Mass from Moles Calculator

About this calculator

The relationship m = n × M ties together a substance's mass (m), the amount in moles (n), and its molar mass (M, in grams per mole) — one of the most-used equations in stoichiometry, since it's the bridge between the counting unit chemists work in (moles, tied to Avogadro's number of particles) and the mass unit a lab balance actually measures. Molar mass itself comes from summing a compound's atomic masses from the periodic table, so a mole of water (18.02 g/mol) weighs far less than a mole of glucose (180.16 g/mol) even though both represent the same 6.022×10²³ particles.

This calculator takes an amount in moles and a molar mass and returns the corresponding mass. Chemistry students working through stoichiometry problem sets, lab technicians preparing a solution to a target molarity, and pharmacists compounding a specific dose use it to convert between the two units without reaching for a calculator and periodic table separately every time a reaction or recipe calls for a mole quantity.