shows the simplest whole-number ratio of atoms of each element in a compound.

Convert element masses to moles (mass/atomic mass). Divide each by the smallest mole value to get ratios.

Empirical is simplest ratio; molecular shows actual atoms.