Molar Mass to Moles Calculator
Enter a substance's mass and molar mass to calculate how many moles of that substance you have.
Molar Mass to Moles Calculator
Calculates the number of moles of a substance from its mass and molar mass.
This calculator divides a given mass by a substance's molar mass to find the amount of substance in moles, using the core chemistry relationship n = m/M. It's a calculation used constantly in stoichiometry, solution preparation, and general chemistry coursework — the default values correspond to converting a 36-gram sample of water into moles, but you can substitute any substance's molar mass for the calculation you need.
Example
- With the default values shown above, this calculator returns: Moles ≈ 1.9978 mol.
Frequently Asked Questions
What is the moles formula?
Moles equals mass divided by molar mass (n = m/M) — this is one of the most fundamental conversions in chemistry, linking a measurable mass to the number of particles (atoms or molecules) it represents.
Where do I find a substance's molar mass?
Molar mass is calculated by summing the atomic masses of all atoms in a molecule's chemical formula, using values from the periodic table — many reference tables also list common compounds' molar masses directly.
Sources
- Standard formula, publicly documented method