Atomic mass/molecular weight online calculator

App description

Atomic mass is divided into absolute atomic mass and relative atomic mass.
Absolute mass refers to the actual mass of an atom, which can also be
called the absolute mass of an atom. The relative atomic mass is the
relative mass of an atom, that is, one twelfth of the mass of a carbon
atom (a carbon atom with six protons and six neutrons in the nucleus,
which can be simply expressed as 12C) as the standard, and the actual
mass of other atoms is compared with it, and the value obtained is the
relative atomic mass of that kind of atom.

The relative molecular mass is the sum of the relative atomic mass (AR)
of each atom in the chemical formula, expressed by the symbol Mr,
and the unit is 1.

Usage example

Input chemical formula: C2H5OH

Click "Calculate" to output the result.

Atom Number of atoms Atomic mass Weight%

H, 6, 1.008, 13.128%

O, 1, 15.999, 34.728%

C, 2, 12.011, 52.144%

Molecular weight： 46.069

Note

This calculator can only calculate the molecular formula, not
the result of structural formula.

Chemical formula input is case sensitive.