Protein Molarity Calculator

Free online protein molarity calculator – calculate protein molarity enter the concentration and molecular weight of protein then click the calculate button.

Protein molarity:
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Protein Molarity Formula

The formula to calculate protein molarity (PM)

Protein Molarity = (protein concentration) / (protein molecular weight)

Units used in protein molarity calculator


  • M = Molar = moles per liter (mol/L)
  • mM = millimolar = millimoles per liter (mmol/L)
  • um =micormolar = micromoles per liter (umol/L)

Molecular Weight

  • Da = daltons = gram per mole (g/mol)
  • kDa = kilodaltons = 1000 da = 1000 g/mol

Protein Concentration

  • mg/ml = milligrams per milliliter
  • ug/ml = micrograms per milliliter
  • ng/L = nanograms per liter

How to calculate protein molarity

Calculating protein molarity requires two pieces of information

  1. Protein concentration: This is typically given in milligrams per milliliter (mg/mL), micrograms per milliliter (µg/mL), or nanograms per microliter (ng/µL).
  2. Molecular weight of the protein: This is the mass of one molecule of the protein, in Daltons (Da).

Protein concentration divided by molecular weight (da) of protein then you get protein molarity

Solved Example

Example – A solution of bovine serum albumin (BSA) with a concentration of 10 mg/mL. The molecular weight of BSA is 66,430 Da. then calculate the bsa protein molarity

Given values

  • Concentration of BSA = 10 mg/ml
  • The molecular weight of BSA = 66430 Da

Protein molarity = (10mg/ml) / 66430 Da = 0.150534 mM

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BSA Molecular weight Wikipediavisit
From protein concentration to molarityvisit