Due date & current week
When are they coming?
Naegele's rule (1812, still surprisingly accurate) plus a real picture of where you are right now — week, trimester, and what's happening next.
Estimated due date
November 9, 2026
189 days to go. Only about 4% of babies actually arrive on this date — most come within a week either side.
Where you are now
WEEK
12+6
TRIMESTER
first
SIZE OF
a lime
Day 0 — last period
32% complete
Day 280 — due
Coming up
Week 6
Heartbeat detectable
Mar 16
Week 13
End of first trimester
May 4
Week 20
Anatomy scan window
Jun 22
Week 24
Viability threshold
Jul 20
Week 28
Third trimester begins
Aug 17
Week 37
Full term
Oct 19
Week 40
Estimated due date
Nov 9
How accurate is this, honestly?about±2 wk
Accuracy±2 wk
Only about 4% of babies are actually born on their predicted due date. About 80% arrive within two weeks of it, which is what "due date" really means — the middle of a window, not a deadline.
We use Naegele's rule (last menstrual period + 280 days), adjusted for cycle length when you tell us yours. First-trimester ultrasound dating is more accurate than LMP, so if you have an ultrasound date, we'll use that instead.
What we don't do: pretend the date is medical advice, factor in twins or IVF without your input, or guess at cycle length. Source: ACOG Committee Opinion on Estimating Due Date.