Abstract: A flow rate measuring system for conveyed material includes a conveyor including a frame and a material supporting surface moveably supported by the frame. The flow rate measuring system utilizes height measurement devices which are responsive to the height of the material supported on the material supporting surface of the conveyor for taking material height measurements. A signal generating device provides an output signal in response to the height measurement device. The height of the material on a conveyor of known width and known speed allows the calculation of volume or mass flow rates. The height measurement device typically comprises a deflection impact surface which is a finger or paddle assembly. The flow rate measuring system for conveyed material additionally may include a signal processing device such as computer for taking and recording height measurements as specific intervals.