Relative atomic mass calculator online

Online calculator which helps you calculate the relative atomic mass.
Relative atomic mass is the value of the mass of an atom expressed in atomic mass units and is defined as the ratio of the mass of an atom of this element to 1/12 of the mass of a neutral atom of the isotope carbon 12C.
From this definition it follows that the relative atomic mass is a dimensionless quantity.

Indicate the number of protons:

Indicate the number of neutrons:

Atomic mass of an element: