What formula formats are supported?

Standard chemical formulas with element symbols, numeric subscripts, and parentheses are supported — e.g., H2O, NaCl, Ca(OH)2, Al2(SO4)3, C6H12O6.

How is molar mass calculated?

Each element's atomic mass (from the IUPAC standard atomic weights) is multiplied by its count in the formula and summed to give the total molar mass in g/mol.

What is percent composition?

Percent composition shows what fraction of the total molar mass each element contributes, expressed as a percentage. It is useful for stoichiometry and identifying empirical formulas.

Can I look up individual elements?

Yes — click any element row in the result table to expand its periodic table data including atomic number, symbol, group, period, and standard atomic weight.

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Chemical Formula Calculator

Parse chemical formulas and calculate molar mass and percent composition.

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关于此工具

Enter any chemical formula — such as H2O, C6H12O6, Ca(OH)2, or NaHCO3 — and instantly get a full element breakdown, the molar mass in g/mol, and the percent composition by mass for each element. Handles nested parentheses, subscripts, and multi-letter element symbols. Click any element in the result table to view its periodic table data.

使用方法

1 Type a chemical formula in the input field (e.g., Ca(OH)2).
2 Click 'Calculate' or press Enter to parse the formula.
3 View the element breakdown table showing each element, count, atomic mass, and mass contribution.
4 Read the total molar mass and percent composition by mass for each element.
5 Click any element row to see its full periodic table entry.

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