Abstract: Utility usage monitoring systems for monitoring the consumption or use of a particular utility and displaying the accumulated use in terms of its cost. The rate of usage of the utility is converted to a pulse train with a repetition rate dependent upon the usage. In one embodiment, a calculator chip having an automatic constant capability and coupled to an electronic display is caused to successively execute a summing operation dependent upon the pulse train repetition rate and to provide a cumulative total for display. A keyboard is provided to enter the automatic constant, and to allow the change thereof to provide the proper utility cost or charge. Another embodiment utilizes a microprocessor coupled to a display for displaying the accumulated utility usage, with the microprocessor being programmed to repetitively update the display.