This paper reviews the more widely used bed-load surrogate acoustic measuring techniques that were tested both in flume experiments and field settings. A fair number of these measuring techniques have been successfully calibrated for total bed-load flux, which generally requires contemporary direct bed-load transport measurements in the field. Essentially, linear or power-law relations were established between a simple metric characterizing the acoustic signal and bed-load mass. In some studies, further calibration relations were established to identify particle size, either based on signal amplitude and/or on characteristic frequency of that part of the signal associated with a single impact of a particle (e.g., for impact plate systems), or by determining a characteristic frequency for an entire grain-size mixture (for the hydrophone system). A few of the acoustic measuring techniques were used to determine bed-load transport by grain-size classes. Some studies examined how far findings from flume experiments can be quantitatively transferred and applied to field sites for which independent, direct calibration measurements exist.