The Naegele's formula is simple arithmetic method for calculating the EDD (estimated date of delivery) based on the LMP (last menstrual period).
To the date of the first day of the LMP (e.g. 22nd June 2008):
- add seven days (i.e 29th)
- subtract 3 months (i.e March)
- add one year (i.e 2009)
- 1. Chudleigh, T. and Thilaganathan, B. "Obstetric ultrasound; how, why and when" Elisvier 2004