Pregnancy tool

Baby Due Date Countdown

Enter your due date and watch the countdown — weeks and days remaining, how far along you are, percentage complete, and every milestone between now and birth.

Last reviewed 20 May 2026

Don't know it yet? Use the Due Date Calculator first.

How to use this countdown

  1. Enter your estimated due date. If you don't know it, run the Due Date Calculator first.
  2. The hero shows weeks + days remaining (or days past due).
  3. The progress bar shows the percentage of a 280-day pregnancy completed and your current week + trimester.
  4. The milestone list checks off points you've passed and dates the ones still ahead.
  5. The URL updates with your due date — copy it to share your countdown.

Background: what the countdown represents

A full-term pregnancy is counted as 280 days (40 weeks) from the first day of the last menstrual period. The estimated due date marks the 40-week point. This countdown works the timeline in both directions: forward from the implied last-period date to tell you how far along you are, and toward the due date to tell you how much time is left.

Pregnancy is conventionally divided into three trimesters: weeks 1–13, weeks 14–27, and weeks 28–40. The progress bar and the "trimester" readout reflect that split.

How to interpret your countdown

The single most important thing to remember: the due date is an estimate, not an appointment. Only around 5% of babies are born on their estimated due date. A birth anywhere in the 37-to-42-week window is considered normal-term. So:

  • A countdown reaching zero doesn't mean anything is "late".
  • Days-past-due is normal up to a point — providers monitor more closely from 41 weeks.
  • The milestone markers are the more useful signal — they tell you what stage you're actually in.

What this tool does NOT do

  • It does not predict your actual labor date.
  • It does not assess the health of your pregnancy.
  • It does not replace prenatal care or your provider's dating.

Sources

  • American College of Obstetricians and Gynecologists. Committee Opinion No. 700: Methods for Estimating the Due Date.
  • ACOG. Definition of Term Pregnancy (Committee Opinion No. 579) — early/full/late/post-term windows.
  • Jukic AM, et al. Length of human pregnancy and contributors to its natural variation. Human Reproduction. 2013.

See our methodology. Not a substitute for medical advice — read the medical disclaimer.

Frequently asked questions

How is the countdown calculated?
From your estimated due date (EDD), we count the days remaining to today and express them as weeks + days. We also derive how far along you are by counting forward from the implied last-period date (EDD minus 280 days), then show the percentage of a 280-day pregnancy completed.
Will my baby arrive exactly on the due date?
Almost certainly not on the exact day — only about 5% of babies do. The EDD is a single best estimate. A normal, full-term birth happens anywhere between 37 and 42 weeks. Treat the countdown as a guide, not a deadline.
What do the milestone markers mean?
They flag well-known points in pregnancy — end of the first trimester (week 12), the halfway anatomy scan (week 20), the viability milestone (week 24), the start of the third trimester (week 28), early term (week 37), full term (week 39), and the due date (week 40). Passed milestones are checked off; upcoming ones show their expected date.
Can I share my countdown?
Yes. As you set your due date, the page URL updates with a ?due= parameter. Copy the URL from your address bar and the recipient sees the same countdown.
My due date changed after an ultrasound — which should I use?
Use the most recent EDD your provider gave you. A first-trimester dating ultrasound is the most accurate, and providers update the EDD when scan dating differs meaningfully from last-period dating. Enter that revised date here.
What happens if I go past my due date?
The countdown will show days past due. Going a little past the EDD is common and usually not a concern on its own. Most providers monitor more closely from 41 weeks and discuss options around 41–42 weeks. Follow your care team's guidance.

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