Osmotic Pressure Calculator
Calculate osmotic pressure using the van't Hoff equation (π = iMRT). Convert between atm, kPa, mmHg, and psi.
Inputs
Results
Osmotic Pressure
2.4466 atm
How to Use This Calculator
- Enter solution molarity and temperature in Kelvin.
- Set van't Hoff factor (i) — 1 for non-electrolytes, 2 for NaCl, etc.
- Review Osmotic Pressure in atm, kPa, mmHg, and psi, plus Osmolarity (Osm/L).
How the result changes with Molarity
| Molarity | Osmotic Pressure |
|---|---|
| 10 | 244.6619 atm |
| 35 | 856.3166 atm |
| 65 | 1,590.3023 atm |
| 90 | 2,201.957 atm |
What each input means
- Molarity
- Molar concentration of solute in the solution
- Temperature
- Absolute temperature in Kelvin (25°C = 298.15 K)
- van't Hoff Factor (i)
- Number of particles per formula unit in solution (NaCl = 2, glucose = 1)
How this is calculated
Formula
π = iMRTWorked example, using the default values
- Identify Input ParametersMolarity = 0.1, Temperature = 298.15, van't Hoff Factor (i) = 1 = 3 input(s) provided
- Calculate Osmotic PressureOsmotic Pressure2.4466 = 2.4466
- Calculate Osmotic PressureOsmotic Pressure247.9 = 247.9
- Calculate Osmotic PressureOsmotic Pressure1859.43 = 1859.43
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