These calculations are based on one of three formulas for 2 points, 4 points, or 6 points of crush data. Basic Layout. 1. Data Input area - Vehicle Description, Crush measurements (pick radial button to calculate 2, 4, or 6 crush measurements), Coefficient of Stiffness values (A and B), PDOF (Principle Direction of Force), Damage Offset, Field and Crash Length.