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Prandtl Number Calculator — Viscosity, Heat Capacity & Thermal Conductivity
Calculate Prandtl number from dynamic viscosity, specific heat and thermal conductivity.
Last updated: September 17, 2026
Results
Enter positive μ, cp and thermal conductivity
Formula, example and assumptions
Pr=μcp/k=ν/α.
For air near room conditions Pr is roughly 0.7, while many liquids have larger values.
- Fluid properties should be evaluated at an appropriate representative temperature.
- Use mutually consistent SI units for μ, cp and k.
FAQs
What does Prandtl number compare?
It compares momentum diffusivity with thermal diffusivity.
Is Prandtl number dimensionless?
Yes. With consistent units the dimensions cancel.