Prandtl Number Calculator

To use Prandtl number calculator, select the unknown value, enter the known values, and click calculate button.


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Prandtl Number Calculator

Prandtl number calculator is used to find the Prandtl number (dimensionless number) of a fluid.

What is Prandtl Number?

Prandtl number (Pr) is a dimensionless number. It is the ratio of the kinematic viscosity (ν) of a fluid to its thermal diffusivity (α).


Pr = ν/α


  • ν is the kinematic viscosity of the fluid 
  • α is the thermal diffusivity of the fluid.

Using the Prandtl number you can determine the behavior of fluids under different temperatures, gradients, and flow conditions.


Calculate the Prandtl number if the Kinematic Viscosity is 10 and Thermal Diffusivity is 16.


Step 1: Take the given values.

Kinematic Viscosity =10

Thermal Diffusivity = 16

Step 2: Take the formula of the Prandtl number and substitute the values of kinematic viscosity and thermal diffusivity in it.

Pr = ν/α

Pr = 10/16

Pr = 5/8

Pr = 0.625

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