text: The minimum angle, , which an oblique shock can have is the Mach angle , where  is the initial Mach number before the shock and the greatest angle corresponds to a normal shock. The range of shock angles is therefore . To calculate the pressures for this range of angles, the Rankine–Hugoniot equations are solved for pressure:
  To  calculate the possible flow deflection angles, the relationship between shock angle  and  is used:
  Where  is the ratio of specific heats and  is the flow deflection angle.