Please note that we are seeing high patient volumes in the emergency department. Learn more >>.

Know before you go to the ER
Select the search type
  • Site
  • Web
Go

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.

For example: Your last menstrual period began on September 9, 2023. Counting back 3 calendar months would be June 9, 2023. Adding 1 year and 7 days would bring you to June 16, 2024, 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 steps 1 and 2 below 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).

    Due Date Calendar

Find a doctor or make an appointment: 866.867.3627
General Information: 314.747.3000
One Barnes-Jewish Plaza
St. Louis, MO 63110
© Copyright 1997-2024, Barnes-Jewish Hospital. All Rights Reserved.