Molar Mass Converter — g/mol & kg/mol

Convert between grams per mole, kilograms per mole, daltons, and pound-mass per pound-mole.

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How this conversion works. Molar masses are converted through g/mol; equal-ratio units (kg/kmol, lb/lb-mol, Da) are exact identities per the BIPM SI Brochure.

How to use

  1. Pick the unit you are converting from, such as Kilogram per mole (kg/mol) or Gram per mole (g/mol).
  2. Type the value and every other unit updates as you type.
  3. Copy the figure you need, or use the swap button to reverse the direction, Dalton (Da) included.

Frequently asked questions

How do I convert gram per mole to kilogram per mole?

1 gram per mole = 0.001 kilogram per mole. Choose "Gram per mole (g/mol)" as From and "Kilogram per mole (kg/mol)" as To, type a value, and the result updates instantly.

Why do g/mol, kg/kmol, and lb/lb-mol have the same value?

Scaling both the mass and the amount unit by the same factor cancels out — water is 18.015 g/mol, 18.015 kg/kmol, and 18.015 lb/lb-mol. Only kg/mol shifts the decimal.

Is a dalton the same as g/mol?

Numerically yes: a molecule of mass 500 Da has a molar mass of 500 g/mol. The dalton describes one molecule; g/mol describes a mole of them.

Is my data sent to a server?

No. Conversions run entirely in your browser using fixed factors — nothing is uploaded or logged.

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