Abstract: This study presents a real-time microcomputer-based logger for measuring Basal Body Temperature (BBT). BBT is the normal resting body temperature of a healthy person immediately upon waking in the morning. The temperature for women normally rises after ovulation due to hormonal changes. The temperature is logged real-time into the computer over a period and the BBT chart produced is used to predict ovulation. There is high correlation between the approach developed by this study and other standard measuring equipments-correlation of 0.9945 with standard thermistor and correlation of 0.9977 with standard thermocouple. This development enables privacy of use allowing women to predict their ovulation status at a personal level.