How many apples make an orange? Yards are measured in a straight line. Cubic feet are measure "by the box" so to speak. IF you mean "cubic yards", that is, boxes one yard high by one yard wide by one yard deep, then because there are 27 cubic feet in a cubic yard, 3 x 3 x 3, 150 cubic yards equals 150 x 27, or 4050 cubic feet.