Pregnancy Due Date Calculator
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Due in October 2027

If your estimated due date falls between October 1, 2027 and October 31, 2027, these are the date ranges your pregnancy shares with everyone due that month. Each range runs from a October 1 due date to a October 31 due date.

MilestoneDue Oct 1Due Oct 31
First day of last periodOr the equivalent date for a cycle other than 28 days.Dec 25, 2026Jan 24, 2027
Estimated conceptionAround 2 weeks 0 days.Jan 8, 2027Feb 7, 2027
Most accurate ultrasound dating ends13 weeks 6 days.Apr 1, 2027May 1, 2027
Second trimester begins14 weeks 0 days.Apr 2, 2027May 2, 2027
Third trimester begins28 weeks 0 days.Jul 9, 2027Aug 8, 2027
Early term begins37 weeks 0 days.Sep 10, 2027Oct 10, 2027
Full term begins39 weeks 0 days.Sep 24, 2027Oct 24, 2027
Late term ends41 weeks 6 days.Oct 14, 2027Nov 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 October due date, from the start to the end of each month.

  1. December 20260 weeks1st trimester
  2. January 20270–5 weeks1st trimester
  3. February 20271–9 weeks1st trimester
  4. March 20275–13 weeks1st trimester
  5. April 20279–18 weeks1st to 2nd trimester
  6. May 202713–22 weeks1st to 2nd trimester
  7. June 202718–26 weeks2nd trimester
  8. July 202722–31 weeks2nd to 3rd trimester
  9. August 202727–35 weeks2nd to 3rd trimester
  10. September 202731–39 weeks3rd trimester
  11. October 202735–41 weeks3rd trimester
  12. November 202740–41 weeks3rd trimester

A October due date is a window, not a deadline

Full term starts at 39 weeks, so for a October 2027 due date it begins as early as September 24, 2027. Late term runs until 41 weeks 6 days, as late as November 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 October baby may well arrive in September or November.

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.