Molar Mass Calculator
Compute molar mass from a chemical formula. Supports common elements; multi-character symbols and subscripts.
Result
General calculation reads
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How to use this calculator
- Type the formula (case-sensitive: O ≠ o).
- Read molar mass.
About this calculator
Molar mass is the mass of one mole of a substance, in g/mol. For a molecule, sum the atomic masses of all atoms. H2O = 2 × 1.008 + 15.999 = 18.015. The calculator handles common formulas with single-letter and two-letter element symbols and integer subscripts. Parentheses and water-of-hydration aren't parsed; expand them yourself if needed.
Frequently asked
Why case-sensitive?+
Does this handle parentheses like Ca(OH)₂?+
Why are atomic masses not whole numbers?+
Where do these atomic masses come from?+
Most common formulas to check?+
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