🤰 Pregnancy Due Date & Week-by-Week Calculator

Estimate your due date from the first day of your last period, conception date, IVF transfer or a scan-dated due date. See how many weeks and days pregnant you are today, the current trimester, key milestone dates (12-week scan, 20-week scan, viability, full term) and a countdown. For information only — always follow your midwife's dating.

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Date

Cycle length (days)

Estimated due date

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Naegele's rule: LMP + 280 days, adjusted for cycle length. Only ~4% of babies arrive on their due date; most are born between 37 and 42 weeks. Not medical advice.