Note: this form uses JavaScript to compute properties related to the 1976 standard atmosphere up to 230,000 ft. The computations require Netscape 2.0 or later. Adapted by Andrew McGrath from calculator by Ilam Kroo, Stanford University. Select unit system: Metric Imperial Inputs Altitude Speed Reference Length Results Temperature Density Pressure Speed of Sound Viscosity Mach Number Dynamic Pressure Critical Cp Vacuum Cp Reynolds Number Laminar Cf Turbulent Cf