Naegele’s Rule is coined after the German obstetrician, Franz Karl Naegele who developed the rule. Many obstetricians are utilizing this type of pregnancy calculator to verify the estimated due date.
This rule serves as a pregnancy calculator as it approximately calculates the EDD or expected date of delivery. It is done by getting the first day of the woman’s Last Menstrual Period (LMP) and adding up 12 months to it, then subtracting three months and adding seven days to that time. The outcome will be more or less 280 days or 40 weeks from the LMP.
However, this pregnancy calculator does not always happen in 280 days due to the differences of days in months.
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