Pregnancy
Assumptions explained belowDue date and pregnancy week
Enter the first day of your last period to see an estimate — no sign-up needed.
An estimate, not an exact prediction
Only about 1 in 20 babies is born exactly on the calculated date. Your prenatal care team may adjust this date based on scans.
Calculated with Naegele's rule: first day of your last period + 280 days (40 weeks), assuming an average 28-day cycle. Real pregnancies vary — use this as a starting point for a conversation with your prenatal care team, not as a diagnosis. The result isn't saved anywhere.
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