Mole Calculator

Calculate moles, mass and particle count from a molar mass using n = m / M.

Calculator

Use n = m / M. Enter a molar mass in g/mol.

Calculate
Amount1 mol
Mass18.015 g
Particles6.0221e+23

Formula and assumptions

n = m / M; particles = n × Nₐ

A mole links an amount of substance to its mass through molar mass. The particle count uses the exact Avogadro constant, 6.02214076 × 10²³ mol⁻¹.

Assumption: The supplied molar mass represents the substance being calculated.

Variables and units

  • n — amount of substance (mol)
  • m — mass (g)
  • M — molar mass (g/mol)

Worked example

For 18.015 g of water with a molar mass of 18.015 g/mol, n = 1.000 mol.

Important limits

The calculator does not identify a compound or validate its formula or molar mass.

Reference and related tools

IUPAC: amount of substance. Return to Chemistry Calculators for the other tools in this group.