Health Calculator

Pregnancy Calculator

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Estimate your expected delivery date and pregnancy week using your last menstrual period and average cycle length. The calculation assumes Naegele's rule (LMP + 280 days), adjusted for cycle length.

Trimesters

  • First trimester — weeks 1–12: foundational organ development.
  • Second trimester — weeks 13–26: rapid foetal growth.
  • Third trimester — weeks 27–40: final maturation.

Your due date is an estimate; only ~5% of babies arrive exactly on it. Always confirm with your obstetrician.

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