Grams to Moles Calculator

Your details

Choose which quantity to solve for. The other two fields become your inputs.
Selecting a substance auto-fills its molar mass. Choose "Custom" to enter any value.
The mass you weighed out. Switch units between grams, milligrams and kilograms.
Choose the mole unit for the result. Useful for small biochemistry or pharmacology quantities.
Amount of substance
1.000278mol
Amount (selected unit)1.0003
Mass of sample18.02g
Molar mass18.015g/mol
Number of particles602,381,218,402,442,300,000,000particles
Millimoles1,000.278mmol
Micromoles1,000,277.546umol
Millimoles (mmol)1,000.278
Micromoles (umol)1,000,277.546

18.02 g corresponds to 1.0003 mol of substance.

  • That is 1,000.2775 mmol, 1,000,277.5465 umol, or about 6.024e+23 individual particles.
  • Moles = mass / molar mass, so the answer is only as accurate as the molar mass you enter.
  • Molar mass is the sum of the standard atomic weights of all atoms in the molecular formula.
  • This is a typical bench-chemistry quantity.

Next stepNeed to go the other way? Switch the mode above to "Mass from moles" to convert an amount back into grams.

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