Moles calculator
Fill in what you know and leave the unknown box empty — it works out whichever one is missing. Nothing is uploaded; the arithmetic happens in your browser.
The formula
n = m ÷ M
Where this usually goes wrong
M is the molar mass from the periodic table, in g/mol. This is the conversion every other chemistry question is built on.
Worked example
18 g of water is almost exactly 1 mol.
Those numbers are already in the boxes above — press Work it out to see it, then change them for your own.
Related chemistry calculators
- Molarity calculator
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