Pregnancy Due Date Calculator
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Due in September 2027

If your estimated due date falls between September 1, 2027 and September 30, 2027, these are the date ranges your pregnancy shares with everyone due that month. Each range runs from a September 1 due date to a September 30 due date.

MilestoneDue Sep 1Due Sep 30
First day of last periodOr the equivalent date for a cycle other than 28 days.Nov 25, 2026Dec 24, 2026
Estimated conceptionAround 2 weeks 0 days.Dec 9, 2026Jan 7, 2027
Most accurate ultrasound dating ends13 weeks 6 days.Mar 2, 2027Mar 31, 2027
Second trimester begins14 weeks 0 days.Mar 3, 2027Apr 1, 2027
Third trimester begins28 weeks 0 days.Jun 9, 2027Jul 8, 2027
Early term begins37 weeks 0 days.Aug 11, 2027Sep 9, 2027
Full term begins39 weeks 0 days.Aug 25, 2027Sep 23, 2027
Late term ends41 weeks 6 days.Sep 14, 2027Oct 13, 2027

Dates follow ACOG’s trimester and term definitions.1,2 For your exact dates, use the calculator below.

How far along you’ll be, month by month

The range covers every September due date, from the start to the end of each month.

  1. November 20260 weeks1st trimester
  2. December 20260–5 weeks1st trimester
  3. January 20271–9 weeks1st trimester
  4. February 20275–13 weeks1st trimester
  5. March 20279–18 weeks1st to 2nd trimester
  6. April 202714–22 weeks2nd trimester
  7. May 202718–26 weeks2nd trimester
  8. June 202722–31 weeks2nd to 3rd trimester
  9. July 202727–35 weeks2nd to 3rd trimester
  10. August 202731–39 weeks3rd trimester
  11. September 202735–41 weeks3rd trimester
  12. October 202740–41 weeks3rd trimester

A September due date is a window, not a deadline

Full term starts at 39 weeks, so for a September 2027 due date it begins as early as August 25, 2027. Late term runs until 41 weeks 6 days, as late as October 13, 2027.2 In an Australian study of births after spontaneous labor, only about 5% arrived on the estimated due date, and about two-thirds within a week of it.3 So a September baby may well arrive in August or October.

Your due date may also move once, after an early ultrasound.4 Read how accurate due dates are.

Find your exact dates

Enter the due date your care team gave you, or choose another method.

What do you know?

The day bleeding started, not the day it ended.

From the first day of one period to the first day of the next.

Calculated on your device. Your dates are never sent to us. Privacy

Sources

  1. How Your Fetus Grows During PregnancyAmerican College of Obstetricians and Gynecologists
  2. Committee Opinion No. 579: Definition of Term PregnancyAmerican College of Obstetricians and Gynecologists, 2013
  3. Predicting date of birth and examining the best time to date a pregnancyInternational Journal of Gynecology & Obstetrics 123(2):105–109, 2013
  4. Committee Opinion No. 700: Methods for Estimating the Due DateAmerican College of Obstetricians and Gynecologists, with AIUM and SMFM, 2017

Links checked November 12, 2026. Citing a source does not mean it endorses this site.