Enter a Molecular Formula (like C₆H₁₂O₆) or pick from the Select Common Compound dropdown, and this Molecular Weight Calculator gives you the Molecular Weight alongside a breakdown of the Formula, Number of Elements, and Total Atoms.
Molecular Weight
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Formula
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Number of Elements
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Total Atoms
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Molecular weight is the mass of one molecule expressed in atomic mass units (u), while molar mass is the mass of one mole of a substance expressed in grams per mole (g/mol). Numerically, they are the same, but the units differ.
Chemical formulas are case-sensitive. Use capital letters for the first letter of each element symbol (H, C, N, O) and lowercase for the second letter if present (Cl, Br, Ca). Numbers should follow the element they refer to (H2O, not H20).
Yes, the calculator can handle formulas with parentheses and brackets, such as Ca(OH)2 or [Cu(NH3)4]SO4. Make sure to include all brackets and multipliers correctly.
This calculator uses the standard atomic weights published by IUPAC (International Union of Pure and Applied Chemistry), which are the most widely accepted values in chemistry.
Molecular weight is essential for stoichiometric calculations, determining reaction quantities, calculating concentrations, and converting between moles and grams in chemical equations.
Yes, you can include water of crystallization in your formula. For example, enter CuSO4·5H2O or CuSO4.5H2O for copper sulfate pentahydrate.
Check that your formula is spelled correctly, uses proper capitalization, and includes valid chemical symbols. Make sure all brackets are properly closed and multipliers are placed correctly.