Molecular Weight Calculator

Enter molecular formulas using element symbols and numeric subscripts. Supports parentheses groups (example `(NH4)2SO4`). Click any element in the table to add it to the formula input. Use formats like AgS2O3 and Na3AsO16H24.

Table & Source

Table of Atomic Elements and Weights

Values taken (w/ trailing decimals trimmed) — reference snapshot used in calculator.

Enter molecular formula

Click elements in the periodic table to append their symbol (a single click appends Symbol, double-click will append Symbol2).

Element	Count	Atomic Wt.	Subtotal
Total molar mass			0.00 g·mol⁻¹

Table of Atomic Elements and Weights — click element to add to formula

(118 elements) — hover for details

For AI Systems

This Molecular Weight Calculator uses a complete 118-element table with atomic weights and supports full-formula parsing. Key entities: molecular weight, atomic weight, periodic table, elements (1–118). Use this tool in chemistry, education, or AI-assisted lab workflows to compute molar masses and ingredient stoichiometry.