Science & engineering

Mass & moles calculator

Convert a mass and molar mass into amount of substance, or back.

Mass & moles calculator
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A clear answer. Here’s how.

Moles = mass in grams ÷ molar mass in g/mol. In the other direction, mass = moles × molar mass. You supply the molar mass and purity is assumed to be 100%; chemical composition is not inferred.

See a worked example

Worked example

A fixed demonstration, separate from the values you enter above.

Amount
18
Molar mass (g/mol)
18.01528
Input amount is
Mass in grams

Example result

Amount (mol)
0.999151831112

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