In real-world situations, this turning radius would vary depending on wheel tilt, friction, and many other factors. This formula assumes a perfect theoretical turning scenario. WB is the wheelbase (distance between centers of the front and back wheels).The following formula is used to calculate the turning radius of a car. GVWR (Gross Vehicle Weight Rating) Calculator.Enter the wheelbase length and the turning angle of the front wheels into the calculator to determine the turning radius.