A system determines the revolutions of an object using multiple accelerometers. A difference vector between at least 2 multi-axis accelerometers spaced some distance apart is used to calculate the two-dimensional or three-dimensional centripetal acceleration vector. The centripetal acceleration vector is then used as a rough estimate for the sampling rate for a digital tracking bandpass filter. This bandpass filter extracts angular orientation data leading to a sampling rate and to a revolution totalizer. The number of revolutions of the object, along with a known diameter of an attached object, such as a vehicle wheel, may be used to calculate distance traveled by the object.