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Calculating a Due Date

A typical pregnancy lasts, on average, 280 days, or 40 weeks — starting with the first day of the last normal menstrual period as day 1. An estimated due date can be calculated by following steps 1 through 3:

  1. First, determine the first day of your last menstrual period.

  2. Next, count back 3 calendar months from that date.

  3. Lastly, add 1 year and 7 days to that date.

Due Date Calendar
Click Image to Enlarge

For example: Your last menstrual period began on September 9, 2010. Counting back 3 calendar months would be June 9, 2010. Adding 1 year and 7 days would bring you to June 16, 2011, as your estimated due date.

This 3-step method is referred to as Naegele's Rule and is based on a normal 28-day menstrual cycle. Therefore, dates may have to be adjusted for longer or shorter menstrual cycles. 

You may also estimate your delivery date by using the steps 1 and 2 and the chart:

  1. First, locate the first day of your last menstrual period (in black text).

  2. Next, note the date directly below. This is your estimated date of delivery (in blue text).

Online Medical Reviewer: Finke, Amy, RN, BSN
Online Medical Reviewer: Sacks, Daniel, MD, FACOG
Date Last Reviewed: 8/10/2015
© 2000-2015 The StayWell Company, LLC. 780 Township Line Road, Yardley, PA 19067. All rights reserved. This information is not intended as a substitute for professional medical care. Always follow your healthcare professional's instructions.
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