the Expected Date of Delivery The estimated date of delivery, as well asthe expected fetal size at the day of an-tenatal examination, can be obtained byconsulting a pregnancy calculator wheel It consists of two discs sitting on a com-mon axis. The external disc shows 12months and the days of the calendar year.The internal disc shows the postmen-strual gestational period (10 lunarmonths of 28 days or 40 weeks). Theempty segment on the inner disc corre-sponds to the difference between the calen-dar year and the gestational period(minus 3 months plus 7 days, Nagele'srule). The portrayed pregnancy calculatorwheel is set for the first day of the last men-strual period on June 1st. The setting shows the time of ovulation at June 15 andan expected date of delivery on March 5thof the following year. The antenatal exami-nation is on January 5th, the pregnancy isin the 32nd gestational week. 8 weeksbefore the estimated date of delivery.
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