Molar Mass & Composition

Input a chemical formula to instantly calculate its molecular weight and see the percentage by mass of each constituent element.

Enter Molecular Formula

Formula Conventions

Input formulas using standard IUPAC symbols. Support for parentheses is included (e.g., **(NH4)2SO4**). Ensure element symbols use correct case: **Ca** for Calcium, not **ca**.

Scientific Accuracy

Molar masses are derived from standardized IUPAC atomic weights. Percentages are calculated as (Total Atomic Mass of Element / Molecular Mass) × 100.