Abstract: A solid-state electronic wristwatch with a digital display includes additional circuitry to permit utilization of the display and the source of constant frequency signals of the watch to expand its operation to a calorie calculator. The calorie calculator components include a counter circuit for entering a count indicative of caloric intake, circuitry for entering calorie expenditure rate in terms of calories expended per hour, and a main calorie counter into which the calorie input information is entered and from which counts representative of calories consumed are removed at a rate determined by the calorie expenditure rate entered into the system. The watch display may be activated to display the calories being added, the calorie expenditure rate, and the net calories unconsumed on demand by the user. The watch also, if desired, may include a calendar display which also shares the common digital display elements used to display the time and calorie information.