How to Estimate the Estimated Date of Birth

For expecting mothers, it is often difficult to wait for your first obstetrician's appointment to find out your estimated due date (EDD). Unfortunately, it is not always possible to determine the exact date of the conception of your baby, so most due date estimations are projected based on a 40-week gestational period. This projection is based on the first day of a woman's menstrual cycle. Calculating your estimated due date can be done by simply calculating forward.

Things You'll Need

• Calendar

Show More

Instructions

• 1

  To calculate forward for your estimated due date, determine the first day of your last menstrual cycle.

• 2

  Count forward by 40 weeks.

• 3

  Circle the date, which is the estimated due date for your baby.