Molecular Weight Calculator

Molecular Weight Calculator is a clean, fast tool that turns any chemical formula into its molar mass (molecular weight) — completely offline. Type a formula and get the answer the moment you finish, complete with a full element-by-element breakdown.

WHAT YOU CAN DO
• Enter a chemical formula and see its molar mass in g/mol instantly
• Read a per-element breakdown: atom count, atomic weight, mass and mass percent
• Handle parentheses and nested groups, e.g. Ca(OH)2 or K4[Fe(CN)6]
• Handle hydrates with a dot, e.g. CuSO4·5H2O or CuSO4.5H2O
• Tap a built-in library of common compounds to load them in one touch
• Copy the result to the clipboard

ACCURATE BY DESIGN
Calculations use the IUPAC conventional standard atomic weights for all 118 elements. Water (H2O) comes out to 18.015 g/mol, glucose (C6H12O6) to 180.156 g/mol, and table salt (NaCl) to 58.44 g/mol — the numbers you expect.

CLEAR, NOT CLEVER
Unknown element symbols, unbalanced brackets and empty input are flagged with a friendly message instead of a wrong answer or a crash.

LEARN AS YOU GO
A built-in Learn tab explains, in plain language, what molar mass is, how it is summed from atomic weights, and how the mole concept connects mass to the number of molecules.

WHO IT'S FOR
Chemistry students, teachers, lab technicians, pharmacists and anyone who needs a quick, reliable molar mass without opening a spreadsheet.

PRIVACY
The app collects no personal data and works fully offline — your formulas never leave your device. Ads are served by Google AdMob, which may use an advertising identifier as described in Google's policies.

EDUCATIONAL ESTIMATE
Results are rounded to typical precision for general and educational use and may differ slightly from authoritative references. Always double-check critical values against an official source.

Light and dark themes, a tiny download, and no clutter. Download Molecular Weight Calculator and compute with confidence.