Osmotic Pressure Calculator

Osmotic Pressure Calculator

Osmotic Pressure: -- atm

How to Use This Calculator

Enter the molarity of the solution, temperature in Celsius, and optionally adjust the gas constant. The osmotic pressure will be calculated automatically.

What is Osmotic Pressure?

Osmotic pressure is the pressure required to stop the flow of solvent into a solution through a semipermeable membrane. It’s a key concept in chemistry and biology for understanding solution behaviors.

Formula

Osmotic Pressure (π) = M × R × T

  • M = Molarity (mol/L)
  • R = Gas Constant (0.0821 L·atm/mol·K)
  • T = Temperature in Kelvin (K = °C + 273.15)

Example

For a 0.5 mol/L solution at 25°C, the osmotic pressure is:

π = 0.5 × 0.0821 × (25 + 273.15) = 12.29 atm

Links

Detention Time Calculator.