Prandtl-Glauert rule Calculator

The Prandtl-Glauert rule provides corrections to various aerodynamic parameters, including lift, drag, and pressure coefficients, when the flow speed approaches but remains below the speed of sound (i.e., for subsonic flows). In subsonic conditions, air behaves as an incompressible fluid, but as the flow speed gets closer to the speed of sound (Mach 1), the density and pressure variations become significant, causing deviations from incompressible flow assumptions. 

  • Pressure coefficient (Cp)
  • Incompressible pressure coefficient (Cp,0) 
  • Freestream Mach number (M∞) 

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