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      COVID-2019 Alert

      The latest information about the 2019 Novel Coronavirus, including vaccine clinics for children ages 6 months and older.

      La información más reciente sobre el nuevo Coronavirus de 2019, incluidas las clínicas de vacunación para niños de 6 meses en adelante.

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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).

      Related Topics

      • Calculating a Due Date
      • First Trimester
      • First Trimester Screening
      • First Trimester Fatigue
      • Common Changes During Pregnancy

      Related Links

      • Johnson Center for Pregnancy and Newborn Services
      • Fetal and Pregnancy Health

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