A feto-maternal calendar calculator (10) provides for calculating the gestational age of a fetus from the calendar date of the mother's last menstrual cycle. Using the calculated gestational age, the user of the calendar calcalator may determine appropriate growth of fetal organs, determine the earliest time for detection of fetal anomalies, establish periods of risk to the fetus from drugs used by the mother, determine the appropriate times for testing for fetal anomalies, genetic abnormalities, or other fetal biochemical milestones. The calendar calculator of the present invention is designed for ease of use and for providing information previously unavailable to obstetricians and diagnostic technicians.
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