ONE FORMULA, ONE ANSWER
Prandtl Number Calculator
Calculate the ratio of momentum diffusivity to thermal diffusivity. Choose input units and calculate one value within the stated conditions.
Inputs
Calculations run in this browser. Scientific notation such as 1.2e-3 is supported. Do not group thousands.
Result
Prandtl number Pr
Enter values and select Calculate.
Pr = μc_p/k
Assumptions
Required: μ,c_p,k>0 for the same fluid state. μ is dynamic viscosity, not kinematic viscosity. Effective non-Newtonian properties are not estimated.
Displayed values are floating-point approximations. Design safety factors and unprovided error contributions are not calculated.
Formula references and credits
NaNa Lab created the code, descriptions, icons and preview images. Text, figures and code from the linked references have not been reproduced.
Physical constants: NIST / CODATA 2022. The values of μ₀ and ε₀ are measured recommendations, not exact defining constants. Values and precision notes are in the source record.
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