The wedge can also be called as a turned right triangular prism so that it rests on one of its lateral rectangular faces. Find the volume of the wedge using the volume of a wedge formula mentioned below. To calculate the volume of a rectangular wedge, multiply the base width with height, divide the result by 6. On other end multiply 2 with the base side and add the top side with the obtained value. Multiply this value by the first step value to know the volume.