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Molar mass of a chemical formula, with a per-element mass breakdown.
Results update as you type.
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molecular weight calculator is a simple and easy to use calculator that can be used to calculate the molecular weight of a compound. The molecular weight calculator is a simple and easy to use calculator that can be used to calculate the molecular weight of a compound. The molecular weight calculator is a simple and easy to use calculator that can be used to calculate the molecular weight of a compound. The molecular weight calculator is a simple and easy to use calculator that can be used to calculate the molecular weight of a compound. The molecular weight calculator is a simple and easy to use calculator that can be used
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Multiply each element’s atomic weight by how many atoms of it the formula contains, then add them up. Water (H₂O) is 2 × 1.008 + 15.999 = 18.015 g/mol.
What formula syntax is supported?
Element symbols with optional counts, nested parentheses and a leading multiplier for hydrates. Ca(OH)2 is read as one calcium, two oxygen and two hydrogen; CuSO4.5H2O includes five waters.
QFontDatabase
Numerically they are the same value. Molecular weight (or molecular mass) is a relative figure in daltons for one molecule; molar mass is the mass of a mole in grams per mole. Both equal the summed atomic weights.
QSoftKeyManager
Use a dot before the water group: CuSO4.5H2O. The leading 5 multiplies the H2O, adding five waters of crystallisation, and the calculator returns 249.68 g/mol for that hydrate.
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For each element it gives that element’s share of the total mass. In water, oxygen is about 88.8% and hydrogen 11.2%; in glucose, carbon is 40.0%, hydrogen 6.7% and oxygen 53.3% — useful for empirical-formula and purity work.
QSoftKeyManager
Every element symbol must be capitalised correctly (Co is cobalt, but CO is carbon plus oxygen), and only real elements are accepted. Check for lowercase symbols, unmatched parentheses or typos if you see a parse error.
QPrintPreviewDialog
Yes — wrap the group in parentheses with its multiplier, like Ca(OH)2 or (NH4)3PO4. The parser expands the parentheses and multiplies the enclosed atoms, so ammonium phosphate sums correctly across all three ammonium groups.
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[Translation temporarily unavailable. Please try again.] Anything you omit uses the same default this page is pre-filled with; an unknown parameter is a 400, never a silent zero. [Translation temporarily unavailable. Please try again.] →
Endpoint
GET https://calculator.free/api/v1/molecular-weight/curl
curl "https://calculator.free/api/v1/molecular-weight/?formula=H2O"JavaScript fetch()
const r = await fetch(
"https://calculator.free/api/v1/molecular-weight/?" + new URLSearchParams({
"formula": "H2O"
}));
const data = await r.json();
console.log(data.results);Results are estimates for general guidance only, not financial, medical or tax advice.