Unit Conversion

Convert numbers between two units quickly and precisely

Molar Mass Converter

Unit Conversion

Convert molar mass: g/mol, dalton, and kilodalton

Molar mass states the mass of one mole of a substance and is usually given in grams per mole (g/mol). For individual atoms and molecules, dalton (Da) and the unified atomic mass unit (u) are common; for macromolecular systems like proteins, kilodalton (kDa). All combinations of SI prefixes for mass (nano to kilogram) and amount of substance (nano to kilomole) are also available.

Key conversion factors:

  • 1 gram per mole (g/mol) = 1 dalton (Da) = 1 atomic mass unit (u) – numerically identical
  • 1 kilodalton (kDa) = 1,000 dalton – common for protein masses
  • 1 kilogram per mole (kg/mol) = 1,000 grams per mole
  • Water (H₂O): 18.02 g/mol · Sodium chloride (NaCl): 58.44 g/mol

Applications:

  • Stoichiometry: calculating reaction equations and amounts of substance
  • Biochemistry: stating the molar mass of proteins and nucleic acids in kilodalton
  • Analytics: mass spectrometry and molecular weight determination

The molar mass converter supports stoichiometric calculations. To determine molar mass directly from a chemical formula, the molar mass calculator is also available.

Frequently asked questions about converting molar mass

Yes, numerically g/mol, dalton (Da), and the atomic mass unit (u) are identical – 1 g/mol = 1 Da = 1 u. g/mol tends to be used in classical chemistry, while Da and u are more common in biochemistry and physics for individual molecules.

Proteins and other macromolecules often have molar masses ranging from tens of thousands to millions of g/mol. Kilodalton (1 kDa = 1,000 g/mol) keeps such figures more manageable, for example for the size of hemoglobin (about 64.5 kDa).

Not directly with this converter – it only converts between units once you already have the molar mass as a number. To calculate molar mass from a chemical formula, use our molar mass calculator instead, which evaluates the formula automatically.