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Calculating a Due Date

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).

Reviewed Date: 08-10-2015

Cálculo de la Fecha de Parto

This content was reviewed by Mid-Atlantic Womens Care, PLC. Please visit their site to find an Mid-Atlantic Womens Care obstetrician.

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Disclaimer: This information is not intended to substitute or replace the professional medical advice you receive from your child's physician. The content provided on this page is for informational purposes only, and was not designed to diagnose or treat a health problem or disease. Please consult your child's physician with any questions or concerns you may have regarding a medical condition.