Mass of Atoms Calculator (Atoms, Grams & Moles)

Calculate the mass of atoms from an atom count and element, or how many atoms are in a mass in grams, with moles and molar mass conversions.

Solve for

Number of atoms

Element

Average atomic mass (u)

Filled from the element (standard atomic weight); type your own for an isotope or other substance.

Output unit

Result mass unit

Mass of Atoms Formula

The following formula is used to calculate the mass of atoms.

M(g) = a \times am(amu) \times 1.66053906892 \times 10⁻²⁴ (g) / (amu)

Where M is the mass in grams (g)
a is the total number of atoms
am is the average atomic mass in atomic mass units (u or amu)

To calculate the mass in grams when the atomic mass is in amu, multiply the number of atoms by the atomic mass and then multiply by 1.66053906892×10⁻²⁴ g/amu.

Mass of Atoms Definition

A mass of atoms is defined as the total mass of a group of 1 or more atoms.

Mass of Atoms Example

How to calculate mass of atoms?

First, determine the number of atoms.
This can typically be calculated from the number of moles of a substance.
Next, determine the average atomic mass.
Calculate the average atomic mass using the calculator linked above.
Finally, calculate the mass.
Calculate the mass using the equation above.

FAQ

What is the mass of 1 atom?

It depends on the element and isotope. A good approximation is: mass of one atom ≈ (atomic mass in u/amu) × 1.66054×10^-24 g. The mass is mostly from protons and neutrons, with small contributions from electrons and nuclear binding energy.

mass of atoms formula — This illustration expresses mass in atomic mass units (u). To obtain grams, also multiply by mᵤ ≈ 1.66053906892 × 10⁻²⁴ g/u, as in the formula above.