Advanced Atom Calculator

Powerful interactive tool for chemistry classes and labs that converts mass and moles to total atoms parses complex formulas breaks down elements visualizes composition and exports results to CSV and PDF while keeping an auditable history of calculations for reports assignments and quality control workflows. Suitable for students teachers technicians researchers and hobbyists alike

Inputs

Chemical formula (e.g., H2O, C6H12O6, CuSO4·5H2O) Use element symbols with capitalization. Parentheses and dot hydrates supported.

Sample mass (g)

Moles (optional) If provided, calculations use moles directly.

Avogadro's number (1/mol) SI exact value.

Molar mass (g/mol) Auto from formula.

Derived values

Atoms per molecule -
Molecules in sample -
Total atoms in sample -

Composition

Elemental breakdown graph

Bars display atom counts per molecule for the given formula.

Actions

Exports include all rows in the results table below.

Help

• Use a dot or middle dot for hydrates: CuSO4·5H2O

• Parentheses are supported: Ca3(PO4)2

• To use moles directly, fill the moles field; mass is then ignored.

Example data & your saved runs

#	Timestamp	Formula	Molar mass (g/mol)	Sample mass (g)	Moles	Molecules	Atoms per molecule	Total atoms