Osmotic Pressure Calculator

Enter all the known values. Select the proper units for your inputs and the units you want to get the calculated unknowns in and press Solve.

π
The osmotic pressure in units of pressure - usually Pascals or bars.
n
The number of ions produced when the solute undergoes dissociation. It is also called the dissociation factor or the van't Hoff factor. It usually ranges from 1 (for substances that cannot be dissociated) to 3.
Φ
The osmotic coefficient of the solute. It is a unitless factor dependent on the type of substance. Its value is most often close to 1.
c
The molar concentration of the solution in mol/liter.
R
The universal gas constant equal to 8.314 J/(K*mol).
T
The temperature measured in Kelvins.
  • π = n * Φ * c * R * T
mol/L
L bar K−1 mol−1
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