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About 80% of childbirths occur between 37 and 41 weeks of gestational age, with a somewhat more narrow span when based on first trimester ultrasound.
Given that these gestation lengths are only estimates of an average, it is helpful to consider gestation time as a range of dates rather than as a single "due date".
The rule estimates the expected date of delivery (EDD) by adding a year, subtracting three months, and adding seven days to the origin of gestational age.
The result is approximately 280 days (40 weeks) from the start of the last menstrual period.
Another method is by adding 9 months and 7 days to the first day of the last menstrual period.
Naegele's rule is named after Franz Karl Naegele (1778–1851), the German obstetrician who devised the rule.
If problems occur you may be advised that delivering your baby earlier is the safest option.