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Calculation of delivery date


Calculated from the first day of the last menstruation, human pregnancy lasts 40 weeks (280 days). Since mother nature does not behave like a quartz watch, only 3% of children are really born on the day of the due date. 95% of children are born between 38 and 42 completed weeks (i.e. date of birth plus or minus two weeks).


If your cycle is longer or shorter than 28 days, your baby will be born later or sooner accordingly (seven days later in a cycle of 35 days). If you happen to know the date of conception, count back 14 days and take this date as the date of the last menstruation. In any case, we will verify the due date of birth between 8 and 12 weeks by ultrasound.


Please key in the first day of your last menstrual period in the format Day (dot) Month (dot) Year (Examples: 5.1.08, 05.01.2008).


Last period (D.M.Y)

How far am I today?

Due date



We wish you all the best for your pregnancy and childbirth!