Menstrual cycle meter

A menstrual cycle meter comprising a casing, microprocessor-based electronic circuitry including calendar keeping means and calculating means, a plurality of buttons provided on the casing to enable the microprocessor to receive user-input commands and/or data including the first day of at least the last two menstrual cycles of a user, and a display provided on the casing and under the control of the microprocessor to display indication relating to the calculated fertile and infertile periods of the current menstrual cycle according to the stored input data, said display including visual indicating means for indicating the expected sex of a baby that is likely to be conceived in a particular day during the fertile period wherein the microprocessor is programmed to determine the range of possible ovulation day as from the fourteenth to sixteenth day before the calculated earliest possible first day of the next menstrual cycle to the fourteenth to sixteenth day before the calculated latest possible first day of the next menstrual cycle.