Convert between mass, moles and number of particles for any substance.
The mole links mass to particle count through Avogadro’s number. Dividing mass by molar mass gives moles, which is the currency of every stoichiometric calculation. Reactions happen in whole-number ratios of particles, not of mass, which is why converting to moles is always the first step.
Moles
n = m ÷ M; particles = n × 6.022 × 10²³
n = m ÷ M; particles = n × 6.022 × 10²³ The mole links mass to particle count through Avogadro’s number. Dividing mass by molar mass gives moles, which is the currency of every stoichiometric calculation.
Reactions happen in whole-number ratios of particles, not of mass, which is why converting to moles is always the first step.
This calculator takes 2 inputs: Mass of substance, Molar mass. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.